CN114835698B - (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine and preparation method thereof - Google Patents

(diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine and preparation method thereof Download PDF

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CN114835698B
CN114835698B CN202210567064.4A CN202210567064A CN114835698B CN 114835698 B CN114835698 B CN 114835698B CN 202210567064 A CN202210567064 A CN 202210567064A CN 114835698 B CN114835698 B CN 114835698B
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furan
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王石发
秦阿慧
巩帅
张燕
王忠龙
李明新
杨益琴
徐徐
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Nanjing Forestry University
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Abstract

The invention discloses a (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine and a preparation method thereof. The invention uses 4-bromo-2-hydroxy acetophenone as raw material, and carries out coupling reaction with 4- (diphenylamino) phenylboronic acid to obtain 4- (diphenylamino) phenyl-2-hydroxy acetophenone, and then carries out aldol condensation and cyclization reaction with furfural to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone; then carrying out esterification reaction with acryloyl chloride to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone acrylate. The compound can react with cysteine rapidly and exclusively at room temperature to change the fluorescent color of the solution from colorless to orange red, and the minimum detection limit is 9.76X10 ‑8 M. The probe can be used as a fluorescent probe for detecting cysteine and has good application prospect.

Description

(diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine and preparation method thereof
Technical Field
The invention belongs to the technical field of fine organic synthesis, and relates to a (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine and a preparation method thereof.
Background
Cysteine (Cys), homocysteine (Hcy) and Glutathione (GSH) are the main thiol-containing amino acids that play an important role in many biological processes. Among them, cys is directly related to a number of important cellular functions, such as antioxidant defense, cell growth, detoxification and metabolism, etc. Thus, abnormalities in Cys levels in cells are also associated with various diseases. Cys deficiency can lead to slow growth rate, reduced hematopoiesis, skin damage, hair decolorization, reduced body weight ratio, plasma albumin levels, leukopenia, liver damage, and Parkinson's disease; in contrast, excess Cys may lead to severe neurotoxicity, alzheimer's disease and cardiovascular disease. It is therefore of great importance to develop efficient methods for monitoring changes in cysteine concentration.
There are many reported methods for detecting cysteine, mainly including high performance liquid chromatography, atomic absorption spectrometry, gas chromatography, methylene blue method, electrochemical analysis and the like, but the methods have the defects of complex sample pretreatment, expensive equipment, complex operation, long detection time consumption and certain limitations. In contrast, the fluorescent probe can be used as a simple and effective Cys detection method, has the advantages of non-invasiveness, high sensitivity, high selectivity and the like, and can be imaged on living cells in real time. The organic micromolecular fluorescent probe has the characteristics of small volume, simple synthesis, quick reaction time, good selectivity, high sensitivity, convenience in real-time detection by taking fluorescence as an output signal and the like, and becomes an important method for detecting cysteine in recent years.
Disclosure of Invention
Aiming at the defects existing in the prior art, the technical problem to be solved by the invention is to provide the (diphenylamino) phenyl flavonoid fluorescent probe which meets the use requirement of cysteine detection. The invention aims to provide a preparation method of the (diphenylamino) phenyl flavonoid fluorescent probe. The invention also solves the technical problem of providing an application of the (diphenylamino) phenyl flavonoid fluorescent probe.
In order to solve the technical problems, the invention adopts the following technical scheme:
the (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine is 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone acrylate, and has the structural formula:
the preparation method of the (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine comprises the following process steps:
1) Taking 4-bromo-2-hydroxyacetophenone as a raw material, and carrying out coupling reaction with 4- (diphenylamino) phenylboronic acid to obtain 4- (diphenylamino) phenyl-2-hydroxyacetophenone;
2) 4- (diphenylamino) phenyl-2-hydroxy acetophenone and furfural undergo condensation cyclization reaction to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone;
3) Esterification reaction is carried out on 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromanone and acryloyl chloride, so as to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromanone acrylate.
