CN114920639A - Novel method for synthesizing curcumin analogue - Google Patents

Novel method for synthesizing curcumin analogue Download PDF

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CN114920639A
CN114920639A CN202210744538.8A CN202210744538A CN114920639A CN 114920639 A CN114920639 A CN 114920639A CN 202210744538 A CN202210744538 A CN 202210744538A CN 114920639 A CN114920639 A CN 114920639A
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刘静怡
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Nafi Shenzhen Pharmaceutical Technology Co ltd
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Abstract

The invention discloses a preparation method of a curcumin analogue, which has the following structural formula:

Description

Novel method for synthesizing curcumin analogue
Technical Field
The invention belongs to the field of chemical synthesis, and particularly relates to a synthesis method of curcumin analogues.
Background
Curcumin and its analogues are compounds extracted from rhizomes of plants of Zingiberaceae and Araceae, and have various pharmaceutical effects. But is separated from natural products, and mass products cannot be rapidly obtained. There is a need to develop methods for industrial synthesis.
CN201611205572.9 discloses a method for artificially synthesizing curcumin and derivatives thereof. The method takes calcium acetylacetonate as an acetylacetone source, and obtains an intermediate (I) curcumin calcium salt through claisen-Schmitt ester condensation reaction with a corresponding benzaldehyde derivative and dehydration under the catalysis of a dehydrating agent tri-n-butyl borate; and hydrolyzing the intermediate (I) by a one-pot method to obtain a crude product, and purifying the crude product to obtain a final product curcumin and derivatives thereof. CN201911371013.9 provides a method for artificially synthesizing curcumin and its derivatives, which comprises reacting acetylacetone with boron oxide under weak acid conditions to generate a complex, protecting methylene between two ketone carbonyls, adding a catalyst, reacting the complex with vanillin (benzaldehyde derivative) to obtain curcumin derivative intermediate (I), and hydrolyzing to obtain curcumin derivative. However, there are many kinds of curcumin and derivatives thereof, and the compounds synthesized in the above two applications are structurally different from the analog to be synthesized in the present invention.
US20060276536 provides a method for artificially synthesizing curcumin and derivatives thereof, and covers curcumin analogs to be synthesized by the present invention. It uses 2-methoxy benzaldehyde and acetone to react, uses sodium hydroxide as alkali, and obtains the target product. The patent takes an ether/hexane mixed solution as a recrystallization solvent, wherein ether is a tube product, is flammable and explosive and is not suitable for being used as a solvent for mass production, and the product recrystallized by the mixed solvent has low purity and a crystal form structure is amorphous, so that the purity requirement cannot be met.
W02011029359 reports a synthesis method of the curcumin analogue. The method comprises the steps of reacting 2-methoxybenzaldehyde with acetone, dissolving metal sodium in methanol as alkali, and reacting to obtain a target product. The metal sodium is a dangerous metal product, is easy to explode and be inflammable when meeting water, and is not suitable for mass production. Meanwhile, the purification method is simple water washing, ethanol washing and acetone washing, and the purity of the obtained product is far from the requirement.
W02018086197 also reports the synthesis of this compound by reacting 2-methoxybenzaldehyde with acetone to give the desired product using K0 as base. The patent only washes with a large amount of water and a small amount of ethanol/water solution, and only obtains crude products of the curcumin analogue. The product prepared by the method has the same lower purity.
Disclosure of Invention
The invention aims to provide a novel synthesis method of curcumin analogues.
The technical scheme adopted by the invention is as follows: a novel method for synthesizing curcumin analog is provided.
a) The structural formula of the curcumin analogue is as follows:
Figure BDA0003715356630000021
b) the synthesis method comprises the following steps:
firstly, o-hydroxy trans-cinnamic acid reacts with ozone to obtain salicylaldehyde;
secondly, methyl iodide is used as a methylation reagent, and a product 2-methoxybenzaldehyde is obtained through methylation reaction;
and thirdly, reacting 2-methoxybenzaldehyde with acetone, adding an alkalizing agent, and recrystallizing to obtain the curcumin analogue.
