Triethylamine → 4-(4-Methanesulfonyloxyphenyl)-7-[1-(tert-butoxycarbonyl)-5-(piperidinomethyl)indol-2-yl]isoindolinone

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Reaction Steps

4-(4-Hydroxyphenyl)-7-[1-(tert-butoxycarbonyl)-5-(piperidinomethyl)indol-2-yl]isoindolinone (178 mg, 0.330 mmol) was suspended in dichloromethane (14 mL), and the suspension was added with triethylamine (0.092 mL, 0.66 mmol) and methanesulfonyl chloride (0.031 mL, 0.40 mmol) under ice-cooling, followed by stirring for 2.5 hours. The reaction mixture was filtered, and the filtrate was added with water and extracted with ethyl acetate and chloroform. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by preparative thin-layer chromatography (chloroform/methanol/7 mol/L ammonia-methanol solution=10/0.5/0.5) to obtain 4-(4-methanesulfonyloxyphenyl)-7-[1-(tert-butoxycarbonyl)-5-(piperidinomethyl)indol-2-yl]isoindolinone (53.4 mg, yield 26%).

Provenance & Evidence