Fluorinated Cy7 compound and synthetic method and application thereof
阅读说明：本技术 一种氟化Cy7化合物及其合成方法和应用 (Fluorinated Cy7 compound and synthetic method and application thereof ) 是由 周欣 肖龙 陈世桢 李昱 叶朝辉 于 2021-09-22 设计创作，主要内容包括：本发明公开了一种氟化Cy7化合物及其合成方法和应用,所述的氟化Cy7化合物结构式如下：其合成方法如下：1、在氮气保护下,2-氟-5-硝基苯肼与3-甲基-2-丁酮发生环化反应,生成式(Ⅰ)化合物；2、在氮气保护下,式(Ⅰ)化合物和1,3-丙磺酸内酯发生亲和加成反应,生成式(Ⅱ)化合物；3、环己酮与三氯氧磷发生氧化反应,生成式(Ⅲ)化合物；4、在碱存在的条件下,式(Ⅱ)化合物和式(Ⅲ)化合物发生迈克尔加成反应,生成所述的氟化Cy7化合物。该化合物具有被动靶向能力,能够在肿瘤区域富集,且能在肿瘤过表达标志物的作用下被还原,生成新的化合物使得肿瘤区域通过～(19)F MRI和荧光成像的方法进行显影成像,从而实现肿瘤的诊断。(The invention discloses a fluorinated Cy7 compound, a synthesis method and application thereof, wherein the fluorinated Cy7 compound has the following structural formula: the synthesis method comprises the following steps: 1. under the protection of nitrogen, 2-fluoro-5-nitrophenylhydrazine and 3-methyl-2-butanone are subjected to cyclization reaction to generate a compound shown in a formula (I); 2. under the protection of nitrogen, carrying out affinity addition reaction on the compound shown in the formula (I) and 1, 3-propane sultone to generate a compound shown in the formula (II); 3. cyclohexanone and phosphorus oxychloride are subjected to oxidation reaction to generate a compound shown in a formula (III); 4. a compound of formula (II) and a compound of formula (III) in the presence of a baseThe compound undergoes a michael addition reaction to produce the fluorinated Cy7 compound. The compound has passive targeting ability, can be enriched in tumor region, and can be reduced under the action of tumor overexpression marker to generate new compound for allowing tumor region to pass through 19 F, carrying out imaging by using an MRI (magnetic resonance imaging) and fluorescence imaging method, thereby realizing the diagnosis of the tumor.)
1. A fluorinated Cy7 compound characterized by the following structural formula:
2. a method of synthesizing a fluorinated Cy7 compound according to claim 1, comprising the steps of:
2.1, under the protection of nitrogen, carrying out cyclization reaction on 2-fluoro-5-nitrophenylhydrazine and 3-methyl-2-butanone to generate a compound shown in a formula (I), wherein the reaction formula is as follows:
2.2, under the protection of nitrogen, carrying out affinity addition reaction on the compound shown in the formula (I) and 1, 3-propane sultone to generate a compound shown in the formula (II), wherein the reaction formula is as follows:
2.3, carrying out oxidation reaction on cyclohexanone and phosphorus oxychloride to generate a compound shown in a formula (III), wherein the reaction formula is as follows:
2.4 reacting the compound of formula (II) with the compound of formula (III) in the presence of a base to form said fluorinated Cy7 compound by the Michael addition reaction of the formula:
3. the method of synthesizing a fluorinated Cy7 compound according to claim 1, wherein: the temperature of the cyclization reaction is 95-110 ℃, and the time is 3-6 h.
4. The method of synthesizing a fluorinated Cy7 compound according to claim 1, wherein: the temperature of the affinity addition reaction is 110-120 ℃, and the time is 24-36 h.
5. The method of synthesizing a fluorinated Cy7 compound according to claim 1, wherein: the temperature of the oxidation reaction is 50-60 ℃, and the time is 6-10 h.