Preferably, in the first reaction step, acetonitrile/water is used as a solvent in a volume ratio of 1-2: 1-2, methanol is used as a solvent for recrystallization, and the temperature is controlled between-15 ℃ and 0 ℃.
Preferably, in the step 1), after the reaction is completed, the reaction solution is fully blown by oxygen, then ethyl acetate is added for dilution, a separating funnel is used for layering, and an organic phase is collected; the aqueous phase was extracted with ethyl acetate until no product remained in the aqueous phase; mixing organic phases, washing with a saturated sodium bicarbonate solution and a saturated saline solution in sequence; the organic phase was collected and dried over anhydrous sodium sulfate.
Preferably, in the step 1), the product dried by anhydrous sodium sulfate is subjected to reduced pressure distillation to obtain colorless transparent liquid salicylaldehyde.
Preferably, in the second step of reaction, the molar ratio of the salicylaldehyde to the methyl iodide to the anhydrous potassium carbonate is 1: 1-1: 4, and the reaction temperature is 25-50 ℃; preferably, the molar ratio of the salicylaldehyde to the methyl iodide to the anhydrous potassium carbonate is 1: 3, and the temperature is 40 ℃.
Preferably, in the second reaction step, the solvent is selected from acetonitrile.
Preferably, the product 2-methoxybenzaldehyde obtained after the second reaction is extracted and dried with anhydrous sodium sulfate, and is directly put into the next reaction without further purification.
Preferably, in the third step of the reaction, the 2-methoxybenzaldehyde and acetone are added in a molar ratio of 2: 1.
Preferably, in the third reaction step, potassium methoxide is preferably selected as the alkalizing agent.
Preferably, the synthesis method is as follows: the final curcumin analogue is synthesized by adopting a three-step synthesis route, wherein the first step is ozonolysis, and salicylaldehyde is obtained by using a mixed solvent of acetonitrile and water (1: 1) and ozone for about 2-3 hours at the temperature of 0 ℃. The second step is methylation reaction, methyl iodide is used as a methylation reagent, potassium carbonate is used as alkali, and the reaction is carried out in acetonitrile overnight to obtain the product 2-methoxybenzaldehyde in the second step. The third step is that methyl salicylaldehyde reacts with acetone, potassium methoxide is used as alkali, and the curcumin analogue (1E, 4E) -1, 5-bis (2-methoxyphenyl) penta-1, 4-diene-3-ketone can be obtained after recrystallization.
The reaction formula is as follows:
Figure BDA0003715356630000031
another object of the present invention is to provide a process for preparing a high purity curcumin analog, said curcumin analog having the following structural formula:
Figure BDA0003715356630000032
the high-purity curcumin analogue is obtained by reacting 2-methoxybenzaldehyde with acetone, adding an alkalizing agent, taking methanol as a recrystallization solvent, and recrystallizing, wherein the purity is higher than 95%, preferably higher than 98%, and further preferably higher than 99%.
The invention has the following beneficial effects:
1. the invention adopts ozonolysis method in the first step of salicylaldehyde generation reaction, can effectively avoid using precious metal oxidant, and has little pollution to the environment. And the reaction product is purified by a reduced pressure distillation method, so that the purification by silica gel column chromatography is avoided, and the generation of solid waste and waste liquid can be effectively reduced. In the process of synthesizing 2-methoxybenzaldehyde in the second step, ethyl acetate and saturated sodium chloride solution are used for extraction for multiple times, an upper organic layer is taken, the solvent is evaporated under reduced pressure, further purification is not required by a silica gel chromatographic column, and the mixture can be directly put into the next step for reaction. In the third step of the reaction for generating the final product curcumin analogue, methanol can be adopted for recrystallization, and silica gel chromatographic columns are avoided for further purification. Compared with the prior art, the method does not use any precious metal catalyst or halogenated solvent, and does not generate a large amount of solid waste. Therefore, the method has the advantages of simple steps, easy operation, less pollution, high yield, convenient raw material obtaining and the like, and has wide application value.
2. The invention adopts methanol as a solvent for recrystallization to obtain crystalline crystals with the purity of more than 99 percent.
