m-Chloroperbenzoic acid → 3-Methyl-4-(propylsulfinyl)-1-(2-pyridinyl)-1H-pyrazolo[3,4-b]quinoline

Participants

Reaction Steps

A solution of m-chloroperbenzoic acid (0.96 g, 5.6 mmol) in chloroform (55 mL) was added dropwise to a solution of 3-methyl-4-propylsulfanyl-1-(2-pyridinyl)-1H-pyrazolo[3,4-b]quinoline (1.54 g, 4.6 mmol) in chloroform (55 mL) at a temperature of lower than 0° C., and the mixture was stirred at the same temperature for another 2.5 hours. The reaction solution was washed with an aqueous saturated sodium bicarbonate solution and saturated brine, and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue thus obtained was purified by silica gel column chromatography (hexane:chloroform:ethyl acetate=2:1:1 to 1:1:1) to give the title compound (0.84 g, 52% yield).

Provenance & Evidence