1-[5-(tert-Butyldimethylsilanyloxymethyl)pyridin-2-yl]cyclopropylamine (190 mg) was dissolved in pyridine (2 ml), acetic anhydride (0.13 ml) and 4-dimethylaminopyridine (17 mg) were added, and the mixture was stirred at room temperature for 4 hr. Methanol (2 ml) was added and the mixture was stirred for about 10 min. The solvent was evaporated, and the residue was purified by column chromatography (Yamazen HI-FLASH™ COLUMN size L, elution solvent: hexane/ethyl acetate) to give the title compound (158 mg).