3. The invention provides a new synthetic route of curcumin analogues, adopts three-step synthesis, and is beneficial to new drug declaration.
In conclusion, the invention provides a new way to synthesize the curcumin analogue, and the method has the advantages of simple operation, easily obtained raw materials and easy industrial production. The method can obtain curcumin analogue with high yield and high purity by recrystallization without silica gel column chromatography.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 shows the chemical formula and mass spectra data for the product prepared in step B of example 1;
FIG. 2 shows the chemical formula and mass spectra data for the product prepared in step C of example 1;
FIG. 3 shows the chemical structure and nuclear magnetic data of the product prepared in step C of example 1;
FIG. 4 shows a reaction scheme of the present invention.
FIG. 5 shows the chemical structure and mass spectra data for the product prepared in comparative example 1-step A;
FIG. 6 shows the chemical structure and mass spectra data of the product prepared in comparative example 2-step A
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Example 1
Step A: preparation of salicylaldehyde from ortho-hydroxy trans-cinnamic acid
Figure BDA0003715356630000041
Under the condition of ice salt bath (-10-0 ℃), o-hydroxy trans-cinnamic acid (20.0 g, 121.9 mmol) is added into a 250 ml round-bottom flask, dissolved in water (70 ml) and acetonitrile (70 ml), ozone gas is introduced into the suspension through a pipeline by using an ozone generator after the temperature is reduced to about-10 ℃, and the ozone is blown for about 2 hours under stirring until the suspension becomes a clear solution.
After the reaction was completed, the reaction solution was blown with oxygen for 2 minutes, diluted with ethyl acetate (200 ml), and separated into layers with a separatory funnel, and the organic phase was collected. The aqueous phase was extracted with ethyl acetate (100 ml × 2) until no product remained in the aqueous phase. The organic phases were combined, washed with saturated aqueous sodium bicarbonate (150 ml. times.2) and saturated brine (150 ml. times.1). The organic phase was collected, dried over anhydrous sodium sulfate and finally concentrated under reduced pressure. The resulting residue was purified by distillation under reduced pressure (vacuum pressure-680 mmHg), oil bath at 133 ℃ and collection of 108-110 ℃ fractions gave 9.3 g of colorless transparent liquid salicylaldehyde (yield: 62.8%).
And B: preparation of 2-methoxybenzaldehyde from salicylaldehyde
Figure BDA0003715356630000042
Salicylaldehyde (9.3 g, 76.2 mmol), methyl iodide (32.4 g, 228.7 mmol) and anhydrous potassium carbonate (31.5 g, 228.7 mmol) were dissolved in acetonitrile (90 ml) at room temperature, followed by heating to 40 ℃ and stirring the reaction under sealed conditions overnight. After completion of the reaction, the reaction was quenched by addition of water (50 ml), extracted with ethyl acetate (150 ml × 3), and the organic phases were combined, followed by washing with 1 mol/l aqueous hydrochloric acid (100 ml × 2), saturated brine (100 ml × 2), drying over anhydrous sodium sulfate, filtration and concentration under reduced pressure. 9.3 g of 2-methoxybenzaldehyde was obtained as an oil, which was directly used in the next step without further purification (yield: 89.7%). LCMS: RT ═ 1.70min, [ M + H] + ＝137.11，calcd for C 8 H 8 O 2 ：136.15。
And C: preparation of (1E, 4E) -1, 5-bis (2-methoxyphenyl) pentan-1, 4-dien-3-one from 2-methoxybenzaldehyde
Figure BDA0003715356630000051
2-methoxybenzaldehyde (9.3 g, 68.3 mmol) was dissolved in methanol (90 ml) at room temperature, followed by addition of acetone (2.0 g, 34.1 mmol) and cooling to 0 ℃ with stirring. Solid potassium methoxide (4.8 g, 68.3 mmol) was weighed out and added to the reaction solution in portions. After the addition was complete, the reaction was warmed to room temperature and stirred continuously until a large amount of yellow solid precipitated. After the reaction was complete, the reaction was filtered and a yellow solid was collected and washed twice with methanol (50 ml). The yellow solid was then dissolved in dichloromethane (300 ml), washed with water (80 ml × 2), washed with saturated brine (80 ml × 2), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting oil was recrystallized from methanol to give 5.7 g of (1E, 4E) -1, 5-bis (2-methoxyphenyl) penta-1, 4-dien-3-one as yellow crystals (yield 57.3%). LCMS: RT ═ 4.28min, [ M + H] + ＝295.14，calcd for C 19 H 18 O 3 ：294.35。 1 H NMR(400MHz，CDCl 3 )δ8.12(d，J＝16.1Hz，2H)，7.68(dd，J＝7.7，1.7Hz，2H)，7.42(ddd，J＝8.6，7.4，1.7Hz，2H)，7.23(d，J＝16.1Hz，2H)，7.04(td，J＝7.5，1.1Hz，2H)，6.99(dd，J＝8.4，1.0Hz，2H)，3.97(s，6H)。
The purity of the product is more than 99 percent.
