Process for the preparation of N-(amino-4, 6-dihalo-pyrimidine) formamides
US6716981B2 · kind B2 · utility
8Cited by
4References
11Claims
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Key dates
| Filing date | May 31, 2001 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | May 31, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P31/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of a 2,5-diamino-4,6-dihalopyrimidine of the formula: in which X is a halogen atom, comprising reacting 2,5-diamino-4,6-dihydroxypyrimidine or its salt of the formula: with a phosphorus oxyhalide and a quaternary ammonium halide or an amine in a halogenated hydrocarbon as a solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.