阅读说明：本技术 一种安宫黄体酮的制备方法 (Preparation method of medroxyprogesterone ) 是由 王友富 王荣 邵振平 黄橙橙 王洪福 雷灵芝 于 2021-08-04 设计创作，主要内容包括：本发明涉及医药原料药制备技术领域,尤其涉及一种安宫黄体酮的制备方法。本发明所述制备方法是以17α-羟基黄体酮作为底物,依次进行亲核加成反应、环氧化反应、开环加成反应、消去反应、酯化反应和水解反应,得到所述安宫黄体酮,利用本发明所述的制备方法制备得到的安宫黄体酮的总收率≥91％。同时,在制备过程中不使用贵金属催化剂和致癌溶剂。(The invention relates to the technical field of preparation of pharmaceutical raw materials, in particular to a preparation method of medroxyprogesterone. The preparation method provided by the invention is characterized in that 17 alpha-hydroxyprogesterone is used as a substrate, and nucleophilic addition reaction, epoxidation reaction, ring-opening addition reaction, elimination reaction, esterification reaction and hydrolysis reaction are sequentially carried out to obtain the medroxyprogesterone, and the total yield of the medroxyprogesterone prepared by the preparation method provided by the invention is more than or equal to 91%. Meanwhile, no noble metal catalyst or carcinogenic solvent is used in the preparation process.)

1. A preparation method of medroxyprogesterone is characterized by comprising the following steps:

mixing 17 alpha-hydroxyprogesterone, orthoformate, a first acid catalyst, ethylene glycol and a first aprotic organic solvent, performing nucleophilic addition reaction, and adding a first base to obtain 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene; the first aprotic organic solvent is free of benzene-based solvents;

mixing the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene, hydrogen peroxide solution, a weakly basic catalyst, buffer salt and a second aprotic organic solvent, and carrying out epoxidation reaction to obtain 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregn;

mixing the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregnane, a Grignard reagent and tetrahydrofuran, carrying out ring-opening addition reaction, and adding a first acid solution to obtain 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregnane-3, 20-dione;

mixing the 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione, an alkali solution and a first alcohol organic solvent, and carrying out elimination reaction to obtain 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione;

mixing the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone, an acylating agent, a second acidic catalyst and a third aprotic organic solvent, performing esterification reaction, and adding a second base to obtain 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate; the third aprotic organic solvent is free of benzene-based solvents;

mixing the 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate, a second acid solution and a second glycol organic solvent, and performing hydrolysis reaction to obtain the anglerogestrel.

2. The method according to claim 1, wherein the orthoformate ester comprises trimethyl orthoformate and/or triethyl orthoformate;

the first acidic catalyst comprises p-toluenesulfonic acid;

the first aprotic organic solvent comprises dichloromethane and/or dichloroethane;

the first base comprises triethylamine and/or pyridine.

3. The process according to claim 1 or 2, characterized in that the molar ratio between 17 α -hydroxyprogesterone and orthoformate is 1: (2-5);

the mass ratio of the 17 alpha-hydroxyprogesterone to the first acidic catalyst is 1: (0.01 to 0.1);

the volume ratio of the mass of the 17 alpha-hydroxyprogesterone to the glycol is 1g: (0.5-10) mL;

the volume ratio of the mass of the 17 alpha-hydroxyprogesterone to the first base is 1g: (0.02-0.3) mL.

4. The process according to claim 1, wherein the weakly basic catalyst comprises one or more of trifluoroacetamide, trichloroacetamide, tribromoacetamide, chlorodifluoroacetamide and heptafluorobutanamide; or the weakly basic catalyst comprises trichloroacetonitrile and urea;

the buffer salt comprises one or more of carbonate, bicarbonate, acetate, propionate, monohydrogen phosphate, dihydrogen phosphate and borate;

the second aprotic organic solvent comprises one or more of dichloromethane, toluene, acetonitrile, trichloromethane and 1, 2-dichloroethane.

5. The production method according to claim 1 or 4, wherein the hydrogen peroxide solution has a mass concentration of 30%;

the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the hydrogen peroxide solution is 1g: (1-5) mL;

the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the buffer salt is 1: (0.5 to 1.5);

when the weakly basic catalyst comprises one or more of trifluoroacetamide, trichloroacetamide, tribromoacetamide, chlorodifluoroacetamide and heptafluorobutanamide, the mass ratio of the 17 alpha-hydroxy-3, 20-bis (ethylene glycol ketal-pregn-5-ene to the weakly basic catalyst is 1: (0.4 to 1.5);

when the weakly basic catalyst comprises trichloroacetonitrile and urea, the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the trichloroacetonitrile is 1: (0.4 to 1.5); the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the urea is 1: (0.4-1.5).

6. The method of claim 1, wherein the mass of the 5 α, 6 α -epoxy-17 α -hydroxy-3, 20-bisethylene ketal-pregna to volume ratio of the tetrahydrofuran is 1g: (1-5) mL;

the Grignard reagent is a tetrahydrofuran solution of methyl magnesium chloride; the concentration of the tetrahydrofuran solution of the methyl magnesium chloride is 3 mol/L;

the ratio of the mass of the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregnane to the volume of the grignard reagent is 1g: (0.8-8) mL;

the mass concentration of the first acid liquid is 10-50%; the first acid solution comprises one or more of hydrochloric acid, sulfuric acid and phosphoric acid;

the ratio of the mass of the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna to the volume of the first acid liquid is 1g: (1-10) mL.

7. The method according to claim 1, wherein the ratio of the mass of 5 α -hydroxy-6 β -methyl-17 α -hydroxy-pregna-3, 20-dione, the volume of the alkali solution and the volume of the first alcohol organic solvent is 1g: (2-5) mL: (3-10) mL;

the mass concentration of the alkali solution is 20-50%.

8. The process of claim 1, wherein the acylating agent comprises isopropenyl acetate;

the second acidic catalyst comprises p-toluenesulfonic acid;

the third aprotic organic solvent comprises one or more of dichloromethane, trichloromethane, tetrahydrofuran and acetonitrile;

the second base comprises triethylamine and/or pyridine.

9. The preparation method according to claim 1 or 8, wherein the ratio of the mass of the 4-pregnene-6 β -methyl-17 α -hydroxy-3, 20-dione, the volume of the acylating agent and the volume of the third aprotic organic solvent is 1g (0.5-5) mL (0-10) mL;

the mass ratio of the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone to the second acidic catalyst is 1 (0.05-0.3);

the mass ratio of the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone to the second alkali is 1g (0.1-1) mL.