In the step 1), 4-bromo-2-hydroxyacetophenone is used as a raw material and is subjected to a coupling reaction with 4- (diphenylamino) phenylboronic acid to obtain 4- (diphenylamino) phenyl-2-hydroxyacetophenone, and the specific preparation steps comprise:
(1) 10mmol of 4-bromo-2-hydroxyacetophenone, 12mmol of 4- (diphenylamino) phenylboronic acid, 40mmol of sodium carbonate and 1mmol of tetrakis (triphenylphosphine) palladium are sequentially added into a dry three-neck flask, 50mL of dioxane and 15mL of water are added to dissolve the solid, the mixture is heated to 90 ℃ under the condition of nitrogen to react overnight, and the reaction is stopped after the reaction is completed by tracking and monitoring by a TLC method;
(2) Removing dioxane and water from the reaction solution by reduced pressure distillation, adding ethyl acetate, washing with saturated saline solution to be neutral, drying an organic phase by anhydrous sodium sulfate, filtering and concentrating to obtain a crude product of 4- (diphenylamino) phenyl-2-hydroxyacetophenone;
(3) The crude 4- (diphenylamino) phenyl-2-hydroxyacetophenone product was separated by a silica gel column (ethyl acetate/petroleum ether=1/20, v/v) to give 4- (diphenylamino) phenyl-2-hydroxyacetophenone.
In the step 2), 4- (diphenylamino) phenyl-2-hydroxy acetophenone and furfural undergo condensation cyclization reaction to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone, wherein the specific preparation steps comprise:
(1) Sequentially adding 5mmol of 4- (diphenylamino) phenyl-2-hydroxyacetophenone, 5mmol of furfural, 10mmol of sodium hydroxide and 50mL of ethanol into a dry three-neck flask at the temperature of 0 ℃ and reacting for 8-10 h at room temperature;
(2) The reaction mixture was poured into ice water, acidified with dilute hydrochloric acid, filtered and washed to give a yellow solid precipitate. Then the yellow solid, 10mL of ethanol and 5mL of 20% NaOH aqueous solution are sequentially added into a dry three-neck flask, and 5mL of 30% H is added dropwise at 0 DEG C 2 O 2 Reacting for 5-6h at room temperature.
(3) The reaction solution is poured into ice water, neutralized by dilute hydrochloric acid, filtered to obtain a crude product of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone, and then recrystallized by cold ethanol to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone.
In the step 3), the esterification reaction of the 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone and the acryloyl chloride is carried out to obtain the 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone acrylate, and the specific preparation steps comprise:
(1) 1mmol of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone, 2mmol of acryloyl chloride and 2mmol of triethylamine are sequentially added into a dry three-neck flask, and the mixture is reacted for 10 to 12 hours at room temperature;
(2) Adding dichloromethane into the reaction solution again, washing the reaction solution to be neutral by using saturated saline solution, and drying, filtering and concentrating an organic phase by using anhydrous sodium sulfate to obtain a crude product of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone acrylate;
(3) The crude 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate was isolated by column on silica gel (ethyl acetate/petroleum ether=1/5, v/v) to give 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate.
The (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine is applied to cysteine detection.
The (diphenylamino) phenyl flavonoid fluorescent probe can react with cysteine rapidly and specifically at room temperature, and the solution changes from colorless to orange-red fluorescence.
The beneficial effects are that: compared with the prior art, the novel (diphenylamino) phenyl flavonoid fluorescent probe prepared by using the natural renewable resource furfural as a raw material can perform a specific reaction with cysteine, the fluorescent color of the solution is changed from colorless to orange red under 365nm ultraviolet light, and the fluorescent probe has the characteristics of good specificity and high sensitivity, and has a good application prospect as a fluorescent probe for detecting the cysteine.
