Unsaturated esters of 4-hydroxy-2-quinolinone-3-carboxylic acids and salts thereof
US4119720A · kind A · utility
18Cited by
1References
78Claims
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Key dates
| Filing date | Jul 6, 1977 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Jul 6, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D215/56
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Disclosed are compounds which are unsaturated esters of 4-hydroxy-2-quinolinone-3-carboxylic acids, e.g., 1-allyl-6,7-dimethoxy-4-hydroxy-2-quinolinone-3-carboxylic acid allyl ester, useful as anti-allergic agents, and prepared by reacting an isatoic anhydride with an alkali metal salt of a malonic acid unsaturated ester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.