6. The method of synthesizing a fluorinated Cy7 compound according to claim 1, wherein: the temperature of the Michael addition reaction is 45-60 ℃, and the time is 3-6 h.
7. The method of synthesizing a fluorinated Cy7 compound according to claim 1, wherein: the alkali is anhydrous sodium acetate or cesium carbonate.
8. Use of a fluorinated Cy7 compound according to claim 1 for the preparation of a magnetic resonance imaging agent and a fluorescence imaging probe for the identification of nitroreductase.
9. Use of a fluorinated Cy7 compound according to claim 1, characterized in that: the fluorinated Cy7 compound can be used for preparing a bimodal developer for magnetic resonance imaging and fluorescence imaging.
Technical Field
The invention belongs to the technical field of magnetic resonance imaging, and particularly relates to a fluorinated Cy7 compound, and a synthesis method and application thereof.
Background
At present, imaging means are used to play an increasingly important role in early detection and treatment of diseases. Magnetic Resonance Imaging (MRI) has incomparable superiority and wide development prospect due to the advantages of no ionizing radiation, high tissue contrast, high time and spatial resolution and the like. The conventional MRI signal is usually from protons (mainly water and fat in the body), and thus has strong interference of background signal, so that heteronuclear MRI (such as heteronuclear MRI) is developed3He、19F、31P、129Xe) can improve imaging contrast.19Gyromagnetic ratio of F is only lower than1H, and the natural abundance is 100%, the response range is wide, and the like, so that the imaging sensitivity can be further improved. The sensitivity of fluorescence imaging (FLI) is usually in micromolar order, and the advantages of two imaging methods can be combined by combining magnetic resonance imaging and fluorescence imaging to obtain more imaging information.
Nitroreductase (NTR) is usually over-expressed in tumor tissues in an anoxic environment, so that the method has important clinical significance for the selective and efficient detection of NTR, and has important significance for the early discovery and early treatment of tumors by quickly and accurately identifying the NTR through a magnetic resonance and fluorescence method.
Disclosure of Invention
Based on the prior art, the invention provides a fluorinated Cy7 compound, a synthesis method and application thereof, the compound has passive targeting capability, can be enriched in a tumor region, and can be reduced under the action of tumor over-expressed markers of nitroreductase and reduced nicotinamide adenine dinucleotide to generate a new compound which can cause the chemical shift change of F and the change of fluorescence excitation wavelength, so that the tumor region passes through19F, carrying out imaging by using an MRI (magnetic resonance imaging) and fluorescence imaging method, thereby realizing the diagnosis of the tumor.
The compound has simple synthesis method and relatively low synthesis cost, and is suitable for large-scale production.
The technical scheme adopted for realizing the above purpose of the invention is as follows:
a fluorinated Cy7 compound having the formula:
a method of synthesizing a fluorinated Cy7 compound, comprising the steps of:
1. under the protection of nitrogen, 2-fluoro-5-nitrophenylhydrazine and 3-methyl-2-butanone are subjected to cyclization reaction to generate a compound shown in a formula (I), wherein the reaction formula is as follows:
2. under the protection of nitrogen, carrying out affinity addition reaction on the compound shown in the formula (I) and 1, 3-propane sultone to generate a compound shown in the formula (II), wherein the reaction formula is as follows:
3. cyclohexanone and phosphorus oxychloride are subjected to oxidation reaction to generate a compound shown in a formula (III), wherein the reaction formula is as follows:
4. reacting a compound of formula (II) with a compound of formula (III) in the presence of a base to form said fluorinated Cy7 compound by a Michael addition reaction of the formula:
further, the temperature of the cyclization reaction is 95-110 ℃, and the time is 3-6 h.
Furthermore, the temperature of the affinity addition reaction is 110-120 ℃, and the time is 24-36 h.
Further, the temperature of the oxidation reaction is 50-60 ℃, and the time is 6-10 h.
Further, the temperature of the Michael addition reaction is 45-60 ℃, and the time is 3-6 h.
