Method for extracting and purifying bisbenzylisoquinolines
US8609844B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Nov 4, 2010 |
| Grant date | Dec 17, 2013 |
| Priority date | — |
| Expiry date | Sep 23, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07B63/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for purifying extracted crude d-tetrandrine by dissolving the crude d-tetrandrine powder in ethanol, treating the solution with a decolorizing agent, filtering, reducing the filtered solution under heat and vacuum, cooling the solution, filtering it and drying the filtered cake to yield substantially pure d-tetrandrine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.