10. The preparation method according to claim 1, wherein the mass concentration of the second acid solution is 10-50%; the second acid liquid comprises one or more of hydrochloric acid, sulfuric acid and phosphoric acid;

the ratio of the mass of the 3, 5-pregnadiene-6-methyl-3, 17 α -dihydroxy-20-one-3, 17-diacetate, the volume of the second acid solution and the volume of the second glycol organic solvent was 1g: (1-5) mL: (3-20) mL.

Technical Field

The invention relates to the technical field of preparation of pharmaceutical raw materials, in particular to a preparation method of medroxyprogesterone.

Background

The Angongprogesterone is mainly used for treating dysmenorrhea, functional amenorrhea, functional uterine bleeding, threatened abortion or habitual abortion, endometriosis, late breast cancer, endometrial adenocarcinoma, renal cancer, etc. Large doses can be used as long-acting contraceptive needles. In addition, the effect of the uterine apocrine factor is also reflected in that after the endometrium of the menstrual tidal factors loses the support of estrogen and progestogen and falls off, the estrogen or the progestogen, particularly the progestogen, can be continuously supplemented, so that the unrelieved endometrium is continuously supported, the continuous thickening level is kept, the endometrium firmly grows on the uterine wall, the preparation is made for implanting fertilized eggs, and the purpose of delaying the menstruation is realized.

The traditional preparation method of the medroxyprogesterone is that 17 alpha-hydroxy-progesterone acetate is used as a raw material, 6-methylene is obtained through 3-enol etherification and Mannich reaction, the 6-methylene is hydrogenated and reduced into methyl under the action of a palladium-carbon catalyst, and then the methyl is transposed into 6 alpha methyl under the action of hydrochloric acid, so that the medroxyprogesterone is obtained (the specific reaction flow is shown as formula 1):

the method has two disadvantages, one is that palladium carbon catalyst is used, the catalyst is expensive, the risk of fire, explosion and the like is high when in use, and the second is that the intrauterine progesterone produced by the process has very large impurities (6 alpha-methyl-3, 20-diketone-5 beta-pregna-17 acetate) which can not be removed by refining, and the total yield of the method is not more than 70%;

chinese patent publication No. CN102911233A discloses a method for preparing medroxyprogesterone, which uses 17 α -hydroxyprogesterone as a raw material, and obtains medroxyprogesterone through ketal formation, epoxidation, grignard reaction, hydrolysis, transposition and esterification (the specific reaction flow is shown in formula 2):

compared with the traditional method, the method has more reaction steps, peroxyacetic acid with strong pungent smell is used in the epoxidation reaction, the explosion risk exists, the transposition efficiency is not high when the 5 alpha hydroxyl is dehydrated to form 4,5 double bonds and 6-methyl transposition is carried out under the acidic condition, and the esterification reaction has more impurities, so that the method is not suitable for industrial production.

Disclosure of Invention

The invention aims to provide a preparation method of medroxyprogesterone, wherein the medroxyprogesterone prepared by the preparation method has higher yield; meanwhile, no noble metal catalyst is used in the preparation process.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a preparation method of medroxyprogesterone, which comprises the following steps:

mixing 17 alpha-hydroxyprogesterone, orthoformate, a first acid catalyst, ethylene glycol and a first aprotic organic solvent, performing nucleophilic addition reaction, and adding a first base to obtain 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene; the first aprotic organic solvent is free of benzene-based solvents;

mixing the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene, hydrogen peroxide solution, a weakly basic catalyst, buffer salt and a second aprotic organic solvent, and carrying out epoxidation reaction to obtain 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregn;

mixing the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregnane, a Grignard reagent and tetrahydrofuran, carrying out ring-opening addition reaction, and adding a first acid solution to obtain 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregnane-3, 20-dione;

mixing the 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione, an alkali solution and a first alcohol organic solvent, and carrying out elimination reaction to obtain 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione;

mixing the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone, an acylating agent, a second acidic catalyst and a third aprotic organic solvent, performing esterification reaction, and adding a second base to obtain 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate; the third aprotic organic solvent is free of benzene-based solvents;

mixing the 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate, a second acid solution and a second glycol organic solvent, and performing hydrolysis reaction to obtain the anglerogestrel.

Preferably, the orthoformate comprises trimethyl orthoformate and/or triethyl orthoformate;

the first acidic catalyst comprises p-toluenesulfonic acid;

the first aprotic organic solvent comprises dichloromethane and/or dichloroethane;

the first base comprises triethylamine and/or pyridine.

Preferably, the molar ratio of 17 α -hydroxyprogesterone to orthoformate is 1: (2-5);

the mass ratio of the 17 alpha-hydroxyprogesterone to the first acidic catalyst is 1: (0.01 to 0.1);

the volume ratio of the mass of the 17 alpha-hydroxyprogesterone to the glycol is 1g: (0.5-10) mL;

the volume ratio of the mass of the 17 alpha-hydroxyprogesterone to the first base is 1g: (0.02-0.3) mL.

Preferably, the weakly basic catalyst comprises one or more of trifluoroacetamide, trichloroacetamide, tribromoacetamide, chlorodifluoroacetamide and heptafluorobutanamide; or the weakly basic catalyst comprises trichloroacetonitrile and urea;

the buffer salt comprises one or more of carbonate, bicarbonate, acetate, propionate, monohydrogen phosphate, dihydrogen phosphate and borate;

the second aprotic organic solvent comprises one or more of dichloromethane, toluene, acetonitrile, trichloromethane and 1, 2-dichloroethane.

Preferably, the mass concentration of the hydrogen peroxide solution is 30%;

the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the hydrogen peroxide solution is 1g: (1-5) mL;

the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the buffer salt is 1: (0.5 to 1.5);

when the weakly basic catalyst comprises one or more of trifluoroacetamide, trichloroacetamide, tribromoacetamide, chlorodifluoroacetamide and heptafluorobutanamide, the mass ratio of the 17 alpha-hydroxy-3, 20-bis (ethylene glycol ketal-pregn-5-ene to the weakly basic catalyst is 1: (0.4 to 1.5);

when the weakly basic catalyst comprises trichloroacetonitrile and urea, the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the trichloroacetonitrile is 1: (0.4 to 1.5); the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the urea is 1: (0.4-1.5).

