p-Bromobenzenesulfonyl chloride → 4-(4-Bromobenzenesulfonyl)-1-{[4-ethoxycarbonylamino-1-(2-methyl-4-pyridyl)-4-piperidinyl]methyl}-2-piperazinone

Beteiligte Stoffe

Reaktionsschritte

Triethylamine (400 mg) was added to a solution of 1-{[4-ethoxycarbonylamino-1-(2-methyl-4-pyridyl)-4-piperidinyl]methyl}-2-piperazinone hydrochloride (440 mg) obtained in Reference Example 11 in dichloromethane (15 ml), 4-bromobenzenesulfonyl chloride (255 mg) was added at 0° C., and the mixture was stirred at room temperature for 1 hour. An aqueous sodium carbonate solution was added to the reaction solution, the material was extracted with dichloromethane, dried, concentrated, and purified by silica gel column chromatography (dichloromethane:10% aqueous ammonia-containing methanol=20:1) to obtain the title compound (403 mg) as colorless crystals.

Herkunft & Nachweise