CN117903095A - 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin and preparation method thereof - Google Patents

8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin and preparation method thereof Download PDF

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CN117903095A
CN117903095A CN202410036953.7A CN202410036953A CN117903095A CN 117903095 A CN117903095 A CN 117903095A CN 202410036953 A CN202410036953 A CN 202410036953A CN 117903095 A CN117903095 A CN 117903095A
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reaction
intermediate compound
hydroxycoumarin
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ethanol
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席高磊
陈芝飞
王清福
李蕾
赵永振
芦昶彤
王泽宁
陈浩洋
赵嘉鸣
杜佳
杨柳依
刘旭
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China Tobacco Henan Industrial Co Ltd
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China Tobacco Henan Industrial Co Ltd
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Abstract

The invention belongs to the technical field of organic synthesis, and particularly relates to 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarins and a preparation method thereof, wherein resorcinol and ethyl acetoacetate are used as raw materials, and the preparation method comprises the steps of firstly preparing the 4-methyl-7-hydroxycoumarins through Knoevenaga l condensation; secondly, synthesizing 4-methyl-7-acetoxycoumarin by adopting esterification reaction; thirdly, obtaining 4-formyl-7-acetoxycoumarin through oxidation reaction; fourthly, preparing 4-formyl-7-hydroxycoumarin by adopting hydrolysis reaction; finally, 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin are synthesized through aldol condensation reaction, and the method has potential application value.

Description

8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin and preparation method thereof
Technical Field
The invention belongs to the technical field of organic synthesis, and particularly relates to 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin and a preparation method thereof.
Background
The integration of various natural framework structures and functional groups into one molecule has become a hotspot in the field of current organic synthesis research. Coumarin and chalcone compounds have natural structure skeletons of benzopyrone and alpha, beta-unsaturated ketone respectively, are widely used in various natural products, and have various physiological and pharmacological activities such as antioxidation, antitumor, antibacterial and the like. The hydroxyl and ferrocene groups are functional groups, and the physiological and pharmacological activities such as antioxidation, anti-tumor, antibiosis and the like can be obviously improved by introducing the hydroxyl and ferrocene groups into the compound. Therefore, coumarin, chalcone, hydroxyl and ferrocenyl groups are integrated into one molecule, and a novel compound with higher physiological and pharmacological activity can be developed, so that the synthesis of the hydroxyl and ferrocenyl coumarin-chalcone compound is necessary to be carried out. However, no report has been made to compounds and syntheses of coumarin, chalcone, hydroxyl and ferrocene groups integrated into one molecule at home and abroad.
Disclosure of Invention
The invention aims to provide 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin and a preparation method thereof, wherein resorcinol and ethyl acetoacetate are used as raw materials, and the 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin is synthesized through five steps of condensation, esterification, oxidation, hydrolysis and aldol condensation of Knoevenagal.
In order to achieve the above purpose, the application is realized by the following technical scheme:
8 (E) -4- (3-aryl acryloyl) -7-hydroxy coumarin, the structural formulas are respectively as follows:
The preparation method of the (E) -4- (3-aryl acryloyl) -7-hydroxy coumarin comprises the following steps:
step 1), adding concentrated H 2SO4 into a reaction bottle, cooling to-5 ℃ in an ice bath, slowly dripping an acetoacetic ester solution of resorcinol into the cooled concentrated H 2SO4 under the stirring condition, keeping the reaction temperature to-5 ℃, continuously stirring for 1-4 hours at the temperature of <10 ℃ after the dripping is finished, then stirring for 10-30 hours after the dripping is finished, pouring into an ice-water mixture to precipitate, filtering and collecting the precipitate, washing with ice water, drying, and recrystallizing with 95% ethanol to obtain a white flocculent intermediate compound (1);
Step 2), sequentially adding the intermediate compound (1) and acetic anhydride into a reaction bottle, heating and refluxing for reaction for 1-4 hours, pouring the reaction mixture into ice water to separate out white solid after the reaction is finished, filtering and collecting the solid, washing with water, drying, and recrystallizing the crude product with 95% ethanol to obtain a white flaky solid intermediate compound (2);
Step 3), sequentially adding an intermediate compound (2), toluene, seO 2 and nitrogen into a reaction bottle, heating and refluxing for reaction for 12-24 hours under the protection of nitrogen, filtering while the reaction is hot after the reaction is finished, concentrating filtrate, and recrystallizing a crude product with 95% ethanol to obtain a pale yellow needle-shaped solid intermediate compound (3);
Step 4), sequentially adding an intermediate compound (3), a solvent and NH 4 OAc into a reaction bottle, reacting for 4-10 hours at room temperature, extracting a reaction solution with ethyl acetate after the reaction is finished, washing with water, drying with anhydrous sodium sulfate, evaporating the solvent under reduced pressure, and separating a crude product by column chromatography to obtain a pale yellow solid intermediate compound (4);
Step 5), sequentially adding an intermediate compound (4), an acetyl aromatic compound, a solvent and a catalyst into a reaction bottle, heating and refluxing for reaction for 4-8 h, cooling to room temperature after the reaction is finished, filtering to obtain a solid, washing with ethanol, drying, and recrystallizing a crude product with 95% ethanol to obtain the target compound (5).
