Water → N-(1,1-Dioxido-1-benzothien-6-yl)-4-(3-phenyl-1,2,4-thiadiazol-5-yl)piperazine-1-carboxamide

Participants

Reaction Steps

A mixed solution of 2,2,2-trichloroethyl (1,1-dioxido-1-benzothien-6-yl)carbamate (263 mg, 0.738 mmol), 1-(3-phenyl-1,2,4-thiadiazol-5-yl)piperazine (200 mg, 0.811 mmol) and diisopropylethylamine (0.129 ml, 0.811 mmol) in dimethyl sulfoxide (2.5 ml) was stirred at 70° C. for 3 hours. Water was poured to the reaction mixture, and the resulting solution was extracted with ethyl acetate. The extract was washed with water and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1) and recrystallized from a mixed solvent of hexane and tetrahydrofuran to give 106 mg (31.7%) of the desired product as a solid.

Provenance & Evidence