Process for preparing pyridine-2,3-dicarboxylic acid compounds
US4973695A · kind A · utility
25Cited by
2References
9Claims
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Key dates
| Filing date | Feb 10, 1989 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Feb 10, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D213/80
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing pyridine-2,3-dicarboxylic acid compounds of the following formula: ##STR1## wherein R.sup.1 and R.sup.3 are, identical or different, each a hydrogen atom or a lower alkyl group, R.sup.2 is a hydrogen atom, a lower alkyl group, or a phenyl-(lower)alkyl group which may have halogen atom or lower alkyl group on its phenyl ring, and R.sup.4 and R.sup.5 are, identical or different, each a lower alkoxy group. The compounds are useful as an intermediate for preparing agricultural chemicals and pharmaceuticals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.