Further, the alkali is anhydrous sodium acetate or cesium carbonate.
The application of a fluorinated Cy7 compound in preparing a magnetic resonance imaging agent and a fluorescence imaging probe for identifying nitroreductase.
Further, the fluorinated Cy7 compound can be used for preparing a bimodal developer for magnetic resonance imaging and fluorescence imaging.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the compound has passive targeting capability, can be enriched in a tumor region, has a longer blood circulation time, simultaneously carries out overexpression of Nitroreductase (NTR) and reduced Nicotinamide Adenine Dinucleotide (NADH) in a tumor environment, and has nitro (-NO) on the compound under the action of the NTR and the reduced Nicotinamide Adenine Dinucleotide (NADH)2) Is reduced to amino (-NH)2) Such a strongly electron-withdrawing group (-NO)2) Is reduced into a strong electron-donating group (-NH)2) Then the chemical shift change of F and the change of the maximum excitation wavelength of fluorescence can be caused by the transmission of a pi-pi conjugated structure, and the fluorescence imaging19The F MRI two imaging modes are visualized, and accurate diagnosis can be carried out on the tumor region.
2. After the fluorescence excitation wavelength of the compound is changed, the fluorescence excitation wavelength is in a near infrared region, so that the interference of background fluorescence signals is effectively reduced, the compound has deeper tissue penetration depth, and the sensitivity and accuracy of fluorescence imaging can be greatly improved.
3. The compound has good biological safety and good water dispersibility, is suitable for living MRI, and has good application prospect in the aspect of early diagnosis of tumors.
4. The compound has the advantages of simple preparation method, cheap and easily-obtained raw materials, relatively simple synthesis conditions, relatively low synthesis cost and high yield, and is suitable for large-scale production.
Drawings
Fig. 1 is an ultraviolet-visible absorption spectrum and a fluorescence emission spectrum of the fluorinated Cy7 compound prepared in example 1.
FIG. 2 is a graph comparing the fluorescence stability of the fluorinated Cy7 compound prepared in example 1, commercial Cy7 and commercial ICG.
FIG. 3 is a graph showing the change of fluorescence signal of the fluorinated Cy7 compound prepared in example 1 under the action of NTR and NADH.
FIG. 4 shows the effect of NTR and NADH on the fluorinated Cy7 compound prepared in example 119F NMR chart.
FIG. 5 is a graph showing the fluorescence image of the living tumor under the action of NTR and NADH of the fluorinated Cy7 compound prepared in example 1.
FIG. 6 shows the solution of fluorinated Cy7 compound prepared in example 1 under the action of NTR and NADH19F MRI change profile.
FIG. 7 shows the effect of NTR, NADH on living tumors of the fluorinated Cy7 compound prepared in example 119F MRI change profile.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
1. Synthesis of 2-fluoro-5-nitrophenylhydrazine
1.1, weighing 20g (128.0mmol, 1.0eq) of 2-fluoro-5-nitroaniline in a 500mL round-bottom flask, then adding 160mL12 mol/L concentrated hydrochloric acid into the round-bottom flask, stirring at room temperature for 30min, then transferring the round-bottom flask to a low-temperature reaction bath (-25 ℃) and continuing stirring for 10 min;
1.2 weighing NaNO210.6 g (153.6mmol, 1.2eq) was dissolved in 30mL of pure water to give NaNO2Dissolving NaNO in water by constant pressure dropping funnel2Dropwise adding the solution into a round-bottom flask, and continuing to react for 1h after dropwise adding is finished;
