C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
167/225, 260/271
C07D 471/04 (2006.01) A61K 31/435 (2006.01)
Patent
CA 1302412
ABSTRACT OF THE DISCLOSURE 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. C-30046
514803
Merrell Dow Pharmaceuticals Inc.
Osler Hoskin & Harcourt Llp
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