Drawings
FIG. 1 is Cys, GSH, hcy, gly, arg, asp, ala, his, lys, glu, ser, val, tyr, F - ,C - ,Br - ,I - ,NO 3 - ,CO 3 2- ,SO 4 2- ,HSO 3 - ,SO 3 2- ,Mg 2+ ,Na + ,Cu 2+ ,Ca 2+ ,Ag + ,K + Equal to 28 different analytesA graph of the effect on the fluorescence spectrum of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate;
FIG. 2 is a graph showing the effect of different concentrations of cysteine on the fluorescence spectrum of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate.
Detailed Description
The invention will be further illustrated with reference to specific examples.
Example 1
The preparation of (diphenylamino) phenyl flavonoids has the following reaction formula:
the method comprises the following specific steps:
1) Preparation of 4- (diphenylamino) phenyl-2-hydroxyacetophenone:
10mmol of 4-bromo-2-hydroxyacetophenone, 12mmol of 4- (diphenylamino) phenylboric acid, 40mmol of sodium carbonate and 1mmol of tetrakis (triphenylphosphine) palladium are sequentially added into a dry three-neck flask, 50mL of dioxane and 15mL of water are added for dissolution, the mixture is heated to 90 ℃ under the protection of nitrogen for reaction overnight, and a TLC method is used for tracking and monitoring until the reaction is complete, and the reaction is stopped; removing dioxane and water from the reaction solution by reduced pressure distillation, adding ethyl acetate, washing with saturated saline solution to be neutral, drying an organic phase by anhydrous sodium sulfate, filtering and concentrating to obtain a crude product of 4- (diphenylamino) phenyl-2-hydroxyacetophenone; the crude 4- (diphenylamino) phenyl-2-hydroxyacetophenone product was separated by a silica gel column (ethyl acetate/petroleum ether=1/20, v/v) to give 4- (diphenylamino) phenyl-2-hydroxyacetophenone. Yield is as follows: 83.6% and purity of 99.2%. 1 H NMR(600MHz,CDCl 3 )δ:12.39(s,1H),7.76(d,J=8.4Hz,1H),7.54-7.48(m,2H),7.32-7.27(m,4H),7.19(d,J=1.8Hz,1H),7.17-7.11(m,7H),7.08(tt,J=7.3,1.2Hz,2H),2.65(s,3H). 13 C NMR(150MHz,CDCl 3 )δ:203.82,162.80,148.60,148.59,147.33,132.38,131.20,129.43,127.93,124.96,123.53,122.92,118.17,117.26,115.43,26.58.HRMS(m/z):[M+H] + calcd for C 26 H 21 NO 2 +H + ,380.1651;found,380.1649。
2) Preparation of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone:
sequentially adding 5mmol of 4- (diphenylamino) phenyl-2-hydroxyacetophenone, 5mmol of furfural, 10mmol of sodium hydroxide and 50mL of ethanol into a dry three-neck flask at the temperature of 0 ℃ and reacting for 8-10 h at room temperature; the reaction mixture was poured into ice water, acidified with dilute hydrochloric acid, and washed by filtration to give a yellow solid precipitate. Then the yellow solid, 10mL of ethanol and 5mL of 20% NaOH aqueous solution are sequentially added into a dry three-neck flask, and 5mL of 30% H is added dropwise at 0 DEG C 2 O 2 The reaction is carried out for 5 to 6 hours at room temperature. The reaction solution was poured into ice water and neutralized with dilute hydrochloric acid. Filtration gave a crude 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone which was then recrystallized from cold ethanol to give 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone. Yield is as follows: 60.6% and purity 98.5%. 1 H NMR(600MHz,DMSO-d 6 )δ:10.00(s,1H),8.11(d,J=8.3Hz,1H),8.03(s,1H),7.89(s,1H),7.75(dd,J=21.4,8.3Hz,3H),7.34(t,J=7.7Hz,4H),7.28(d,J=3.4Hz,1H),7.09(dd,J=17.7,7.7Hz,6H),7.01(d,J=8.2Hz,2H),6.78(dd,J=3.5,1.7Hz,1H). 13 C NMR(150MHz,DMSO-d 6 )δ:171.48,154.65,148.05,146.68,145.13,144.54,144.14,139.28,137.31,130.91,129.70,128.18,125.42,124.79,123.80,122.64,122.09,120.25,115.18,114.33,112.83.HRMS(m/z):[M+H] + calcd for C 31 H 21 NO 4 +H + ,472.1549;found,472.1548。
