Potassium Cyanide → 2-(4-(Trifluoromethyl)benzyl)-7-(4-chlorophenyl)-3-oxo-2,3-dihydro-[1,2,4]triazolo[4,3-b]pyridazine-8-carbonitrile

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Reaction Conditions

Reaction Steps

A suspension of 2-(4-(trifluoromethyl)benzyl)-8-chloro-7-(4-chlorophenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one, (43.8 mg, 0.10 mmol), prepared as described in example 361G, and KCN (33 mg, 0.5 mmol) in dry 1-methyl-2-pyrrolidinone (1 mL) was heated at 120° C. for 2 h under argon. HPLC/MS analysis indicated complete reaction. The reaction mixture was concentrated under vacuum with co-evaporation of toluene (5 mL×2) to obtain a yellow solid. The crude product was purified by reversed phase preparative HPLC (C-18, MeOH/H2O gradient, 0.1% TFA) to obtain title compound (31 mg, 72%), 2-(4-(trifluoromethyl)benzyl)-7-(4-chlorophenyl)-3-oxo-2,3-dihydro-[1,2,4]triazolo[4,3-b]pyridazine-8-carbonitrile as a yellow solid. MS [M+H]+ 430; HPLC retention time=3.76 min.

Provenance & Evidence