The reaction scheme of this example is as follows:
Figure BDA0003715356630000052
example 2
Steps A and C example 1 is the same except that step B is:
salicylaldehyde (9.3 g, 76.2 mmol), methyl iodide (32.4 g, 228.7 mmol) and anhydrous potassium carbonate (31.5 g, 228.7 mmol) were dissolved in acetonitrile (90 ml) at room temperature, then heated to 30 ℃ and the reaction was stirred under closed conditions overnight. After completion of the reaction, the reaction was quenched by addition of water (50 ml), extracted with ethyl acetate (150 ml × 3), and the organic phases were combined, followed by washing with 1 mol/l aqueous hydrochloric acid (100 ml × 2), saturated brine (100 ml × 2), drying over anhydrous sodium sulfate, filtration and concentration under reduced pressure. 8.27 g of 2-methoxybenzaldehyde was obtained as an oil, which was directly charged into the next step without further purification (yield: about 80%).
Example 3
Steps A and C example 1 is the same except that step B is:
salicylaldehyde (9.3 g, 76.2 mmol), methyl iodide (32.4 g, 228.7 mmol) and anhydrous potassium carbonate (31.5 g, 228.7 mmol) were dissolved in acetonitrile (90 ml) at room temperature, then heated to 25 ℃ and the reaction was stirred under closed conditions overnight. After completion of the reaction, the reaction was quenched by addition of water (50 ml), extracted with ethyl acetate (150 ml × 3), and the organic phases were combined, followed by washing with 1 mol/l aqueous hydrochloric acid (100 ml × 2), saturated brine (100 ml × 2), drying over anhydrous sodium sulfate, filtration and concentration under reduced pressure. 7.23 g of 2-methoxybenzaldehyde was obtained as an oil, which was directly used in the next step without further purification (yield: about 70%).
Example 4
Steps A and C example 1 is the same except that step B is:
salicylaldehyde (9.3 g, 76.2 mmol), methyl iodide (21.6 g, 152.5 mmol) and anhydrous potassium carbonate (21.0 g, 152.47 mmol) were dissolved in acetonitrile (90 ml) at room temperature, followed by heating to 40 ℃ and stirring the reaction under closed conditions overnight. After the reaction was completed, the reaction was quenched by adding water (50 ml), extracted with ethyl acetate (150 ml × 3), and the organic phases were combined, followed by washing with 1 mol/l aqueous hydrochloric acid (100 ml × 2), saturated brine (100 ml × 2), dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. 6.21 g of 2-methoxybenzaldehyde was obtained as an oil, which was directly charged into the next step without further purification (yield: about 60%).
Example 5
Steps A and C example 1 is the same except that step B is:
salicylaldehyde (9.3 g, 76.2 mmol), methyl iodide (10.8 g, 76.2 mmol) and anhydrous potassium carbonate (31.5 g, 228.7 mmol) were dissolved in acetonitrile (90 ml) at room temperature, followed by heating to 40 ℃ and stirring the reaction under closed conditions overnight. After completion of the reaction, the reaction was quenched by addition of water (50 ml), extracted with ethyl acetate (150 ml × 3), and the organic phases were combined, followed by washing with 1 mol/l aqueous hydrochloric acid (100 ml × 2), saturated brine (100 ml × 2), drying over anhydrous sodium sulfate, filtration and concentration under reduced pressure. 5.15 g of 2-methoxybenzaldehyde was obtained as an oil, which was directly used in the next step without further purification (yield: about 50%).
