Preparation method of leonurine and aspirin conjugate

A technology of leonurine and aspirin, which is applied in the field of preparation of leonurine and its analogs and aspirin conjugates, can solve the problems of low yield of esterification reaction, difficulty in operation, difficulty in purification and the like, and saves raw materials and shortens the reaction. effect of time

Inactive Publication Date: 2016-11-23
FUDAN UNIV
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Problems solved by technology

[0004] Studies have disclosed a variety of methods for the synthesis of motherwortine. Currently, the more commonly used synthetic routes include: using syringic acid and S-methylthiourea as starting materials, and preparing motherwort by acetylation, esterification, amidation, and hydrogenation reduction. Alkali, the disadvantage of its e

Method used

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  • Preparation method of leonurine and aspirin conjugate
  • Preparation method of leonurine and aspirin conjugate
  • Preparation method of leonurine and aspirin conjugate

Examples

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Effect test

Embodiment 1

[0034] The synthesis (3) of embodiment 1 acetylated syringic acid

[0035]

[0036] Using acetic anhydride (Ac 2 )O as an acylating agent, controlling the reaction time can make the productive rate reach more than 90%; the specific operation is: 100ml three-necked flask, add N2 protection, syringic acid (19.8g, 0.1mol) is added in 100ml dichloromethane, slowly drop Add 30ml (0.2mol) of triethylamine, slowly add 15ml (0.15mol) of acetic anhydride dropwise after all the samples are dissolved, monitor the progress of the reaction by TLC, after 12 hours of reaction, concentrate the reaction solution to 30ml by vacuum filtration and rotary evaporation, dropwise add 1N concentrated hydrochloric acid until the pH was 5, a large amount of white crystals were sucked out at this time, and the crude product of acetosyringic acid (22.7 g, 95%) was obtained by suction filtration and drying;

[0037] [In this example, 1N hydrochloric acid can be used to adjust the pH to 3, and then use ...

Embodiment 2B

[0038] The synthesis (1) of embodiment 2 Boc protection guanidino groups

[0039]

[0040] Dissolve S-methylisothiouronium sulfate (6.95g, 0.025mol) in 50ml of water, add 13.8ml (0.1mol) of triethylamine, after the sample is completely dissolved, to obtain solvent I, take (Boc)2O(21.8 g, 0.1mol) was dissolved in 10ml tetrahydrofuran, slowly added dropwise to solvent I, and 0.05g DMAP was added to the mixed solvent, reacted for 96h, and TLC monitored the reaction progress. Place DCM and water in a separatory funnel and extract 3 times, collect the DCM layer and concentrate to obtain a crude product, purify by silica gel column chromatography, and elute with petroleum ether: ethyl acetate (40:1) to obtain Boc-protected S-methyl isosulfide Urea (6.5 g, 91%).

Embodiment 34

[0041] The synthesis of embodiment 34-guanidinobutanol (2)

[0042]

[0043] Dissolve Boc-protected S-methylisothiourea (14.5 g, 0.05 mol) in anhydrous DMF, stir at room temperature for 1 h, and place the reaction vessel in a cold well (-5°C) after it is completely dissolved. Add 4-aminobutanol (6.75g, 0.075mo) at the bottom, take it out after 10min and react at room temperature for 3h, monitor the progress of the reaction by TLC, after the raw material point of S-methylisothiourea disappears, spin the reaction solution and place it in a separatory funnel DCM and water were extracted three times, and the concentrated DCM layer was collected and purified by silica gel column chromatography, eluting with petroleum ether: ethyl acetate (1:1) to obtain 4-guanidinobutanol (11.77 g, 71%).

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Abstract

The invention belongs to the field of medicinal chemistry, and relates to a synthesizing method of leonurine and aspirin conjugate. The method comprises the steps that syringic acid, S-methylisothiourea and aspirin serve as starting materials, reactions of acetylation, BOC protection, amidation, deacetylation and the like are conducted, and corresponding structure segments are obtained; dilauryl hydrogen phosphite, 4-dimethylaminopyridine and 4-toluenesulfonic acid are used together to serve as a condensation catalyst to connect the three segments, de-BOC protection is conducted on trifluoroacetic acid, and a target compound is obtained. The synthesizing method of the leonurine and aspirin conjugate is easy and convenient to operate, mild in condition, simple in post treatment and capable of increasing the yield of the intermediate leonurine product; the total yield of the prepared leonurine and aspirin conjugate is 25.27%, a pharmacological activity test is conducted, it is shown through the result that very good antioxidant and anti-apoptosis effects at a cellular level are achieved, and the effect on protecting myocardial cells is exact.

Description

technical field [0001] The invention belongs to the field of medicinal chemistry, and relates to a conjugate of natural alkaloid leonurine and a non-steroidal anti-inflammatory drug aspirin, in particular to a preparation method of a conjugate of leonurine and its analogues and aspirin. Background technique [0002] In the prior art, Dongkai Leonurine is a specific alkaloid in Lamiaceae plant Leonurus, and relevant studies have shown that it has the ability to inhibit external Ca 2+ Influx and Ca 2+ Release and improve hemorheology, anti-oxidation, anti-apoptosis and other cardioprotective effects, and can promote the release of NO in vivo and in vitro. [0003] It is known that aspirin, also known as acetylsalicylic acid, is a common drug used clinically for analgesia and anti-inflammation. In recent years, studies have shown that aspirin can inhibit platelet aggregation, and has certain preventive and therapeutic effects on ischemic heart disease and angina pectoris. It ...

Claims

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Application Information

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IPC IPC(8): C07C277/08C07C279/08C07C275/10C07C273/18C07C235/52C07C231/12A61P39/06A61P9/00
Inventor 朱依谆古险峰高欢
Owner FUDAN UNIV
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