To a solution of 6-(5-{1-[4-(cyclopropylsulfonyl)phenyl]-2-(tetrahydro-2H-pyran-4-yl)ethyl}-1H-pyrrol-2-yl)pyridin-3-ol (0.052 g) in acetone (5 mL) were added chloroacetone (0.01 mL), potassium carbonate (18 mg) and potassium iodide (2 mg), and the mixture was heated under reflux for 11 hr. A saturated aqueous ammonium chloride solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed successively with water and saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=20:80-100:0, volume ratio) to give the title compound (0.038 g, yield 64%) as a colorless amorphous solid. MS: 509 (MH+).
