Method of preparing pyridazinone derivatives
US5189163A · kind A · utility
1Cited by
6References
8Claims
0Family size
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Key dates
| Filing date | Mar 13, 1992 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Mar 13, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01N43/58
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for the preparation of a pyridazinone derivative having the general formula I: ##STR1## where: R.sup.1 is a phenyl group, optionally substituted, R.sup.2 is H, alkyl or carboxy, R.sup.3 is H, alkyl or alkoxy and R.sup.4 is alkyl; said method comprising reacting a hydrazone of glyoxylic acid halide having the formula VII: ##STR2## in which X is halogen, with an ester of formula VIII; ##STR3## in the presence of an alkaline earth base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.