1.3, weighing 57.7g (255.7mmol, 2.0eq) of stannous chloride dihydrate, dissolving the stannous chloride dihydrate with 150mL of concentrated hydrochloric acid to obtain a stannous chloride hydrochloric acid solution, slowly dropwise adding the stannous chloride hydrochloric acid solution into a round-bottom flask, stirring for 10min after dropwise adding is finished, and transferring to room temperature to continue to react for 1 h;
1.4, filtering after the reaction is finished, washing a filter cake by concentrated hydrochloric acid, diethyl ether and dichloromethane in sequence, removing the solvent by using a rotary evaporator, dissolving the obtained solid by using methanol, filtering, retaining the filtrate, removing the solvent by using the rotary evaporator, and finally drying in a vacuum drying oven to obtain a yellow solid product (16.9g, the yield is 75.4%);
1H NMR(500MHz,MeOD)δ8.04(dd,J＝37.5,6.9Hz,2H),7.45(t,J＝9.6Hz,1H)；
19F NMR(471MHz,MeOD)δ-121.81(d,J＝10.4Hz)；
13C NMR(126MHz,MeOD)δ153.91(s),144.70(s),133.92(d,J＝13.2Hz),118.36(d,J＝8.8Hz),116.28(s),116.11(s),110.21(d,J＝4.0Hz),48.14(s),47.96(s),47.80(s),47.62(s),47.45(s),47.28(s),47.11(s)。
2. synthesis of Compounds of formula (I)
Weighing 14.15g (20mmol, 1.0eq) of the yellow solid product prepared in the step 1 and 3.45g (40mmol, 2.0eq) of 3-methyl-2-butanone into a 100mL round-bottom flask, adding 50mL of glacial acetic acid into the round-bottom flask, heating to 95 ℃ under the protection of nitrogen, reacting for 3 hours at 95 ℃, cooling to room temperature after the reaction is finished, adding CH into the round-bottom flask2Cl2Extracting, separating liquid and keeping organic phase, and using 1mol/L NaHCO to the organic phase3The aqueous solution was washed several times until no bubble was generated, the organic phase was separated and retained, the organic phase was distilled under reduced pressure, and the residue was purified by column chromatography (eluent: ethyl acetate: n-hexane: 1:20, v/v) to give a red oil (2.1g, yield 47.3%);
1H NMR(500MHz,MeOD)δ8.13(dd,J＝9.2,4.2Hz,1H),7.39(t,J＝9.0Hz,1H),2.40(s,3H),1.56(d,J＝2.0Hz,6H)；
19F NMR(471MHz,MeOD)δ-119.65(dd,J＝8.8,4.2Hz)；
13C NMR(126MHz,MeOD)δ192.98(s),157.62(s),143.04(s),142.29(s),123.58(d,J＝8.3Hz),116.16(s),115.99(s),58.26(d,J＝1.7Hz),18.56(s),14.18(s)。
3. synthesis of Compounds of formula (II)
Weighing 1.63g (7.2mmol, 1.0eq) of red oily matter obtained in the step 2 and 1.94g (15.8mmol, 2.2eq) of 1, 3-propane sultone into a 50mL round-bottom flask, adding 30mL of 1, 2-dichlorobenzene, heating to 110 ℃ under the protection of nitrogen, reacting at 110 ℃ overnight, cooling to room temperature after the reaction is finished, and adding CH2Cl2/H2Extracting with O, separating, retaining water phase, and adding CH2Cl2Washing for 3 times, removing solvent from the obtained liquid under reduced pressure, and purifying the residue by column chromatography (eluent: CH)3OH：CH2Cl21:8, v/v) to give a pale pink solid (1.2g, 48.4% yield);
1H NMR(500MHz,MeOD)δ8.52(dd,J＝9.3,3.7Hz,1H),7.80(d,J＝1.1Hz,1H),3.57(t,J＝6.3Hz,1H),3.08–2.98(m,2H),2.93(dd,J＝17.3,10.3Hz,1H),2.53–2.38(m,2H),2.11–2.02(m,1H),1.84(s,5H)；
19F NMR(471MHz,MeOD)δ-117.79(s)；
13C NMR(126MHz,MeOD)δ173.91(s),152.16(s),150.44(s),145.92(s),137.85(s),130.19(s),122.63(d,J＝8.9Hz),101.27(s),52.05(s),26.16(s),24.66(s)。
4. synthesis of Compound of formula (III)
50mL of anhydrous DMF was taken in a 150mL round-bottom flask, the round-bottom flask was placed in an ice-water bath, and POCl was slowly added to the round-bottom flask3(35mL, 380mmol, 3.0eq) and stirred for 30min, cyclohexanone (9.98g, 100mmol, 1.0eq) was added to the round-bottom flask with a syringe, the reaction was heated at 50 ℃ for 10h, after completion of the reaction, the mixture was cooled to room temperature, the mixture in the round-bottom flask was poured into 400g of ice, allowed to stand overnight, filtered, the filter cake was washed with pure water and then with dichloromethane several times, and the resulting solid was dried in a vacuum oven to give a yellow solid (7.74g, 45.8% yield).