3) Preparation of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate:
1mmol of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone, 2mmol of acryloyl chloride, 2mmol of triethylamine and 10 to 20mL of dichloromethane are added to the mixture in sequence to drynessIn a three-neck flask, reacting for 10-12 h at room temperature; washing the reaction solution to be neutral by using saturated saline, and drying, filtering and concentrating an organic phase by using anhydrous sodium sulfate to obtain a crude product of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone acrylate; the crude 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate was isolated by column on silica gel (ethyl acetate/petroleum ether=1/5, v/v) to give 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate. Yield is as follows: 58.6% and purity 98.2%. 1 H NMR(600MHz,DMSO-d 6 )δ:8.14(d,J=1.6Hz,1H),8.09(d,J=8.3Hz,1H),8.02(d,J=1.7Hz,1H),7.85(dd,J=8.4,1.7Hz,1H),7.81(d,J=8.3Hz,2H),7.40-7.32(m,5H),7.16-7.09(m,6H),7.05(d,J=8.3Hz,2H),6.86(dd,J=3.7,1.8Hz,1H),6.69-6.63(m,1H),6.59(dd,J=17.3,10.2Hz,1H),6.31-6.27(m,1H). 13 C NMR(150MHz,DMSO-d 6 )δ:163.18,155.64,148.79,148.15,147.76,147.12,146.19,143.33,135.53,131.00,130.65,130.22,128.78,127.20,126.13,125.34,124.39,124.14,122.51,121.63,117.37,115.11,113.69.HRMS(m/z):[M+H] + calcd for C 34 H 23 NO 5 +H + ,526.1654;found:526.1716。
Example 2
Combining 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate with Cys, GSH, hcy, gly, arg, asp, ala, his, lys, glu, ser, val, tyr, F - ,Cl - ,Br - ,I - ,NO 3 - ,CO 3 2- ,SO 4 2- ,HSO 3 - ,SO 3 2- ,Mg 2+ ,Na + ,Cu 2+ ,Ca 2+ ,Ag + ,K + The 28 different analytes are respectively dissolved in DMSO/PBS (v/v=6/4) buffer solution to prepare the concentration of 1.0x10 -6 M probe solution and concentration of 1.0X10 -5 M28 different analyte solutions, fluorescence spectra of the solutions were measured using a fluorescence spectrometer, junctionThe result is shown in FIG. 1. FIG. 1 shows that the addition of cysteine changes the fluorescence color of the solution under 365nm ultraviolet light from colorless to orange-red, while by the addition of other interferents GSH, hcy, gly, arg, asp, ala, his, lys, glu, ser, val, tyr, F - ,Cl - ,Br - ,I - ,NO 3 - ,CO 3 2- ,SO 4 2- ,HSO 3 - ,SO 3 2- ,Mg 2+ ,Na + ,Cu 2+ ,Ca 2+ ,Ag + ,K + The fluorescence of the solution was not changed by equal comparison. The compound can be used as a fluorescent probe for specifically recognizing cysteine.
Example 3
6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromanone acrylate was formulated to a concentration of 1.0X10 -5 M buffer solution of DMSO/PBS (v/v=6/4), cysteine was dissolved in DMSO/PBS (v/v=6/4) to prepare 0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 40. Mu.M buffer solution. The effect of different concentrations of cysteine on the fluorescence spectrum of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate was measured by titration and the results are shown in figure 2. FIG. 2 shows that the fluorescence intensity at 575nm increases gradually with increasing cysteine concentration in the system, thus demonstrating that the compound can sensitively detect cysteine.

