5-(2-Chlorophenyl)-4-(4-chlorophenyl)-2-hydrazinylpyridine → 6-(2-chlorophenyl)-7-(4-chlorophenyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

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Reaction Steps

The title compound (190 mg, 88% yield) as a yellow foam was prepared from 5-(2-chlorophenyl)-4-(4-chlorophenyl)-2-hydrazinylpyridine (200 mg, 0.61 mmol) in a manner analogous to that in which 6-(2-chlorophenyl)-7-(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (Example 1G) was prepared. HPLC/MS: retention time=3.83 min, [M+H]+=356.1.

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