4-Hydroxy-pyrido[2,3-b]pyridine-2(1H)-one-3-carboxylic acids and esters
US4128649A · kind A · utility
10Cited by
8References
37Claims
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Key dates
| Filing date | Jun 29, 1977 |
| Grant date | Dec 5, 1978 |
| Priority date | — |
| Expiry date | Jun 29, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D471/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Anti-allergic 4-hydroxy-pyrido[2,3-b]pyridine-2(1H)-one-3-carboxylic acids and esters are prepared by reacting a 3,4-dihydro-1,3-dioxo-1H-pyrido[2,3-d][1,3]oxazine (a 3-azaisatoic anhydride) with an alkali metal salt of a malonic ester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.