C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
167/231, 260/276
C07D 495/04 (2006.01) A61K 31/44 (2006.01)
Patent
CA 1293257
ABSTRACT (1H-Tetrazol-5-yl)thienopyridinones and related compounds which have the formula Image wherein Th is a thiophene fused to the pyridine ring and n is 0, 1 or 2; or a pharmaceutically acceptable salt thereof, and which are useful as antiallergic agents are described herein. The compounds are pre- pared by the reaction of an appropriate cyanoketone of the formula Image wherein Th and n are defined as above, with ammonium chloride and an azide in an inert solvent. Sodium azide is a preferred azide although other alkali metal azides could be used. A preferred solvent is dimethylformamide.
492239
Merrell Dow Pharmaceuticals Inc.
Osler Hoskin & Harcourt Llp
LandOfFree
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