Preferably, the ratio of the mass of said 5 α, 6 α -epoxy-17 α -hydroxy-3, 20-bisethylene ketal-pregna to the volume of said tetrahydrofuran is 1g: (1-5) mL;

the Grignard reagent is a tetrahydrofuran solution of methyl magnesium chloride; the concentration of the tetrahydrofuran solution of the methyl magnesium chloride is 3 mol/L;

the ratio of the mass of the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregnane to the volume of the grignard reagent is 1g: (0.8-8) mL;

the mass concentration of the first acid liquid is 10-50%; the first acid solution comprises one or more of hydrochloric acid, sulfuric acid and phosphoric acid;

the ratio of the mass of the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna to the volume of the first acid liquid is 1g: (1-10) mL.

Preferably, the ratio of the mass of the 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione, the volume of the alkali solution and the volume of the first alcohol organic solvent is 1g: (2-5) mL: (3-10) mL;

the mass concentration of the alkali solution is 20-50%.

Preferably, the acylating agent comprises isopropenyl acetate;

the second acidic catalyst comprises p-toluenesulfonic acid;

the third aprotic organic solvent comprises one or more of dichloromethane, trichloromethane, tetrahydrofuran and acetonitrile;

the second base comprises triethylamine and/or pyridine.

Preferably, the ratio of the mass of 4-pregnene-6 β -methyl-17 α -hydroxy-3, 20-dione, the volume of the acylating agent and the volume of the third aprotic organic solvent is 1g: (0.5-5) mL: (0-10) mL;

the mass ratio of the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone to the second acidic catalyst is 1: (0.05 to 0.3);

the mass ratio of the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione to the second base is 1g: (0.1-1) mL.

Preferably, the mass concentration of the second acid liquid is 10-50%; the second acid liquid comprises one or more of hydrochloric acid, sulfuric acid and phosphoric acid;

the ratio of the mass of the 3, 5-pregnadiene-6-methyl-3, 17 α -dihydroxy-20-one-3, 17-diacetate, the volume of the second acid solution and the volume of the second glycol organic solvent was 1g: (1-5) mL: (3-20) mL.

The invention provides a preparation method of medroxyprogesterone, which comprises the following steps: mixing 17 alpha-hydroxyprogesterone, orthoformate, a first acid catalyst, ethylene glycol and a first aprotic organic solvent, performing nucleophilic addition reaction, and adding a first base to obtain 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene; mixing the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene, hydrogen peroxide solution, a weakly basic catalyst, buffer salt and a second aprotic organic solvent, and carrying out epoxidation reaction to obtain 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregn; mixing the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregnane, a Grignard reagent and tetrahydrofuran, carrying out ring-opening addition reaction, and adding a first acid solution to obtain 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregnane-3, 20-dione; mixing the 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione, an alkali solution and a first alcohol organic solvent, and carrying out elimination reaction to obtain 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione; mixing the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone, an acylating agent, a second acidic catalyst and a third aprotic organic solvent, performing esterification reaction, and adding a second base to obtain 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate; mixing the 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate, a second acid solution and a second glycol organic solvent, and performing hydrolysis reaction to obtain the anglerogestrel. According to the preparation method, carcinogens or dangerous reagents such as benzene solvents are avoided during epoxidation, alkaline conditions are used for dehydration in 5 alpha hydroxyl dehydration reaction, reaction selectivity is good, time is short, an acid catalyst is used in esterification reaction, 3-position and 17-position are reacted into ester, then 3-position ester is hydrolyzed to realize 6-position methyl transposition, and meanwhile 17-position hydroxyacetyl ester is retained, so that the angongprogesterone is obtained. In contrast to all previous processes, this route does not use the usual acidic conditions in the 5 α -hydroxy dehydration reaction, but uses a strongly basic inorganic base for dehydration, which does not convert the 6-methyl configuration, so the reaction time is greatly reduced and there are few side reaction products, in the esterification and methyl transposition steps, specifically designed to be carried out in two steps. The esterification reaction is catalyzed by selecting an acidic condition, the esterification reaction is carried out on the 3-position and the 17-position, then the hydrolysis of the ester at the 3-position selects the acidic hydrolysis, the 6-position methyl can be specifically converted into the 6 alpha configuration in the hydrolysis process, and the existence of the bis-acetylation impurities in the final product is eliminated. The total yield of the medroxyprogesterone prepared by the preparation method is more than or equal to 91 percent.

Drawings

FIG. 1 is an HPLC chromatogram of medroxyprogesterone prepared in example 1.

Detailed Description

The invention provides a preparation method of medroxyprogesterone, which comprises the following steps:

mixing 17 alpha-hydroxyprogesterone (1 in a formula 3), orthoformate, a first acid catalyst, ethylene glycol and a first aprotic organic solvent, performing nucleophilic addition reaction, and adding a first base to obtain 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene (2 in the formula 3); the first aprotic organic solvent is free of benzene-based solvents;

mixing the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene, a hydrogen peroxide solution, a weakly basic catalyst, a buffer salt and a second aprotic organic solvent, and carrying out an epoxidation reaction to obtain 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregn (3 in formula 3); the second aprotic organic solvent is free of benzene-based solvents;

mixing the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna, a Grignard reagent and tetrahydrofuran, carrying out ring-opening addition reaction, and adding a first acid solution to obtain 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione (formula 3 (4));

mixing the 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione, an alkali solution and a first alcohol organic solvent, and carrying out elimination reaction to obtain 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione (formula 3 (5));

mixing the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone, an acylating agent, a second acidic catalyst and a third aprotic organic solvent, performing esterification reaction, and adding a second base to obtain 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-one-3, 17-diacetate (formula (6) in formula 3); the third aprotic organic solvent is free of benzene-based solvents;

mixing the 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate, a second acid solution and a second glycol organic solvent, and performing hydrolysis reaction to obtain the anglerogestrel.

In the present invention, all the starting materials for the preparation are commercially available products known to those skilled in the art unless otherwise specified.

In the invention, the preparation process of the medroxyprogesterone is shown as a formula 3:

the method comprises the steps of mixing 17 alpha-hydroxyprogesterone (1 in a formula 3), orthoformate, a first acid catalyst, ethylene glycol and a first aprotic organic solvent, carrying out nucleophilic addition reaction, and adding a first base to obtain 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene (2 in the formula 3).

