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To a solution of 3-[2-(2-oxocyclohexyl)-3-oxo-2,3-dihydropyridazin-6-yl]-2-phenylpyrazolo[1,5-a]pyridine (384 mg) and tosylmethyl isocyanide (430 mg) in 1,2-dimethoxyethane (4 ml) was added dropwise a solution of potassium tert-butoxide (448 mg) in a mixture of 1,2-dimethoxyethane and tert-butanol (1:1, 2 ml) at 0° C. The reaction mixture was stirred at 0° C. for 1 hour and at room temperature for 30 minutes. Then, it was partitioned between water and ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate, and evaporated in vacuo. The crude product was crystallized from diethyl ether to give yellow crystals of 3-[2-(2-cyanocyclohexyl)-3-oxo-2,3-dihydropyridazin-6-yl]-2-phenylpyrazolo[1,5-a]pyridine (0.12 g).

1. customThen, it was partitioned between water and ethyl acetate
2. washThe organic layer was washed with brine
3. dry with materialdried over anhydrous sodium sulfate
4. customevaporated in vacuo
5. customThe crude product was crystallized from diethyl ether