4-Hydroxy-3-nitro-pyrido[2,3-B]pyridine-2(1H)-ones
US4264602A · kind A · utility
6Cited by
4References
10Claims
0Family size
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Inventor
Key dates
| Filing date | Jul 21, 1976 |
| Grant date | Apr 28, 1981 |
| Priority date | — |
| Expiry date | Jul 21, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D471/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Anti-allergic 4-hydroxy-3-nitro-pyrido[2,3-b]pyridines-2(1H)-ones are prepared by reacting a 3,4-dihydro-1,3-dioxo-1H-pyrido[2,3-d][1,3]oxazine (a 3-azaisatoic anhydride) with the carbanion resulting from the reaction of nitro acetic acid alkyl esters with a proton abstracting agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.