Preferably, in step 1), concentrated H 2SO4 is both solvent and catalyst; resorcinol, ethyl acetoacetate and concentrated H 2SO4 in a molar ratio of 1: (1-1.2): (3-8).
Preferably, in step 2), acetic anhydride is both a solvent and a reactant; the molar ratio of the intermediate compound (1) to the acetic anhydride is 1: (3-10).
Preferably, in step 3), the molar ratio of intermediate compound (2) to SeO 2 is 1: (1-3), the solvent toluene needs to be dried in advance.
Preferably, in step 4), the molar ratio of intermediate compound (3) to NH 4 OAc is 1: (2-5); the solvent is a mixed solution of DMF and water or a mixed solution of DMSO and water.
Preferably, in step 5), the reaction solvent is one of methanol, ethanol or isopropanol; the catalyst is one of piperidine, diethylamine, triethylamine, pyridine or diisopropylamine; the molar ratio of the intermediate compound (4), the acetyl aromatic compound and the catalyst is 1: (1-1.2): (0.05-0.1).
The beneficial effects of the invention are as follows:
According to the technical scheme, resorcinol and ethyl acetoacetate are used as raw materials, and 4-methyl-7-hydroxycoumarin is prepared through Knoevenagal condensation; secondly, synthesizing 4-methyl-7-acetoxycoumarin by adopting esterification reaction; thirdly, obtaining 4-formyl-7-acetoxycoumarin through oxidation reaction; fourthly, preparing 4-formyl-7-hydroxycoumarin by adopting hydrolysis reaction; finally, 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin are synthesized through aldol condensation reaction, and the method has potential application value.
Drawings
FIG. 1 is a nuclear magnetic resonance hydrogen spectrum of (E) -4- (3-phenylpropenoyl) -7-hydroxycoumarin;
FIG. 2 is a nuclear magnetic resonance carbon spectrum of (E) -4- (3-phenylpropenoyl) -7-hydroxycoumarin;
FIG. 3 is a nuclear magnetic resonance hydrogen spectrum of (E) -4- (3-ferrocenyl-acryl) -7-hydroxycoumarin;
FIG. 4 is a nuclear magnetic resonance carbon spectrum of (E) -4- (3-ferrocenyl-acryl) -7-hydroxycoumarin;
FIG. 5 is a nuclear magnetic resonance hydrogen spectrum of (E) -4- (3- (4-methoxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 6 is a nuclear magnetic resonance carbon spectrum of (E) -4- (3- (4-methoxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 7 is a nuclear magnetic resonance hydrogen spectrum of (E) -4- (3- (3-nitrophenyl) acryloyl) -7-hydroxycoumarin;
FIG. 8 is a nuclear magnetic resonance carbon spectrum of (E) -4- (3- (3-nitrophenyl) acryloyl) -7-hydroxycoumarin;
FIG. 9 is a nuclear magnetic resonance hydrogen spectrum of (E) -4- (3- (2-hydroxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 10 is a nuclear magnetic resonance carbon spectrum of (E) -4- (3- (2-hydroxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 11 is a nuclear magnetic resonance hydrogen spectrum of (E) -4- (3- (3-methoxy-4-hydroxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 12 is a nuclear magnetic resonance chromatogram of (E) -4- (3- (3-methoxy-4-hydroxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 13 is a nuclear magnetic resonance hydrogen spectrum of (E) -4- (3, 4-dihydroxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 14 is a nuclear magnetic resonance carbon spectrum of (E) -4- (3, 4-dihydroxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 15 is a nuclear magnetic resonance hydrogen spectrum of (E) -4- (3- (2, 4-dihydroxyphenyl) acryloyl) -7-hydroxycoumarin;
FIG. 16 is a nuclear magnetic resonance carbon spectrum of (E) -4- (3- (2, 4-dihydroxyphenyl) acryloyl) -7-hydroxycoumarin.