1H NMR(500MHz,d6-DMSO)δ8.81(s,2H),2.36(t,J＝6.2Hz,4H),1.67–1.48(m,2H)；
13C NMR(126MHz,MeOD)δ150.65(s),148.69(s),141.75(d,J＝7.7Hz),139.03(d,J＝11.7Hz),120.80(d,J＝3.5Hz),112.88(s),111.37(s),111.19(s)。
5. Synthesis of fluorinated Cy7 Compounds
Weighing the light pink solid prepared in the step 3 (690mg, 2mmol, 2.0eq), the yellow solid prepared in the step 4 (191.4mg, 1.1mmol, 1.1eq) and anhydrous sodium acetate (88mg, 1.0eq) into a 100mL round-bottomed flask, adding 20mL acetic anhydride into the round-bottomed flask, heating to 60 ℃, reacting overnight, filtering after the reaction is finished, and using CH to filter a filter cake2Cl2Washing, purifying the obtained solid by column chromatography (eluent: CH)3OH：CH2Cl21:5, v/v) to give a greenish black, metallescent solid (416.5mg, 48.8% yield); weighing part of dark green solid with metallic luster, and dissolving the dark green solid with the metallic luster with PBS to prepare a solution to be detected with the concentration of 5 mu M for later use;
m/z＝823.17143；
1H NMR(500MHz,MeOD)δ8.59(d,J＝14.1Hz,2H),8.01(dd,J＝9.2,3.8Hz,2H),7.52(dd,J＝11.3,9.2Hz,2H),6.60(d,J＝14.1Hz,2H),4.65–4.48(m,4H),3.73(s,1H),2.99(t,J＝6.9Hz,4H),2.86(t,J＝6.0Hz,4H),2.43–2.29(m,4H),1.99(s,13H)；
19F NMR(471MHz,MeOD)δ-124.59(d,J＝9.6Hz)；
13C NMR(126MHz,MeOD)δ173.91(s),152.16(s),150.44(s),145.92(s),142.36(d,J＝2.7Hz),137.84(d,J＝3.0Hz),131.69(d,J＝8.3Hz),130.19(s),122.63(d,J＝8.9Hz),118.08(s),117.90(s),101.27(s),52.05(s),26.16(s),24.66(s),23.70(s)。
the fluorinated Cy7 compound prepared in example 1 was subjected to uv-vis absorption spectroscopy and fluorescence emission spectroscopy, 0.6mL of the solution to be detected was transferred to a microcuvette for uv-vis spectroscopy, and 2.5mL of the solution to be detected was transferred to a microcuvette for fluorescence spectroscopy, and the obtained uv-vis absorption spectra and uv-vis spectra are shown in fig. 1, and it can be seen from fig. 1 that the fluorinated Cy7 compound prepared in example 1 had a uv maximum absorption wavelength of 770nm and a fluorescence maximum emission wavelength of 794 nm.
