5-chloro-s-triazolo[4,3-a]-pyridine-7-carboxylic acids, useful as antiallergic agents
US4650872A · kind A · utility
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Key dates
| Filing date | Aug 1, 1985 |
| Grant date | Mar 17, 1987 |
| Priority date | — |
| Expiry date | Aug 1, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P37/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
5-Chloro-3-(substituted)-s-triazolo[4,3-a]pyridine-7-carboxylic acids useful as antiallergic agents are described herein. The compounds are prepared from an appropriate acyl 6-chloro-2-hydrazinopyridine, substituted at the 4-position with a trichloromethyl group or a cyano group, by reaction with polyphosphoric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.