Detailed Description
The following examples are given by way of illustration only and are not to be construed as limiting the scope of the invention.
Main experimental reagents and instruments:
Resorcinol, ethyl acetoacetate, H 2SO4, acetic anhydride, toluene, seO 2、NH4 OAc, anhydrous sodium sulfate, acetophenone, acetyl ferrocene, 4-methoxyacetophenone, 3-nitroacetophenone, 2-hydroxyacetophenone, 3-methoxy-4-hydroxyacetophenone, 3, 4-dihydroxyacetophenone, 2, 4-dihydroxyacetophenone, piperidine, ethanol, ethyl acetate, electronic balance, rotary evaporator, electromagnetic heating mantle, bruker AVANCE III MHz nuclear magnetic resonance spectrometer (Bruker Co., U.S.).
The structural formulas of the 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin are respectively as follows:
The preparation method of the (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin comprises the following steps:
In a 250mL round bottom flask, 150mL of H 2SO4 (98%) was added and after cooling to-5-5℃in an ice bath, a solution of 33.0g (300 mmol) of m-xylene in 42.9g of ethyl acetoacetate (330 mmol) was slowly dropped into cooled concentrated H 2SO4 with stirring and the reaction temperature was maintained <10 ℃. After the end of the dropwise addition, stirring is continued for 4 hours at <10 ℃, then stirring is continued for 48 hours after the temperature is raised to room temperature, the mixture is poured into an ice-water mixture to separate out a precipitate, the precipitate is collected by suction filtration, washed by ice water and dried, and recrystallized by 95% ethanol, 45.9g of white flocculent intermediate compound (1) (4-methyl-7-hydroxycoumarin) is obtained, and the yield is 87%, m.p.182-184 ℃.
In a 250mL round bottom flask, 35.2g (200 mmol) of intermediate compound (1) and acetic anhydride (100 mL) were added, and after refluxing under heating for 4h, the reaction mixture was poured into ice water to precipitate a white solid. The solid was collected by suction filtration, washed with water and dried, and the crude product was recrystallized from 95% ethanol to give 42.3g of intermediate compound (2) (4-methyl-7-acetoxycoumarin) as a white flaky solid in 97% yield, m.p.133-134 ℃.
In a 500mL round-bottomed flask, 32.7g (150 mmol) of intermediate compound (2), anhydrous toluene (350 mL) and 3835.0 g (300 mmol) of SeO 2 were added, and under nitrogen protection, after refluxing under heating for 16 hours, the reaction was filtered while it is still hot, the filtrate was concentrated, and the crude product was recrystallized from 95% ethanol to give 29.3g of intermediate compound (3) (4-formyl-7-acetoxycoumarin) as pale yellow needle-like solid in a yield of 84%, m.p.145-146 ℃.
