Method for synthesizing 5,6,4'-trihydroxyflavone-7-O-D-glucuronic acid

A technology of trihydroxyflavone and glucuronic acid, applied in chemical instruments and methods, sugar derivatives, sugar derivatives, etc., can solve the problems of long synthetic route and low yield, etc.

Active Publication Date: 2009-09-23
四川抗菌素工业研究所有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cui et al. (JIAN-Mei Cui, GANG Fang, YA-Bo Duan.Total synthesis of scutellarin-7-O-Glucuronide.Journal of Asian Natural Products Research.2005, 7(4):655-660) using the Baker-Venkataraman method The t

Method used

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  • Method for synthesizing 5,6,4'-trihydroxyflavone-7-O-D-glucuronic acid
  • Method for synthesizing 5,6,4'-trihydroxyflavone-7-O-D-glucuronic acid
  • Method for synthesizing 5,6,4'-trihydroxyflavone-7-O-D-glucuronic acid

Examples

Experimental program
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Example Embodiment

[0015] Example 1

[0016] Take 1.84g 3,4,5-trimethoxyphenol and 2.7g p-methoxycinnamic acid chloride, and place 20mL BF 3 -Et 2 O solution, make it fully dissolved, add 2g 4A molecular sieve, heat to reflux for 15 minutes, stop heating, filter, recrystallize with petroleum ether-ethyl acetate (3:1) to obtain 9-hydroxy-5,6,7,4 '-Tetramethoxychalcone 3.13g, the transfer rate of this step is 91%.

[0017] Take 3.44g 9-hydroxy-5,6,7,4'-tetramethoxychalcone, 200mg iodine, dissolve it in 25mL DMSO, reflux for 2 hours, then carefully pour it into 200g crushed ice, filter, and precipitate Use 20% Na 2 SO 3 It was washed and recrystallized with petroleum ether-ethyl acetate (10:1) to obtain 2.98 g of 5,6,7,4'-tetramethoxyflavonoids with a transfer rate of 87%.

[0018] Take 3.42g of 5,6,7,4'-tetramethoxyflavone, add 5ml of 47% HBr, 10ml of glacial acetic acid, mix well, heat to reflux for 18 hours, then carefully pour 200g of crushed ice to obtain a yellow precipitate. The precipitate was ...

Example Embodiment

[0024] Example 2

[0025] Purification of the target product

[0026] Take 100g of the whole product, add 1000mL pure water, adjust the pH value to 7 with 30% sodium hydroxide solution, make it completely dissolved, filter, and add 8 times acetone to the filtrate at 25℃ for precipitation, and stir while adding acetone , Make the precipitation complete, let stand for 12 hours, filter, add acetone to wash three times, then move the precipitate to another container, add 6 times the amount of 40% acetone, stir well, then add 25% hydrochloric acid to adjust the pH to 1 ~2, stand for 10 hours, suction filter, wash with water to neutrality, add ethanol to wash once, and dry to obtain refined products. HPLC analysis showed that the content of 5,6,4'-trihydroxyflavone-7-O-D-glucuronic acid in the obtained sample was 99.25%.

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Abstract

The invention discloses a chemical method for preparing 5,6,4'-trihydroxyflavone-7-O-D-glucuronic acid to solve problems of unavailable raw materials, long synthetic route and low synthesis yield in the existing synthetic method. The method comprises a plurality of chemical reaction steps: first, taking 3,4,5-trimethoxy phenol and p-methoxy cinnamoyl chloride as raw materials to construct a chalcone structure by a Friedel-Crafts acylation reaction, and cycloetherifying to obtain a flavone parent substance; then protecting and selectively deprotecting phenolic hydroxyl of the flavone parent substance, and glycosylating 7-phenolic hydroxyl; and finally removing a protective group to obtain the target compound. The obtained product has a beta-steric configuration. The method can be used for preparing high-purity and high-quality 5,6,4'-trihydroxyflavone-7-O-D-glucuronic acid products.

Description

Technical field: [0001] The invention relates to the field of medicinal chemistry, in particular to a method for synthesizing 5,6,4'-trihydroxyflavone-7-O-D-glucuronic acid. Background technique: [0002] In natural medicines, flavonoids are the most common type of flavonoids, accounting for more than a quarter of the total number of flavonoids, and they have obvious structural diversity. It has been found that flavonoids have a variety of physiological activities, mainly including: anti-cardio-cerebrovascular disease, anti-inflammatory, anti-liver virus, liver protection, anti-bacterial, anti-cancer, and anti-oxidant effects. Among them, 5,6,4’-trihydroxyflavone-7-O-D-glucuronic acid, also known as scutellarin or scutellarin, has a structure such as Figure one Shown), has the effect of reducing cerebrovascular resistance, improving cerebral blood circulation, increasing cerebral blood flow and anti-platelet aggregation. At present, natural sources of 5,6,4'-trihydroxyflavone-7-...

Claims

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Application Information

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IPC IPC(8): C07H17/07C07H1/00
CPCY02P20/55
Inventor 何正有刘君焱杨放姚洁李蔷薇熊伟张建强邓小宽
Owner 四川抗菌素工业研究所有限公司
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