Process for the preparation of a 3(2H)-pyridazinone-4- substituted amino 5-chloro derivative
US6800758B1 · kind B1 · utility
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5Claims
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Assignee
Inventors
Key dates
| Filing date | Feb 9, 2001 |
| Grant date | Oct 5, 2004 |
| Priority date | — |
| Expiry date | Feb 9, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D237/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to novel processes for the preparation of 5-chloro-4-{3-[N-[2-(3,4-dimethoxyphenyl)-ethyl]-N-methylamino]-propylamino-3(2H) pyridazinone of formula (I) and the pharmaceutically acceptable acid addition salts thereof. An important feature of the invention is using 3,4,5-trichloropyridazone as starting substance of the synthesis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.