In the present invention, the orthoformate preferably includes trimethyl orthoformate and/or triethyl orthoformate; when the orthoformate comprises trimethyl orthoformate and triethyl orthoformate, the proportion of the trimethyl orthoformate and the triethyl orthoformate is not limited in any way, and the trimethyl orthoformate and the triethyl orthoformate can be mixed according to any proportion. In the present invention, the molar ratio of 17 α -hydroxyprogesterone to orthoformate is preferably 1: (2-5), more preferably 1: (3-4).

In the present invention, the first acidic catalyst preferably comprises p-toluenesulfonic acid; the p-toluenesulfonic acid is preferably p-toluenesulfonic acid monohydrate. In the present invention, the mass ratio of the 17 α -hydroxyprogesterone to the first acidic catalyst is preferably 1: (0.01 to 0.1), more preferably 1: (0.03-0.08), most preferably 1: (0.04-0.06).

In the present invention, the first aprotic organic solvent preferably comprises dichloromethane and/or dichloroethane; when the first aprotic organic solvent comprises dichloromethane and dichloroethane, the proportion of the dichloromethane and the dichloroethane is not limited in any way, and the dichloromethane and the dichloroethane can be mixed according to any proportion. In the present invention, the ratio of the mass of the 17 α -hydroxyprogesterone to the volume of the first aprotic organic solvent is preferably 1g: (0-10) mL, more preferably 1g: (2-7) mL, most preferably 1g: (3-5) mL.

In the present invention, the ratio of the mass of the 17 α -hydroxyprogesterone to the volume of ethylene glycol is preferably 1g: (0.5 to 10) mL, more preferably 1g: (1-8) mL, most preferably 1g: (4-6) mL.

In the present invention, the mixture of 17 α -hydroxyprogesterone, orthoformate, first acidic catalyst, ethylene glycol, and first aprotic organic solvent is preferably: mixing 17 alpha-hydroxyprogesterone and a first aprotic organic solvent in an inert atmosphere, and sequentially adding ethylene glycol, orthoformate and a first acid catalyst. The inert atmosphere is not particularly limited in the present invention, and those known to those skilled in the art can be used. In an embodiment of the present invention, the inert atmosphere is a helium atmosphere.

In the invention, the temperature of the nucleophilic addition reaction is preferably 20-40 ℃, and more preferably 35-40 ℃. The time of the nucleophilic addition reaction is not limited in any way, and the conversion rate of the nucleophilic addition reaction is determined to be more than 98% by a detection method well known to those skilled in the art.

In the present invention, the first base preferably comprises triethylamine and/or pyridine; when the first base comprises triethylamine and pyridine, the proportion of the triethylamine and the pyridine is not limited in any particular way, and the triethylamine and the pyridine can be mixed according to any proportion. In the present invention, the ratio of the mass of the 17 α -hydroxyprogesterone to the volume of the first base is preferably 1g: (0.02 to 0.3) mL, more preferably 1g: (0.06-0.21) mL, most preferably 1g: (0.14-0.17) mL.

After the process of adding the first alkali is finished, the method also preferably comprises the steps of concentration, elutriation, filtration and drying which are sequentially carried out; the concentration, elutriation, filtration and drying processes are not particularly limited in the present invention, and may be performed by processes well known to those skilled in the art.

After 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene is obtained, the invention mixes the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene, hydrogen peroxide solution, weak base catalyst, buffer salt and second aprotic organic solvent to carry out epoxidation reaction, and 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregn (3 in formula 3) is obtained.

In the present invention, the hydrogen peroxide solution preferably has a mass concentration of 30%; the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal pregn-5-ene to the volume of the hydrogen peroxide solution is preferably 1g: (1-5) mL, more preferably 1g: (2-4) mL, most preferably 1g: (2.5-3.5) mL.

In the invention, the weakly basic catalyst comprises one or more of trifluoroacetamide, trichloroacetamide, tribromoacetamide, chlorodifluoroacetamide and heptafluorobutanamide; when the weakly basic catalyst is more than two of the specific choices, the proportion of the specific substances is not limited in any way, and the specific substances are mixed according to any proportion. In the present invention, the mass ratio of the 17 α -hydroxy-3, 20-bisethylene ketal-pregn-5-ene and the weakly basic catalyst is preferably 1: (0.4 to 1.5), more preferably 1 (0.6 to 1.3), most preferably 1: (0.9-1.2).

Or the weakly basic catalyst preferably comprises trichloroacetonitrile and urea; in the present invention, the mass ratio of the 17 α -hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the trichloroacetonitrile is preferably 1: (0.4 to 1.5), more preferably 1 (0.6 to 1.3), most preferably 1: (0.9 to 1.2); the mass ratio of the 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene to the urea is 1: (0.4 to 1.5), more preferably 1 (0.6 to 1.3), most preferably 1: (0.9-1.2).

In the present invention, the buffer salt preferably includes one or more of carbonate, bicarbonate, acetate, propionate, monohydrogen phosphate, dihydrogen phosphate and borate; when the buffer salt is more than two of the specific choices, the invention has no special limitation on the proportion of the specific substances and can mix the specific substances according to any proportion; more preferably a dihydrogen phosphate salt. In the present invention, the mass ratio of the 17 α -hydroxy-3, 20-bisethylene ketal-pregn-5-ene and the buffer salt is preferably 1: (0.5 to 1.5), more preferably 1: (0.8 to 1.3).

In the present invention, the second aprotic organic solvent preferably comprises one or more of dichloromethane, toluene, acetonitrile, chloroform and 1, 2-dichloroethane; when the second aprotic organic solvent is more than two of the specific choices, the specific proportion of the specific substances is not limited in any way, and the specific substances are mixed according to any proportion; more preferably dichloromethane. In the present invention, the ratio of the mass of the 17 α -hydroxy-3, 20-bisethylene ketal pregn-5-ene to the volume of the second aprotic organic solvent is preferably 1g: (5-20) mL, more preferably 1g: (7-18) mL, most preferably 1g: (10-13) mL.

In the present invention, it is preferable that the 17 α -hydroxy-3, 20-bisethylene ketal-pregn-5-ene, the hydrogen peroxide solution, the weakly basic catalyst, the buffer salt and the second aprotic organic solvent are mixed by mixing the 17 α -hydroxy-3, 20-bisethylene ketal-pregn-5-ene and the second aprotic organic solvent, and then sequentially adding the buffer salt, the weakly basic catalyst and the hydrogen peroxide solution. The adding mode of the invention is not limited in any way, and the adding mode can be added by adopting a mode which is well known to a person skilled in the art.