The results of step 2 of examples 1 to 5 are as follows:
Figure BDA0003715356630000071
from the comparison, when the feeding ratio A: B: C is 1: 3, the reaction temperature is controlled at 40 ℃ and above, and the yield of the reaction is the highest and reaches 90%. At 40 deg.C, when the ratio of A to B to C is 1 to 3, the yield is up to 90%.
Comparative example 1
Step A: preparation of 2-methoxybenzoic thioesters from 2-methoxybenzoic acid
Figure BDA0003715356630000081
2-Methoxybenzoic acid (10.0 g, 65.7 mmol) and ethanethiol (4.3 g, 69.0 mmol) were dissolved in a dry solution of dichloromethane (100 ml) at room temperature, followed by the addition of 4-dimethylaminopyridine (4.0 g, 32.8 mmol) and dicyclohexylcarbodiimide (27.1 g, 131.4 mmol) in that order. The reaction solution was stirred at room temperature for 1 hour. After the reaction was complete, it was filtered through celite and washed with dichloromethane (200 ml). The resulting organic layer was washed with 1 mol/l aqueous hydrochloric acid (100 ml. times.3) and saturated brine (100 ml. times.1). Collecting the organic phase, using anhydrous sulfuric acidSodium drying, and concentrating under reduced pressure. The obtained residue was purified by silica gel column chromatography (petroleum ether: ethyl acetate: 15: 1) to obtain 10.3 g of 2-methoxybenzoic acid ethyl thioester as a white solid (yield: 79.9%). LCMS: RT 2.02min, [ M-EtS] + ＝135.20，calcd for C 8 H 7 O 2 ：135.14。
And B: preparation of 2-methoxybenzaldehyde from 2-methoxybenzoic acid ethyl thioester
Figure BDA0003715356630000082
Ethyl 2-methoxybenzoate (10.3 g, 52.6 mmol) was dissolved in a dry dichloromethane (100 ml) solution at room temperature, and triethylsilane (18.3 g, 157.7 mmol) and 10% Pd/C (660.2 mg) were added sequentially. While nitrogen was replaced three times, stirring was continued overnight under nitrogen atmosphere. After the reaction was complete, it was filtered through celite and washed with dichloromethane (200 ml). The obtained filtrate was concentrated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (petroleum ether: ethyl acetate 15: 1) to obtain 1.3 g of 2-methoxybenzaldehyde as a white solid (yield: 18.2%). LCMS: RT ═ 1.70min, [ M + H] + ＝137.11，calcd for C 8 H 8 O 2 ：136.15。
And C: preparation of (1E, 4E) -1, 5-bis (2-methoxyphenyl) pentan-1, 4-dien-3-one from 2-methoxybenzaldehyde
Figure BDA0003715356630000083
At room temperature, 2-methoxybenzaldehyde (1.3 g, 9.5 mmol) was dissolved in methanol (15 ml), followed by the addition of acetone (275.5 mg, 4.7 mmol) and cooling to 0 ℃ with stirring. Solid potassium methoxide (1.3 g, 19.0 mmol) was weighed out and added to the reaction solution in portions. After the addition was complete, the reaction was warmed to room temperature and stirred continuously until a large amount of yellow solid precipitated. After the reaction is completed, the reaction solution is filtered, a yellow solid is collected, and methanol is usedWashed twice (50 ml). The yellow solid was then dissolved in dichloromethane (300 ml), washed with water (80 ml × 2), washed with saturated brine (80 × 2), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting oil was recrystallized from methanol to give 786.8 mg of (1E, 4E) -1, 5-bis (2-methoxyphenyl) pentan-1, 4-dien-3-one as yellow crystals (yield 56.2%). LCMS: RT 4.28min, [ M + H ═] + ＝295.14，calcd for C 19 H 18 O 3 ：294.35。 1 H NMR(400MHz，CDCl 3 )δ8.12(d，J＝16.1Hz，2H)，7.68(dd，J＝7.7，1.7Hz，2H)，7.42(ddd，J＝8.6，7.4，1.7Hz，2H)，7.23(d，J＝16.1Hz，2H)，7.04(td，J＝7.5，1.1Hz，2H)，6.99(dd，J＝8.4，1.0Hz，2H)，3.97(s，6H)。
Comparative example 2:
step A: preparation of (E) -3- (2-methoxyphenyl) acrylic acid methyl ester from o-hydroxy trans-cinnamic acid