First, fluorescence stability test of fluorinated Cy7 Compound of the present invention
The test method comprises the following steps:
the fluorinated Cy7 compound prepared in example 1 (labeled FCy 7-NO)2) Two 50 mM FCCy 7-NO groups were prepared by dissolving commercially available Cy7(CAS:943298-08-6) and commercially available ICG (CAS:3599-32-4) in PBS, respectively2Solution, 50mLCy7 solution and 50mLICG solution, FCy7-NO2The concentration of the solution, Cy7 solution and ICG solution were 5. mu.M, and one group was FCy7-NO2The solution, Cy7 solution and ICG solution were subjected to conventional conditions (room temperature, sunlight exposure), and another set of FCy7-NO2The solution, Cy7 solution and ICG solution were placed under UV irradiation, and the same volume (2.5mL) of FCy7-NO was taken at different time points for each condition2Solutions Cy7 and ICG were at respective maximum excitation wavelengths (FCy 7-NO)2770nm, 748nm for Cy7, 768nm for ICG) were measured;
and (3) test results:
the graph of the change of the fluorescence intensity of the fluorinated Cy7 compound prepared in example 1, the commercial Cy7 and the commercial ICG with time under different irradiation conditions is shown in fig. 2, and it can be seen from fig. 2 that the fluorescence intensity of the fluorinated Cy7 compound prepared in example 1 is reduced at the lowest rate with the increase of the irradiation time compared with the commercial Cy7 and the commercial ICG under both the sunlight irradiation condition and the ultraviolet lamp irradiation condition, thereby showing that the fluorinated Cy7 compound of the present invention has a halogen group (-F) introduced therein and has a symmetrical structure, and has better fluorescence stability than the commercial Cy7 and ICG.
Test II, fluorescence test of the fluorinated Cy7 compound of the invention under the action of tumor overexpression markers NTR and NADH
The test method comprises the following steps:
1.3mg of the fluorinated Cy7 compound prepared in example 1 (labeled FCy 7-NO) was weighed out2) Dissolved in 15mL of PBS to prepare 15mL of 0.1mM FCy7-NO2Solution, weighing 2.0mgNADH solidThe powder was dissolved in 15mL PBS to prepare 15mL of 0.2mM NADH solution, and NTR was dispersed to a solution of 5. mu.g/mL for use. Mixing 15mLFCy7-NO2Mixing the solution, 15mL NADH solution and 1mL LNTR solution, heating in a 37 ℃ water bath after uniformly mixing, sampling at different time points at intervals respectively, and measuring the change of the fluorescence intensity;
and (3) test results:
the fluorescence intensity of the fluorinated Cy7 compound prepared in example 1 with the action of NTR and NADH is shown in FIG. 3. it can be seen from FIG. 3 that the fluorescence intensity of the heated mixture gradually increases with the increase of the heating time, and the fluorescence signal is increased by about 8 times with respect to the initial (0min) after the completion of the reaction (1 h).
Experiment three, the fluorinated Cy7 compound of the invention is under the action of tumor overexpression markers NTR and NADH19F NMR test
The test method comprises the following steps:
13mg of the fluorinated Cy7 compound prepared in example 1 (labeled FCy 7-NO) was weighed out2) Dissolved in 15mL of PBS to prepare 15mL of 1mM FCy7-NO2Solution 20mg NADH solid powder was weighed and dissolved in 15mL PBS to prepare 15mL 2mM NADH solution, and NTR was dispersed to 5. mu.g/mL solution for use. Mixing 15mLFCy7-NO2Mixing the solution, 15ml NADH solution and 5ml LNTR solution, heating in a 37 ℃ water bath after uniformly mixing, sampling at different time points at intervals respectively, and measuring the change of an F spectrum;
and (3) test results:
the F spectrum of the fluorinated Cy7 compound prepared in example 1 under the action of NTR and NADH is shown in FIG. 4, and is shown in FIG. 4, FCy7-NO2The chemical shift of (A) is at-118.7 ppm, the substrate is gradually transformed into FCy7-NH under the action of NTR/NADH2Thereby causing a change in the chemical shift of F, FCy7-NH2The signal was at-123.9 ppm, and FCy7-NO2With a difference of 5.2 ppm.