In the invention, the temperature of the epoxidation reaction is preferably 0-80 ℃, and more preferably 10-20 ℃. The present invention does not have any particular limitation on the time of the epoxidation reaction, and the conversion rate of the epoxidation reaction is determined to be more than 98% by using a detection method well known to those skilled in the art. In the present invention, the epoxidation reaction is preferably carried out under stirring conditions, and the stirring conditions are not particularly limited in the present invention, and may be carried out by a process well known to those skilled in the art.

After the epoxidation reaction is completed, the present invention also preferably includes a process of adding a sodium sulfite solution to a product system obtained by the epoxidation reaction to remove hydrogen peroxide. The invention has no special limitation on the concentration and the addition of the sodium sulfite solution, and can ensure that the hydrogen peroxide is completely removed.

After the hydrogen peroxide is completely removed, the method also preferably comprises the steps of concentration, elutriation, filtration and drying which are sequentially carried out; the concentration, elutriation, filtration and drying processes are not particularly limited in the present invention, and may be performed by processes well known to those skilled in the art.

After the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregnane is obtained, the 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregnane, a Grignard reagent and tetrahydrofuran are mixed for ring-opening addition reaction, and a first acid solution is added to obtain the 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregnane-3, 20-dione.

In the present invention, the grignard reagent is preferably a tetrahydrofuran solution of methyl magnesium chloride; the concentration of the tetrahydrofuran solution of the methyl magnesium chloride is preferably 3 mol/L; the ratio of the mass of said 5 α, 6 α -epoxy-17 α -hydroxy-3, 20-bisethylene ketal-pregna to the volume of said grignard reagent is preferably 1g: (0.8 to 8) mL, more preferably 1g: (2-6) mL, most preferably 1g: (3-5) mL.

In the present invention, the ratio of the mass of said 5 α, 6 α -epoxy-17 α -hydroxy-3, 20-bisethylene ketal-pregna to the volume of said tetrahydrofuran is preferably 1g: (1-5) mL, more preferably 1g: (3-4) mL.

In the present invention, the mixture of the 5 α, 6 α -epoxy-17 α -hydroxy-3, 20-bisethylene ketal-pregna, the grignard reagent and the tetrahydrofuran is preferably prepared by mixing the 5 α, 6 α -epoxy-17 α -hydroxy-3, 20-bisethylene ketal-pregna and the tetrahydrofuran in an inert atmosphere and adding the grignard reagent.

In the present invention, the ring-opening addition reaction is preferably carried out under reflux conditions; the invention has no special limit on the temperature of the ring-opening addition reaction, and can ensure the realization of a reflux state. The invention does not have any special limitation on the time of the ring-opening addition reaction, and the conversion rate of the ring-opening addition reaction is determined to reach more than 98% by adopting a detection method well known to a person skilled in the art.

After the ring-opening addition reaction is completed, the present invention also preferably includes cooling; the cooling process is not particularly limited in the present invention, and the cooling process may be carried out to room temperature by a process known to those skilled in the art.

In the present invention, the mass concentration of the first acid solution is preferably 10 to 50%, more preferably 15 to 40%, and most preferably 20 to 36%. In the invention, the first acid solution preferably comprises one or more of hydrochloric acid, sulfuric acid and phosphoric acid; when the first acid solution is more than two of the specific choices, the proportion of the specific substances is not limited in any way, and the specific substances are mixed according to any proportion.

In the present invention, the ratio of the mass of the 5 α, 6 α -epoxy-17 α -hydroxy-3, 20-bisethylene ketal-pregna to the volume of the first acid liquid is preferably 1g: (1-10) mL, more preferably 1g: (2-8) mL, most preferably 1g: (3-6) mL.

In the invention, after the first acid solution is added, stirring is preferably performed at 5-40 ℃, and the stirring process is not particularly limited, and can be performed by a process known to those skilled in the art.

In the present invention, after the stirring is completed, the method further preferably comprises sequentially performing concentration, elutriation and drying; the concentration, elutriation and drying processes are not limited in any way by the present invention, and can be performed by processes well known to those skilled in the art.

After 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione is obtained, the invention mixes the 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione, alkali solution and a first alcohol organic solvent, and carries out elimination reaction to obtain 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione.

In the invention, the mass concentration of the alkali solution is preferably 20-50%, more preferably 25-45%, and most preferably 30-40%. In the present invention, the alkali solution is preferably a sodium hydroxide solution or a potassium hydroxide solution, and more preferably a sodium hydroxide solution. In the present invention, the ratio of the mass of the 5 α -hydroxy-6 β -methyl-17 α -hydroxy-pregna-3, 20-dione to the volume of the alkali solution is preferably 1g: (2-5) mL, more preferably 1g: (3-4) mL. In the present invention, the alkali solution can greatly shorten the reaction time while ensuring that almost no by-products are produced.

In the present invention, the first alcohol organic solvent preferably includes one or more of methanol, ethanol and isopropanol; when the first alcohol organic solvent is more than two of the specific choices, the specific proportion of the specific substances is not limited in any way, and the specific substances are mixed according to any proportion; more preferably methanol. In the present invention, the ratio of the mass of 5 α -hydroxy-6 β -methyl-17 α -hydroxy-pregna-3, 20-dione to the volume of the first alcohol organic solvent is preferably 1g: (3-10) mL, more preferably 1g: (4-8) mL, most preferably 1g: (5-6) mL.

In the present invention, the mixing is preferably performed in an inert atmosphere, which is preferably a helium atmosphere. The mixing process is not particularly limited, and may be performed by a method known to those skilled in the art.

In the invention, the temperature of the elimination reaction is preferably 50-83 ℃, and more preferably 60-65 ℃. The time of the elimination reaction is not limited in any way, and the conversion rate of the elimination reaction is determined to be more than 98% by a detection method well known to those skilled in the art. In the present invention, the elimination reaction is preferably carried out under stirring, and the stirring process is not particularly limited, and may be carried out by a process known to those skilled in the art.

After the elimination reaction is completed, the invention also preferably comprises a process of adding glacial acetic acid into a product system obtained by the elimination reaction; the amount of glacial acetic acid used in the present invention is not particularly limited, and it is sufficient to use the amount known to those skilled in the art and ensure that the purpose of neutralizing the product system is achieved.