Claims (7)

1. A (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine, which is characterized by having the structural formula:
2. the method for preparing a (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine according to claim 1, which is characterized by comprising the following steps:
1) Taking 4-bromo-2-hydroxyacetophenone as a raw material, and carrying out coupling reaction with 4- (diphenylamino) phenylboronic acid to obtain 4- (diphenylamino) phenyl-2-hydroxyacetophenone;
2) 4- (diphenylamino) phenyl-2-hydroxy acetophenone and furfural undergo condensation cyclization reaction to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone;
3) Esterification reaction is carried out on 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromanone and acryloyl chloride, so as to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromanone acrylate.
3. The method for preparing a (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine according to claim 2, wherein the preparation method of the step 1) is as follows:
(1) 10mmol of 4-bromo-2-hydroxyacetophenone, 12mmol of 4- (diphenylamino) phenylboric acid, 40mmol of sodium carbonate and 1mmol of tetrakis (triphenylphosphine) palladium are sequentially added into a dry three-neck flask, 50mL of dioxane and 15mL of water are added to dissolve the solid, the mixture is heated to 90 ℃ under the condition of nitrogen and reacted for 10 to 12 hours, a TLC method is used for tracking and monitoring, and the reaction is stopped after the reaction is completed;
(2) Removing dioxane and water from the reaction solution by reduced pressure distillation, adding ethyl acetate, washing with saturated saline solution to be neutral, drying an organic phase by anhydrous sodium sulfate, filtering and concentrating to obtain a crude product of 4- (diphenylamino) phenyl-2-hydroxyacetophenone;
(3) The crude 4- (diphenylamino) phenyl-2-hydroxyacetophenone product was separated by a silica gel column with ethyl acetate/petroleum ether=1/20, v/v to give 4- (diphenylamino) phenyl-2-hydroxyacetophenone.
4. The method for preparing a (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine according to claim 2, wherein the specific preparation method of the step 2) is as follows:
(1) Sequentially adding 5mmol of 4- (diphenylamino) phenyl-2-hydroxyacetophenone, 5mmol of furfural, 10mmol of sodium hydroxide and 50mL of ethanol into a dry three-neck flask at the temperature of 0 ℃ and reacting for 8-10 h at room temperature;
(2) The reaction mixture was poured into ice water, acidified with dilute hydrochloric acid, filtered and washed to give a yellow solid precipitate. Then the yellow solid, 10mL of ethanol and 5mL of 20% NaOH aqueous solution are sequentially added into a dry three-neck flask, and 5mL of 30% H is added dropwise at 0 DEG C 2 O 2 Reacting for 5-6h at room temperature;
(3) The reaction solution is poured into ice water, neutralized by dilute hydrochloric acid, filtered to obtain a crude product of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone, and then recrystallized by cold ethanol to obtain 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone.
5. The method for preparing a (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine according to claim 2, wherein the preparation method of the step 3) specifically comprises the following steps:
(1) 1mmol of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone, 2mmol of acryloyl chloride and 2mmol of triethylamine are sequentially added into a dry three-neck flask, and the mixture is reacted for 10 to 12 hours at room temperature;
(2) Washing the reaction solution to be neutral by using saturated saline, and drying, filtering and concentrating an organic phase by using anhydrous sodium sulfate to obtain a crude product of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxy chromone acrylate;
(3) The crude product of 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate was separated by a silica gel column, ethyl acetate/petroleum ether=1/5, v/v, to give 6- (4- (diphenylamino) phenyl) -2- (furan-2-yl) -3-hydroxychromanone acrylate.
6. Use of the (diphenylamino) phenyl flavonoid fluorescent probe for detecting cysteine according to claim 1 for detecting cysteine.
7. The use according to claim 6, characterized in that: the (diphenylamino) phenyl flavonoid fluorescent probe can rapidly and specifically react with cysteine at room temperature, and the solution is changed from colorless to orange-red fluorescence.
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