反应详情

0.32 ml triethylamine is added to a solution of 0.42 g 2-(5-Piperidin-4H[1,2,4]triazol-3-yl)-pyridine*2HCl (prepared from tert-butyl 4-(hydrazinocarbonyl)piperidine-1-carboxylate and pyridine-2-carbonitrile according to a procedure described in U.S. Pat. No. 4,011,218 or WO2005100344) in 10 ml methanol. To this solution a solution of 0.37 g 4-(7-methoxy-6-phenylpyrazolo[1,5-a]pyrimidin-5-yl)benzaldehyde in 10 ml DMF is added, followed by 0.15 ml glacial acetic acid and 0.43 g NaBH(OAc)3. The resulting mixture is stirred at room temperature. Four additional portions of 2 equivalents NaBH(OAc)3 are added after 1, 2, 3 and 7 hours. The solvent is removed by evaporation after 20 h and the residue is purified by chromatography on silica gel (dichloromethane/[dichloromethane+7M NH3 in methanol]) to yield the product.

1. customThe solvent is removed by evaporation after 20 h
2. customthe residue is purified by chromatography on silica gel (dichloromethane/[dichloromethane+7M NH3 in methanol])
3. customto yield the product