Experiment IV, in-vivo fluorescence imaging experiment of the fluorinated Cy7 compound under the action of tumor overexpression markers NTR and NADH
The test method comprises the following steps:
weighing 1.3mg of example 1Fluorinated Cy7 Compound (labeled FCy 7-NO)2) Dissolved in 15mLPBS to prepare 15mL of 100. mu. MFCy7-NO2Solution 100 μ L of FCy7-NO was injected by tail vein injection into metastatic model mice (nude mice injected subcutaneously in the right hind leg with A549 cells, tumor formation after 2-3 weeks)2Preparing a solution, photographing tumor parts of the metastatic tumor model mice at different time points by using a visual camera, and measuring the change of the fluorescence intensity of the tumor parts;
and (3) test results:
FIG. 5 shows fluorescence intensity changes of the fluorinated Cy7 compound prepared in example 1 at tumor sites of a mouse model of metastatic tumors under the action of NTR and NADH in tumor regions, FCy7-NO2The contrast agent is already spread throughout the whole body of the nude mouse through blood circulation at the initial time of 0.1h until the tumor area begins to be enriched with the contrast agent at 2h, the fluorescence increases, but the background signals of other areas are also strong until the contrast effect of the fluorescence of the tumor area is optimal after 24 h.
Fifth, the solution of the fluorinated Cy7 compound of the present invention under the action of the tumor overexpression markers NTR and NADH19F MRI test
The test method comprises the following steps:
13mg of the fluorinated Cy7 compound prepared in example 1 (labeled FCy 7-NO) was weighed out2) Dissolved in 5mLPBS to prepare 15mL of 3mMFCy7-NO2Solution, 20mg NADH solid powder is weighed and dissolved in 5mL PBS to prepare 15mL6mM NADH solution, FCy7-NO is added2Mixing the solution and NADH solution, dividing into 5 parts of 2mL mixed solution, adding 5 parts of mixed solution into NTR solutions with concentrations of 0, 5, 10, 25 and 50 μ g/mL respectively, incubating in water bath at 37 ℃ for 1h respectively, and detecting FCy7-NH of target product by 9.4T nuclear magnetic imager respectively2Of the signal of (1).
And (3) test results:
fluorinated Cy7 compound prepared in example 1 reacts with NTR and NADH to generate FCy7-NO2Is/are as follows19The MRI signal (δ -118.7ppm) gradually decreased, the target product of the enzymatic reaction FCy7-NH2Is/are as follows19The F MRI signal (δ -123.9ppm) gradually increased, and of both signalsThe increase or decrease being substantially complementary, specification FCy7-NH2Is due to FCy7-NO2。
Sixthly, the fluorinated Cy7 compound of the invention is tested in vivo under the action of the markers NTR and NADH for tumor overexpression19F MRI test
The test method comprises the following steps:
13mg of the fluorinated Cy7 compound prepared in example 1 (labeled FCy 7-NO) was weighed out2) Dissolved in 1.5mL of PBS to prepare 5mL of 10mM MFCY7-NO2Solution, tumor-bearing mice (about 5X 10)6A549 cells (about 100. mu.L) were injected subcutaneously into the right hind leg of mice to form metastases after 2-3 weeks) and 100. mu.L of 10mM FCy7-NO was anesthetized with isoflurane2The solution was injected in situ into the tumor area of the mice and the target product FCy7-NH was detected by 9.4T NMR imaging2During which isoflurane anesthesia is maintained.
And (3) test results:
the fluorinated Cy7 compound prepared in example 1 reacts with NTR and NADH in the tumor area for about 30min to obtain FCy7-NO2Is/are as follows19Reduced fmri signal (δ -118.7ppm), target product FCy7-NH of the enzymatic reaction2Is/are as follows19F MRI signal (. delta. -. 123.9ppm) was present from absent to coincident with the tumor region, indicating FCy7-NO2Identification of NTR in the tumor region can be achieved in vivo.