Monomethylation of nitrogeneous heterocycles
US7022845B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Jul 31, 2003 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Oct 1, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D249/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the monomethylation of nitrogenous heterocycles having at least one nitrogen atom bonded to a hydrogen atom by reacting the nitrogenous heterocycle with dimethyl carbonate at a temperature of between 100° and 200° C. and a pressure of between 0.93×105 Pa and 1.07×105 Pa while methanol produced during the reaction is distilled off as it is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.