After the neutralization is finished, the method also preferably comprises the steps of concentration, elutriation, filtration and drying which are sequentially carried out; the concentration, elutriation, filtration and drying processes are not particularly limited in the present invention, and may be performed by processes well known to those skilled in the art.

After 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione is obtained, the invention mixes the 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione, acylating reagent, second acid catalyst and third aprotic organic solvent, and carries out esterification reaction, and second alkali is added to obtain 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate.

In the present invention, the acylating agent preferably comprises isopropenyl acetate; the ratio of the mass of 4-pregnene-6 β -methyl-17 α -hydroxy-3, 20-dione to the volume of the acylating agent is preferably 1g: (0.5 to 5) mL, more preferably 1g: (1-4) mL, most preferably 1g: (2-3) mL.

In the present invention, the second acidic catalyst preferably includes p-toluenesulfonic acid; the p-toluenesulfonic acid is preferably p-toluenesulfonic acid monohydrate. In the present invention, the mass ratio of the 4-pregnene-6 β -methyl-17 α -hydroxy-3, 20-dione to the second acidic catalyst is preferably 1: (0.05 to 0.3), more preferably 1: (0.1-0.2).

In the invention, the third aprotic organic solvent comprises one or more of dichloromethane, trichloromethane, tetrahydrofuran and acetonitrile; when the third aprotic organic solvent is more than two of the specific choices, the specific proportion of the specific substances is not limited in any way, and the third aprotic organic solvent can be mixed according to any proportion; more preferably dichloromethane. In the present invention, the ratio of the mass of the 4-pregnene-6 β -methyl-17 α -hydroxy-3, 20-dione to the volume of the third aprotic organic solvent is preferably 1g: (0-10) mL, more preferably 1g: (2-7) mL, most preferably 1g: (3-6) mL.

In the present invention, the mixture of the 4-pregnene-6 β -methyl-17 α -hydroxy-3, 20-dione, the acylating agent, the second acidic catalyst and the third aprotic organic solvent is preferably prepared by mixing the 4-pregnene-6 β -methyl-17 α -hydroxy-3, 20-dione and the third aprotic organic solvent in an inert atmosphere, and then sequentially adding the acylating agent and the second acidic catalyst. The process of the present invention is not particularly limited, and may be carried out by a process known to those skilled in the art. In the present invention, the inert atmosphere is preferably a helium atmosphere.

In the invention, the temperature of the esterification reaction is preferably 30-94 ℃, and more preferably 50-60 ℃. The time of the esterification reaction is not limited in any way, and the conversion rate of the esterification reaction is determined to be more than 98% by adopting a detection method well known to a person skilled in the art.

In the invention, the isopropenyl acetate is used as an acylating reagent, so that the reaction time can be further shortened, the generation of impurities can be reduced, and the reaction degree is the most complete.

In the present invention, the second base preferably comprises triethylamine and/or pyridine; when the second base comprises triethylamine and pyridine, the proportion of the triethylamine and the pyridine is not limited in any special way, and the triethylamine and the pyridine can be mixed according to any proportion. In the present invention, the ratio of the mass of the 4-pregnene-6 β -methyl-17 α -hydroxy-3, 20-dione to the volume of the second base is preferably 1g: (0.1-1) mL, more preferably 1g: (0.2-0.7) mL, most preferably 1g: (0.5-0.6) mL.

After the process of adding the second base is finished, the invention also preferably comprises the steps of decompression concentration, adding an alcohol organic solvent, concentration crystallization and filtration which are sequentially carried out; the concentration, concentration crystallization and filtration process of the present invention is not particularly limited, and may be carried out by a process known to those skilled in the art. In the present invention, the kind of the alcohol organic solvent preferably refers to the limitation of the kind of the first alcohol organic solvent in the above technical solution, and is not described herein again.

In the present invention, the 3, 5-pregnadiene-6-methyl-3, 17 α -dihydroxy-20-one-3, 17-diacetate prepared by the above process is preferably a wet product of 3, 5-pregnadiene-6-methyl-3, 17 α -dihydroxy-20-one-3, 17-diacetate.

After 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate is obtained, the 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate, a second acid solution and a second glycol organic solvent are mixed and subjected to hydrolysis reaction to obtain the angongopuncterone.

In the present invention, the mass concentration of the second acid solution is preferably 10 to 50%, more preferably 15 to 40%, and most preferably 20 to 36%. In the invention, the second acid solution preferably comprises one or more of hydrochloric acid, sulfuric acid and phosphoric acid; when the second acid solution is more than two of the specific choices, the proportion of the specific substances is not limited in any way, and the specific substances are mixed according to any proportion. In the present invention, the ratio of the mass of the 3, 5-pregnadiene-6-methyl-3, 17 α -dihydroxy-20-one-3, 17-diacetate to the volume of the second acid solution is preferably 1g: (1-5) mL, more preferably 1g: (2-3) mL.

In the present invention, the second glycol-based organic solvent preferably includes one or more of methanol, ethanol and isopropanol; when the second glycol organic solvent is more than two of the specific choices, the invention does not have any special limitation on the proportion of the specific substances, and the specific substances can be mixed according to any proportion; more preferably methanol. In the present invention, the ratio of the mass of the 3, 5-pregnadiene-6-methyl-3, 17 α -dihydroxy-20-one-3, 17-diacetate to the volume of the third alcohol-based organic solvent is preferably 1g: (3-20) mL, more preferably 1g: (8-13) mL.

In the invention, the temperature of the hydrolysis reaction is preferably 50-83 ℃, and more preferably 60-70 ℃. The time of the hydrolysis reaction is not limited in any way, and the conversion rate of the hydrolysis reaction is determined to be more than 98% by a detection method well known to a person skilled in the art.

In the invention, in addition to the selective hydrolysis of the 3-position ester, the 6-position methyl group is converted into a 6 beta configuration in the hydrolysis process, so that the existence of the bis-acetylation impurities in the final product in the prior art is eliminated.

After the hydrolysis reaction is finished, the method also preferably comprises the steps of elutriation, filtration and refining which are sequentially carried out; the process of the present invention for the water separation and filtration is not particularly limited, and may be performed by a process known to those skilled in the art. In the present invention, the purification preferably employs a second glycol-based organic solvent; the present invention does not have any particular limitation on the specific process of the refining, and the refining may be performed by a process known to those skilled in the art.