Figure BDA0003715356630000091
Ortho-hydroxy trans-cinnamic acid (10.0 g, 61.0 mmol), methyl iodide (34.6 g, 244.0 mmol) and anhydrous potassium carbonate (33.9 g, 244.0 mmol) were dissolved in acetonitrile (100 ml) at room temperature, followed by heating to 40 ℃ and stirring under closed conditions overnight. After completion of the reaction, the reaction was quenched by addition of water (50 ml), extracted with ethyl acetate (150 ml × 3), and the organic phases were combined, followed by washing with 1 mol/l aqueous hydrochloric acid (100 ml × 2), saturated brine (100 ml × 2), drying over anhydrous sodium sulfate, filtration and concentration under reduced pressure. 9.3 g of methyl (E) -3- (2-methoxyphenyl) acrylate as an oil were obtained and charged directly into the next step without further purification (yield: 79.5%). LCMS: RT 2.79min, [ M-OCH 3 ] + ＝161.00，calcd for C 10 H 9 O 2 ：161.18。
And B, step B: preparation of 2-methoxybenzaldehyde from (E) -3- (2-methoxyphenyl) acrylic acid methyl ester
Figure BDA0003715356630000092
Methyl (E) -3- (2-methoxyphenyl) acrylate (9.3 g, 48.4 mmol) was added to a 250 ml round bottom flask in an ice salt bath and dissolved in acetonitrile (100 ml) solution, after the temperature was reduced to about-10 ℃, ozone gas was bubbled into the suspension through the tube using an ozone generator and the ozone was bubbled for about 2 hours with stirring until the suspension became clear. After the reaction was completed, the reaction solution was blown with oxygen for 2 minutes, diluted with ethyl acetate (200 ml), and separated into layers with a separatory funnel, and the organic phase was collected. The aqueous phase was extracted with ethyl acetate (100 ml × 2) until no product remained in the aqueous phase. The organic phases were combined, washed with saturated aqueous sodium bicarbonate (150 ml. times.2) and saturated brine (150 ml. times.1). The organic phase was collected, dried over anhydrous sodium sulfate and finally concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (petroleum ether: ethyl acetate 15: 1) to give 4.1 g of 2-methoxybenzaldehyde as a white solid. (yield: 62.8%). LCMS: RT ═ 1.70min, [ M + H] + ＝137.11，calcd for C 8 H 8 O 2 ：136.15。
And C: preparation of (1E, 4E) -1, 5-bis (2-methoxyphenyl) pentan-1, 4-dien-3-one from 2-methoxybenzaldehyde
Figure BDA0003715356630000101
At room temperature, 2-methoxybenzaldehyde (4.1 g, 30.1 mmol) was dissolved in methanol (15 ml), followed by the addition of acetone (874.2 mg, 15.0 mmol) and cooling to 0 ℃ with stirring. Solid potassium methoxide (2.1 g, 30.1 mmol) was weighed out and added to the reaction solution in portions. After the addition was complete, the reaction was warmed to room temperature and stirred continuously until a large amount of yellow solid precipitated. After the reaction was complete, the reaction was filtered and a yellow solid was collected and washed twice with methanol (50 ml). The yellow solid was then dissolved in dichloromethane (300 ml), washed with water (80 ml × 2) and saturatedThe extract was washed with brine (80X 2), dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The resulting oil was recrystallized from methanol to give 553.9 mg of (1E, 4E) -1, 5-bis (2-methoxyphenyl) pentan-1, 4-dien-3-one as yellow crystals (yield 12.5%). LCMS: RT 4.28min, [ M + H ═] + ＝295.14，calcd for C 19 H 18 O 3 ：294.35。 1 H NMR(400MHz，CDCl 3 )δ8.12(d，J＝16.1Hz，2H)，7.68(dd，J＝7.7，1.7Hz，2H)，7.42(ddd，J＝8.6，7.4，1.7Hz，2H)，7.23(d，J＝16.1Hz，2H)，7.04(td，J＝7.5，1.1Hz，2H)，6.99(dd，J＝8.4，1.0Hz，2H)，3.97(s，6H)。
