Process for the preparation of pyrazolo[4,3-d]pyrimidin-7-one compounds and intermediates thereof
US6809200B2 · kind B2 · utility
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3Claims
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Key dates
| Filing date | Jul 26, 2001 |
| Grant date | Oct 26, 2004 |
| Priority date | — |
| Expiry date | Jul 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D487/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process is provide for the preparation of compounds of formula (I) herein comprising reacting a compound of formula (III), (IV) or (V) wherein the variables are as defined in the specification. The reaction is conducted in the presence of −OR3 and a hydroxide trapping agent or in the case of compounds of formula (IV) reacting in the presence of an auxiliary base and a hydroxide trapping agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.