Process for preparing 1-methylindazole-3-carboxylic acid
US7060841B2 · kind B2 · utility
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4References
9Claims
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Assignee
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Key dates
| Filing date | Jun 3, 2003 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | Apr 13, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D231/56
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention provides a process for preparing 1-methylindazole-3-carboxylic acid of formula (I):which comprises reacting a methylating agent with indazole-3-carboxylic acid of formula (VI):in the presence of an alkaline earth metal oxide or alkoxide in an appropriate solvent. Also provided is a process for producing Granisetron, using the method of the present invention for producing 1-methylindazole-3-carboxylic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.