In a 250mL round bottom flask, 23.2g (100 mmol) of intermediate compound (3), DMF (30 mL), water (150 mL) and 15.4g (200 mmol) of NH 4 OAc were added, the reaction was carried out at room temperature for 8 hours, after the completion of the reaction, the reaction solution was extracted with ethyl acetate, washed with water, dried over anhydrous sodium sulfate, the solvent was distilled off under reduced pressure, and the crude product was separated by column chromatography to give 18.2g of pale yellow solid intermediate compound (4) (4-formyl-7-hydroxycoumarin) in 96% yield, m.p.129-130 ℃.
1.9G (10 mmol) of intermediate compound (4), 12mmol of acetyl aromatic compound (12 mmol) and 15mL of 95% ethanol and 0.5mL of piperidine are added into a 50mL round bottom flask, the mixture is refluxed and stirred for 6 hours, cooled to room temperature, and suction filtration is carried out to obtain a solid, the solid is washed with a small amount of ethanol, then with petroleum ether, the solid is dried, and the crude product is recrystallized with 95% ethanol to obtain the target product (5) ((E) -4- (3-aryl acryloyl) -7-hydroxy coumarin) with a yield of more than 70%.
The structures of the target compounds 5a to 5H were detected by Bruker AVANCE III MHz nuclear magnetic resonance spectrometer (Bruker Co., U.S.A.), and 1H NMR and 13C NMR are shown in the accompanying drawings.
(E) -structural characterization data of 4- (3-aryl-acryl) -7-hydroxycoumarin:
(E) -4- (3-phenylpropenoyl) -7-hydroxycoumarin (5 a): yellow solid, yield 84%,m.p.158-159℃.1H NMR(300MHz,CDCl3)δ:13.805(s,1H),8.239-8.291(m,1H),7.950-8.002(m,1H),7.674-7.745(m,3H),7.436(s,3H),6.958(d,J=9.0Hz,1H),6.195(s,1H)13CNMR(75MHz,CDC|3):193.377,167.295,159.260,154.828,153.142,145.908,134.783,131.088,131.013,130.152,129.071,128.169,126.132,125.256,115.223,112.034 111.070,109.646.HR-MS(ESI)m/z:Calcd for C18H13O4{[M+H]+}293.080 9,found 293.081 3.
(E) -4- (3-ferrocenylacryloyl) -7-hydroxycoumarin (5 b): red solid, yield 75%,m.p.140-142℃.1H NMR(400MHz,CDCl3)δ:13.805(s,1H),8.265(d,J=20.8Hz,1H),7.436(s,3H),6.195(s,1H),4.671(s,2H),4.554(s,2H),4.388(s,5H);13C NMR(100MHz,CDCl3):159.277,157.354,152.605,150.998,130.133,129.185,127.567,126.398,124.857,124.100,117.173,115.819,114.492,88.495,72.389,69.963,68.529.HR-MS(ESI)m/z:Calcd for C22H17FeO4{[M+H]+}401.047 1,found 401.047 8.
(E) -4- (3- (4-methoxyphenyl) acryloyl) -7-hydroxycoumarin (5 c): yellow solid, yield 87%,m.p.174-175℃.1H NMR(300MHz,CDCl3)δ:14.007(s,1H),8.147-8.198(m,1H),7.946-7.998(m,1H),7.655-7.716(m,3H),6.931-6.977(m,3H),6.187(s,1H),3.866(s,3H).13C NMR(75MHz,CDCl3):193.054,167.284,162.091,159.340,154.730,153.068,146.034,130.939,130.690,127.552,123.633,115.145,114.499,111.921,110.903,109.700,55.348.HR-MS(ESI)m/z:Calcd for C19H15O5{[M+H]+}323.091 4,found 323.092 5.
(E) -4- (3- (3-nitrophenyl) acryloyl) -7-hydroxycoumarin (5 d): yellow solid, yield 69%,m.p.211-213℃.1H NMR(300MHz,DMSO-d6)δ:10.982(s,1H),8.578(s,1H),8.259(d,J=7.8Hz,2H),7.686-7.755(m,2H),7.550-7.604(m,1H),7.344-7.398(m,1H),6.967(d,J=8.7Hz,1H),6.196(s,1H).13C NMR(75MHz,DMSO-d6)δ:192.337,159.524,158.243,153.507,151.583,148.279,143.074,136.108,134.205,130.328,127.386,124.872,123.651,114.952,112.763,112.060,110.592.HR-MS(ESI)m/z:Calcd for C18H12NO6{[M+H]+}338.066 0,found 338.066 9.
