Triethylamine → 4-(7-bromo-2H-benzopyran-3-sulfonyl)-1-{[4-ethoxycarbonylamino-1-(2-methyl-4-pyridyl)-4-piperidinyl]methyl}-2-piperazinone

Participants

Reaction Steps

Triethylamine (253 mg) was added to a solution of 1-{[4-ethoxycarbonylamino-1-(2-methyl-4-pyridyl)-4-piperidinyl]methyl}-2-piperazinone hydrochloride (258 mg) in dichloromethane (15 ml), 7-bromo-2H-benzopyran-3-sulfonyl chloride (233 mg) was added at 0° C., and the mixture was stirred at room temperature for 1 hour. To the reaction solution was added an aqueous sodium carbonate solution, the mixture was extracted with dichloromethane, dried, concentrated, and purified by column chromatography (dichloromethane:10% aqueous ammonia-containing methanol=20:1) to obtain colorless amorphous 4-(7-bromo-2H-benzopyran-3-sulfonyl)-1-{[4-ethoxycarbonylamino-1-(2-methyl-4-pyridyl)-4-piperidinyl]methyl}-2-piperazinone (169 mg).

Provenance & Evidence