Highly pure cilostazol and an improved process for obtaining same
US7524960B2 · kind B2 · utility
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10References
24Claims
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Key dates
| Filing date | Mar 16, 2005 |
| Grant date | Apr 28, 2009 |
| Priority date | — |
| Expiry date | May 30, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D401/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel process for preparing highly pure cilostazol, effected by reacting 6-hydroxy-3,4-dihydroquinolinone and 5-(4-chlorobutyl)-1-cyclohexyl-1H-tetrazole in the presence of a hydrated inorganic base, is disclosed. Further disclosed is highly pure cilostazol, and particularly highly pure cilostazol that is substantially free of 6-[4-(1-cyclohexyl-1H-tetrazol-5-yl)-butoxy]-1-[4-(1-cyclohexyl-1H-tetrazol-5-yl)-butyl ]-3,4-dihydro-1H-quinolin-2-one.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.