(E) -4- (3- (2-hydroxyphenyl) acryloyl) -7-hydroxycoumarin (5 e): yellow solid, yield 86%,m.p.187-189℃.1H NMR(300MHz,DMSO-d6)δ:10.955(s,1H),10.208(s,1H),7.715(d,J=8.7Hz,1H),7.659(dd,J=7.8Hz,J=1.2Hz,1H),7.556-7.610(m,1H),7.265(td,J=7.5Hz,J=1.5Hz,1H),7.118-7.173(m,1H),6.962(d,J=8.7Hz,1H),6.893(d,J=8.1Hz,1H),6.845(t,J=7.5Hz,1H),6.187(d,J=1.2Hz,1H).13C NMR(75MHz,DMSO-d6)δ:192.638,159.595,158.210,156.952,153.656,151.494,141.419,132.399,128.774,127.287,127.176,120.751,119.580,116.265,115.353,112.762,111.982,110.559.HR-MS(ESI)m/z:Calcd for C18H13O5{[M+H]+}309.075 8,found 309.077 2.
(E) -4- (3- (3-methoxy-4-hydroxyphenyl) acryloyl) -7-hydroxycoumarin (5 f): orange-red solid, yield 82%,m.p.195-197℃.1H NMR(300MHz,DMSO-d6)δ:10.915(s,1H),9.741(s,1H),7.706(d,J=8.7Hz,1H),7.320(d,J=1.8Hz,1H),7.198-7.252(m,1H),7.130(dd,J=8.4Hz,J=2.1Hz,1H),6.996-7.050(m,1H),6.947(d,J=8.7Hz,1H),6.784(d,J=8.1Hz,1H),6.184(d,J=1.2Hz,1H),3.800(s,3H).13C NMR(75MHz,DMSO-d6)δ:192.234,159.668,158.166,153.614,151.473,149.875,147.974,146.858,126.979,125.634,125.192,123.684,115.633,115.499,112.769,112.002,111.778,110.533,55.683.HR-MS(ESI)m/z:Calcd for C19H15O6{[M+H]+}339.086 4,found 339.086 8.
(E) -4- (3, 4-dihydroxyphenyl) acryloyl) -7-hydroxycoumarin (5 g): red solid, yield 74%,m.p.227-229℃.1H NMR(300MHz,DMSO-d6)δ:10.928(s,1H),9.719(s,1H),9.173(s,1H),7.696(d,J=8.7Hz,1H),7.135-7.189(m,1H),7.062(s,1H),6.924-6.994(m,2H),6.736-6.852(m,2H),6.172(s,1H).13C NMR(75MHz,DMSO-d6)δ:191.913,159.637,158.207,153.595,151.486,149.037,146.781,145.685,127.078,125.548,124.627,122.356,115.812,115.376,114.946,112.750,112.006,110.519.HR-MS(ESI)m/z:Calcd for C18H13O6{[M+H]+}325.070 7,found 325.071 9.
(E) -4- (3- (2, 4-dihydroxyphenyl) acryloyl) -7-hydroxycoumarin (5 h): red solid, yield 74%,m.p.240-242℃.1H NMR(300MHz,DMSO-d6)δ:10.908(s,1H),10.114(s,1H),10.003(s,1H),7.690(d,J=8.7Hz,1H),7.493(d,J=5.4Hz,1H),7.452(d,J=1.8Hz,1H),6.962(d,J=3.3Hz,1H),6.920(d,J=3.9Hz,1H),6.329(d,J=2.4Hz,1H),6.287(dd,J=8.7Hz,J=2.4Hz,1H),6.174(s,1H).13C NMR(75MHz,DMSO-d6)δ:192.268,161.775,159.708,158.885,158.238,153.715,151.492,142.252,130.455,126.940,123.850,115.714,112.780,112.689,111.972,110.526,108.266,102.479.HR-MS(ESI)m/z:Calcd for C18H13O6{[M+H]+}325.070 7,found 325.072 2.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Various modifications and alterations of this invention will occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the related principles of the present invention and the implementation methods thereof should be included in the protection scope of the present invention.

