Process for preparing flavonoids
US6706865B2 · kind B2 · utility
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Key dates
| Filing date | Nov 21, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Nov 21, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A simple and easy process for preparing pharmacologically useful flavonoid compound having reductase inhibitory effect, active oxygen extinguishing effect, carcinogenesis promotion inhibitory effect, anti-inflammatory effect, and so on. Particularly, a process for preparing the compound of the formula (I): wherein, R2 is a substituted or un-substituted phenyl group; R7 is a hydrogen atom or a hydroxyl group; and n is an integer of 1 to 4;by bonding a sugar derivative to catechins as the starting compound selectively via O-glycoside bond and then oxidizing the 4-position of flavanoid skeleton of the obtained compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.