The following examples are provided to illustrate the preparation of medroxyprogesterone according to the present invention, but should not be construed as limiting the scope of the present invention.

Example 1

Mixing 50g of 17 alpha-hydroxyprogesterone and 250mL of ethylene glycol in a nitrogen atmosphere, adding 33.1mL of trimethyl orthoformate and 0.5g of p-toluenesulfonic acid monohydrate, keeping the temperature at 20 ℃ for reaction, adding 1mL of triethylamine after the reaction is finished, and sequentially concentrating, elutriating, filtering and drying. To obtain 61.8g of 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene with a yield of 123.6%.

Mixing 60g of 17 alpha-hydroxy-3, 20-bisglycol ketal-pregn-5-ene and 300mL of toluene, adding 30g of sodium carbonate, 24g of trifluoroacetamide and 60mL of hydrogen peroxide solution with the mass concentration of 30%, reacting completely at 80 ℃ under stirring, adding sodium sulfite solution to neutralize the oxidation of hydrogen peroxide after the reaction is completed, and sequentially carrying out concentration, elutriation, filtration and drying to obtain 61.5g of 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisglycol ketal-pregn with the yield of 102.5%.

Mixing 60g of 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna with 60mL of tetrahydrofuran in a nitrogen atmosphere, adding 48mL of tetrahydrofuran solution of methyl magnesium chloride with the concentration of 3mol/L, refluxing, cooling to room temperature after the reaction is finished to obtain 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna solution, adding 180mL of hydrochloric acid solution with the mass concentration of 10%, stirring for reaction at 20 ℃, concentrating, elutriating and drying sequentially after the reaction is finished to obtain 48.1g of 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione with the yield of 80.2%.

Adding 45g of 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione into 135mL of methanol and 90mL of 25% sodium hydroxide aqueous solution, stirring at 60 ℃ for reaction, neutralizing with glacial acetic acid after the reaction is finished, and sequentially concentrating, elutriating, filtering and drying to obtain 42.5g of 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione with the yield of 94.4%.

In the nitrogen atmosphere, 40g of 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione, 120mL of dichloromethane, 200mL of isopropenyl acetate and 2g of p-toluenesulfonic acid monohydrate are mixed, the temperature is kept at 30 ℃, 4mL of triethylamine is added after the reaction is finished, and the solvent is concentrated under reduced pressure, methanol is added, concentrated, crystallized and filtered sequentially to obtain the wet product of 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-one-3, 17-diacetate.

Adding 120mL of methanol and 120mL of diluted hydrochloric acid with the mass concentration of 20% into the wet product of the 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate, preserving the temperature at 50 ℃, and after the reaction is finished, sequentially performing elutriation, filtration and refining by using methanol to obtain 40.5g of angongprogesterone, wherein the yield is 101.3%, and the total yield relative to the starting materials is 97.2%; as can be seen from FIG. 1 (the peak of the spectrum shown in FIG. 1 is shown in Table 1), the HPLC content of medroxyprogesterone is 99.7%;

table 1 peaks in the spectrum shown in figure 1

Peak number	Retention time	Area of	Height	Area%	Theoretical plate number (USP)	Degree of separation (USP)
							1	32.039	3280	167	0.017	59730	--
2	34.880	19059659	985148	99.685	74488	5.485
							3	37.436	5589	319	0.029	98151	5.168
4	38.818	13416	502	0.070	48223	2.334
							5	40.127	6103	349	0.032	114163	2.215
6	44.846	10944	621	0.057	165762	10.307
							7	46.664	2024	168	0.011	306900	4.676
8	48.563	7808	554	0.041	343791	5.685
							9	51.442	2516	270	0.013	665688	9.868
10	52.469	3920	407	0.021	616565	3.952
							11	53.040	4565	455	0.024	604028	2.115
Total of		19119824	988962	100.000

。

Example 2

In a helium atmosphere, mixing 50g of 17 alpha-hydroxyprogesterone and 500mL of dichloromethane, adding 25mL of ethylene glycol, 75mL of triethyl orthoformate and 5g of p-toluenesulfonic acid, preserving heat at 30 ℃ for reaction, adding 15mL of triethylamine after the reaction is finished, and sequentially concentrating, elutriating, filtering and drying to obtain 61.9g of 17 alpha-hydroxy-3, 20-bisglycol ketal-pregn-5-ene with the yield of 123.8%.

Mixing 60g of 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene and 600mL of dichloromethane, adding 60g of monopotassium phosphate, 60g of trichloroacetamide and 180mL of hydrogen peroxide solution with the mass concentration of 30%, reacting completely at 20 ℃ under stirring, adding sodium sulfite solution to neutralize the oxidation of hydrogen peroxide after the reaction is completed, and sequentially concentrating, elutriating, filtering and drying to obtain 62.0g of 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregn with the yield of 103.3%.

In a helium atmosphere, 60g of 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna and 180mL of tetrahydrofuran are mixed, 300mL of tetrahydrofuran solution of methyl magnesium chloride with the concentration of 3mol/L is added, reflux reaction is carried out, the temperature is reduced to room temperature after the reaction is finished, 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna solution is obtained, 600mL of sulfuric acid solution with the mass concentration of 20% is added, stirring reaction is carried out at the temperature of 5 ℃, concentration, elutriation and drying are sequentially carried out after the reaction is finished, 47.9g of 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione is obtained, and the yield is 79.8%.

Adding 315mL of ethanol and 135mL of 50% sodium hydroxide aqueous solution into 45g of 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione, stirring and reacting at 50 ℃, and after the reaction is finished, sequentially adopting glacial acetic acid for neutralization, concentration, elutriation, filtration and drying to obtain 42.1g of 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-dione with the yield of 93.6%.

In helium atmosphere, adding 400mL of tetrahydrofuran, 20mL of isopropenyl acetate and 4g of p-toluenesulfonic acid into 40g of 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone, keeping the temperature at 60 ℃, adding 20mL of pyridine after the reaction is finished, and sequentially carrying out reduced pressure concentration on a solvent, adding ethanol, concentration crystallization and filtration to obtain a wet product of 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate.

Adding 400mL of ethanol and 40mL of dilute sulfuric acid with the mass concentration of 50% into the wet product of the 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate, and after the reflux reaction is finished, sequentially performing elutriation, filtration and refining by using ethanol to obtain 38.3g of anglergesterone, wherein the yield is 95.8%, the total yield is 91.5% relative to the initial material, and the HPLC content is 99.5%.

