Method for preparing acyclovir 2/3 hydrate
US9084792B2 · kind B2 · utility
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Key dates
| Filing date | Mar 17, 2010 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Jul 2, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D473/18
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Preparation of acyclovir 2/3 hydrate comprises mixing acyclovir with water at weight ratio of 1:5˜50, dissolving at 50˜100° C., filtering, cooling filtrate at 0˜30° C. to precipitate crystal, collecting the crystal by filtration, and drying the crystal at 0˜150° C. for 0.5˜24 hours to obtain acyclovir 2/3 hydrate. The preparation process is simple and suitable for industrial production. The prepared product has good and stable crystal form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.