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Under nitrogen atmosphere, to a solution of oxalyl chloride (16.0 mL, 180 mmol) in dichloromethane (200 mL) was added dimethyl sulfoxide (30.0 mL, 0.420 mol) at −78° C., and the mixture was stirred for 30 min. To the reaction mixture was added a solution of (2-methyl[1,2,4]triazolo[1,5-a]pyridin-8-yl)methanol (23.0 g, 0.141 mmol) in dichloromethane (82 mL), and the mixture was stirred for 2 hr. To the reaction mixture was added triethylamine (99.0 mL, 0.710 mol) at −78° C., and the mixture was stirred for 1 hr and warmed to room temperature. After concentration under reduced pressure, the residue was purified by silica gel column chromatography (methanol/ethyl acetate=1/10) to give the title compound (19.0 g, yield 84%).

1. stirringthe mixture was stirred for 2 hr
2. stirringthe mixture was stirred for 1 hr
3. concentrationAfter concentration under reduced pressure
4. customthe residue was purified by silica gel column chromatography (methanol/ethyl acetate=1/10)