Ethyl Acetate → 5-[4-(3-Methanesulfinylbenzoylamino)phenyl]-1H-naphtho[1,2-b][1,4]diazepine-2,4(3H,5H)-dione

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Reaction Steps

5-[4-[3-(Methylthio)benzoylamino]phenyl]-1H-naphtho[1,2-b][1,4]diazepine-2,4(3H,5H)-dione (20 mg, 0.043 mmol) obtained in Example 126 was dissolved in dimethylformamide (0.4 mL), the solution was added with m-chloroperbenzoic acid (ii mg, 0.03 mmol) at −20° C., and the mixture was stirred for 30 minutes. After completion of the reaction, the reaction mixture was added with ethyl acetate at −20° C., the organic layer was washed with saturated aqueous sodium hydrogencarbonate, water, and saturated brine. The solvent of the organic layer was evaporated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (chloroform/methanol=100/1) to obtain the title compound (8 mg, yield 38%).

Provenance & Evidence