Example 3

In argon atmosphere, after mixing 50g of 17 alpha-hydroxyprogesterone and 250mL of dichloromethane, adding 500mL of ethylene glycol, 82.8mL of trimethyl orthoformate and 2.5g of p-toluenesulfonic acid monohydrate, keeping the temperature at 40 ℃ for reaction, after the reaction is finished, adding 10mL of pyridine, concentrating, elutriating, filtering and drying to obtain 62.4g of 17 alpha-hydroxy-3, 20-diethylene glycol ketal-pregn-5-ene with the yield of 124.8%.

Mixing 60g of 17 alpha-hydroxy-3, 20-bisethylene ketal-pregn-5-ene and 1200mL of acetonitrile, adding 90g of dipotassium hydrogen phosphate, 90g of tribromoacetamide and 300mL of hydrogen peroxide solution with the mass concentration of 30%, stirring at 0 ℃ to react completely, after the reaction is finished, adding sodium sulfite solution to neutralize the oxidation of hydrogen peroxide, and then sequentially concentrating, elutriating, filtering and drying to obtain 61.7g of 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregn with the yield of 102.8%.

In argon atmosphere, 60g of 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna and 300mL of tetrahydrofuran are mixed, 480mL of tetrahydrofuran solution of methyl magnesium chloride with the concentration of 3mol/L is added, reflux reaction is carried out, the temperature is reduced to room temperature after the reaction is finished, 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna solution is obtained, 60mL of phosphoric acid solution with the mass concentration of 50% is added, stirring reaction is carried out at 40 ℃, and after the reaction is finished, concentration, elutriation and drying are carried out in sequence, 48.2g of 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-dione is obtained, and the yield is 80.3%.

Adding 450mL of isopropanol and 225mL of potassium hydroxide aqueous solution with the mass concentration of 20% into 45g of 5 alpha-hydroxy-6 beta-methyl-17 alpha-hydroxy-pregna-3, 20-diketone, refluxing, stirring and reacting, neutralizing with glacial acetic acid after the reaction is finished, and sequentially concentrating, elutriating, filtering and drying to obtain 42.2g of 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone with the yield of 93.8%.

Adding 80mL of isopropenyl acetate and 12g of p-toluenesulfonic acid into 40g of 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone in argon atmosphere, carrying out reflux reaction, adding 40mL of pyridine after the reaction is finished, and sequentially carrying out reduced pressure concentration on a solvent, adding isopropanol, concentration crystallization and filtration to obtain a wet product of 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate.

Adding 800mL of isopropanol and 200mL of diluted phosphoric acid with the mass concentration of 10% into the wet product of the 3, 5-pregnadiene-6-methyl-3, 17 alpha-dihydroxy-20-ketone-3, 17-diacetate, and after the reflux reaction is finished, sequentially performing elutriation, filtration and refining by using isopropanol to obtain 38.6g of angongprogesterone, wherein the yield is 96.5%, the total yield relative to the starting materials is 93.3%, and the HPLC content is 99.6%.

Comparative example 1

Synthesis of 5 α, 6 α -epoxy-17 α -hydroxy-3, 20-bisethylene ketal-pregna:

putting 58g of 17 alpha-hydroxy-3, 20-diethylene glycol ketal-pregn-5-ene into 580g of trichloromethane, adding 58g of anhydrous sodium carbonate and 52.2g of anhydrous sodium sulfate, stirring and mixing uniformly, dropwise adding a peracetic acid solution of anhydrous sodium acetate into the system in 20 minutes at a temperature of 20 ℃, keeping the temperature for reaction for 3.5 hours, standing for 9 hours, wherein the peracetic acid solution of anhydrous sodium acetate is prepared by uniformly mixing 156.6g of a 25% mass percent peracetic acid aqueous solution and 15.66g of anhydrous sodium acetate, filtering the reaction system after standing to obtain a filter cake and a filtrate, washing the filter cake with trichloromethane, mixing a washing solution with the filtrate to obtain a combined solution, washing the combined solution with a 5% mass percent sodium bicarbonate solution, washing with water to be neutral, and dehydrating with anhydrous sodium sulfate, filtering, concentrating the filtrate under reduced pressure to separate out crystal, freezing, standing for 9 hours, washing filter cake with ethanol, and drying to obtain 61.5g of 5 alpha, 6 alpha-epoxy-17 alpha-hydroxy-3, 20-bisethylene ketal-pregna with yield of 82.9% and purity of 88.1%.

Comparative example 2

Synthesis of 9,11 α -epoxy-17 α -hydroxy-3-oxopregn-4-ene-7 α, 21-dicarboxylic acid methyl ester, γ -lactone:

adding 5.4g of 17 alpha-hydroxy-3-oxopregna-4, 9(11) -diene-7 alpha, 21-dicarboxylic acid methyl hydrogen ester and gamma-lactone (purity 99.0%), adding 4.9g of trichloroacetamide, 3.5g of dipotassium hydrogen phosphate, adding 50mL of dichloromethane, cooling to 15 ℃, dropwise adding 25g of 30% aqueous hydrogen peroxide solution after 10 minutes, heating to 20 ℃, stirring and reacting for 6 hours, adding 100mL of water into the reaction solution, standing and layering, adding 50mL of 0.5N sodium hydroxide solution into the separated dichloromethane layer, stirring, standing and layering, extracting the water layer with dichloromethane, combining the separated dichloromethane layer, adding 50mL of 0.5N hydrochloric acid solution into the dichloromethane layer, stirring, standing and layering, adding 50mL of saturated saline solution into the separated dichloromethane layer, washing, drying the dichloromethane layer with anhydrous magnesium sulfate, removing solvent, 5.5g of a solid was obtained with a purity of 81.6%.

Comparative example 3

Synthesis of medroxyprogesterone

Under the protection of nitrogen, adding 360g of acetic acid, 60g of acetic anhydride and 1.5g of sulfosalicylic acid into 30g of 4-pregnene-6 beta-methyl-17 alpha-hydroxy-3, 20-diketone, uniformly stirring, heating to 100-120 ℃, refluxing for 3 hours, cooling to below 25 ℃, adding 1500mL of water into a reaction system, standing for 4 hours, filtering, and drying a filter cake at 80 ℃ to obtain 32.2g of angongopuncterone with the purity of 34.1%.

Therefore, the medroxyprogesterone prepared by the preparation method has higher yield.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.