In conclusion, the yield of step B in comparative example 1 is as low as 18.2%, and both step A and step B need to be purified by silica gel column chromatography, which increases the cost and production period of the subsequent process. After the reaction of step B in comparative example 2 is completed, some pigment byproducts are extremely difficult to remove, and although the pigment byproducts are purified twice by silica gel column chromatography, the byproducts which cannot be detected by thin layer chromatography and LCMS greatly influence the reaction of the next step C, so that only a few products are separated out in step C. In all the embodiments, the step A can be purified cleanly only by reduced pressure distillation, the step B can be used for purifying the product only by simple extraction and washing, the step C can be recrystallized, the post-treatment is very simple to operate, and the method is high in overall yield and suitable for process production.

Claims (10)

1. A method for purifying high-purity curcumin analog with the structural formula shown in the specification
Figure FDA0003715356620000011
The method is characterized in that methanol is used as a solvent for recrystallization.
2. The method for purifying a high-purity curcumin analog as claimed in claim 1, wherein said high purity is more than 99%.
3. The method for purifying a high-purity curcumin analog as claimed in claim 1, wherein said high purity is a purity of more than 98%.
4. The method for purifying a high-purity curcumin analog as claimed in claim 1, wherein said high purity is more than 95% purity.
5. The method for purifying a high-purity curcumin analog as described in any one of the above claims, wherein the method for synthesizing the curcumin analog comprises the steps of: step 3), reacting 2-methoxybenzaldehyde with acetone, and adding an alkalizing agent;
and/or step 2) using methyl iodide as a methylation reagent to carry out methylation reaction on the salicylaldehyde to obtain a product 2-methoxybenzaldehyde;
and/or 1) reacting o-hydroxy trans-cinnamic acid with ozone to obtain salicylaldehyde.
6. The method for purifying a high-purity curcumin analog as claimed in claim 5, wherein: in the step 1), after the reaction is completed, fully blowing the reaction liquid by using oxygen, adding ethyl acetate for dilution, layering by using a separating funnel, and collecting an organic phase; extracting the aqueous phase with ethyl acetate until no product remains in the aqueous phase; mixing organic phases, washing with a saturated sodium bicarbonate solution and a saturated saline solution in sequence; the organic phase was collected and dried over anhydrous sodium sulfate.
7. The method for purifying a high-purity curcumin analog as claimed in claim 6, wherein the product dried over anhydrous sodium sulfate in the step 1) is subjected to distillation under reduced pressure to obtain colorless transparent liquid salicylaldehyde.
8. The method for purifying a high-purity curcumin analog as claimed in claim 5, wherein in the step 2), the molar ratio of salicylaldehyde to methyl iodide to anhydrous potassium carbonate is 1: 1 to 1: 4, and the reaction temperature is 25 to 50 ℃;
and/or in the step 2), the solvent is acetonitrile;
and/or extracting the product 2-methoxybenzaldehyde after the reaction in the step 2), drying the product by using anhydrous sodium sulfate, and directly putting the dried product into the next reaction.
9. The method for purifying a high-purity curcumin analogue as claimed in claim 5, wherein in the step 3), the dosage ratio of the 2-methoxybenzaldehyde to the acetone is (1-3): 1.
10. the method for purifying a high-purity curcumin analog as claimed in claim 5, wherein in the step 3), potassium methoxide is used as an alkalizing agent.
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