Claims (7)

1.8 (E) -4- (3-aryl-acryl) -7-hydroxycoumarin, characterized in that the structural formulae are respectively:
2. The method for preparing 8 (E) -4- (3-aryl-acryloyl) -7-hydroxycoumarin according to claim 1, wherein the following steps are adopted:
Step 1), adding concentrated H 2SO4 into a reaction bottle, cooling to-5 ℃ in an ice bath, slowly dripping an acetoacetic ester solution of resorcinol into the cooled concentrated H 2SO4 under the stirring condition, keeping the reaction temperature at-5 ℃, continuously stirring for 1-4 hours at the temperature of <10 ℃ after the dripping is finished, then stirring for 10-30 hours after the dripping is finished, pouring into an ice-water mixture to separate out precipitate, filtering and collecting the precipitate, washing with ice water, drying, and recrystallizing with 95% ethanol to obtain a white flocculent intermediate compound (1);
Step 2), sequentially adding the intermediate compound (1) and acetic anhydride into a reaction bottle, heating and refluxing for reaction for 1-4 hours, pouring the reaction mixture into ice water to separate out white solid after the reaction is finished, filtering and collecting the solid, washing with water, drying, and recrystallizing the crude product with 95% ethanol to obtain a white flaky solid intermediate compound (2);
Step 3), sequentially adding an intermediate compound (2), toluene, seO 2 and nitrogen into a reaction bottle, heating and refluxing for reaction for 12-24 hours under the protection of nitrogen, filtering while the reaction is hot after the reaction is finished, concentrating filtrate, and recrystallizing a crude product with 95% ethanol to obtain a pale yellow needle-shaped solid intermediate compound (3);
Step 4), sequentially adding an intermediate compound (3), a solvent and NH 4 OAc into a reaction bottle, reacting for 4-10 hours at room temperature, extracting a reaction solution with ethyl acetate after the reaction is finished, washing with water, drying with anhydrous sodium sulfate, evaporating the solvent under reduced pressure, and separating a crude product by column chromatography to obtain a pale yellow solid intermediate compound (4);
Step 5), sequentially adding an intermediate compound (4), an acetyl aromatic compound, a solvent and a catalyst into a reaction bottle, heating and refluxing for reaction for 4-8 h, cooling to room temperature after the reaction is finished, filtering to obtain a solid, washing with ethanol, drying, and recrystallizing a crude product with 95% ethanol to obtain the target compound (5).
3. The method according to claim 2, wherein in step 1), concentrated H 2SO4 is both solvent and catalyst; resorcinol, ethyl acetoacetate and concentrated H 2SO4 in a molar ratio of 1: (1-1.2): (3-8).
4. The method according to claim 2, wherein in step 2), acetic anhydride is both solvent and reactant; the molar ratio of the intermediate compound (1) to the acetic anhydride is 1: (3-10).
5. The process according to claim 2, wherein in step 3), the molar ratio of intermediate compound (2) to SeO 2 is 1: (1-3), the solvent toluene needs to be dried in advance.
6. The method according to claim 2, wherein in step 4), the molar ratio of intermediate compound (3) to NH4OAc is 1: (2-5); the solvent is a mixed solution of DMF and water or a mixed solution of DMSO and water.
7. The method according to claim 2, wherein in step 5), the reaction solvent is one of methanol, ethanol or isopropanol; the catalyst is one of piperidine, diethylamine, triethylamine, pyridine or diisopropylamine; the molar ratio of the intermediate compound (4), the acetyl aromatic compound and the catalyst is 1: (1-1.2): (0.05-0.1).
CN202410036953.7A 2024-01-10 2024-01-10 8 (E) -4- (3-aryl acryloyl) -7-hydroxycoumarin and preparation method thereof Pending CN117903095A (en)

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