反应详情

A mixed solution of 2,2,2-trichloroethyl pyridin-3-ylcarbamate (235 mg, 0.872 mmol), 1-[3-(2-thienyl)-1,2,4-thiadiazol-5-yl]piperazine (200 mg, 0.793 mmol) and diisopropylethylamine (0.152 ml, 0.872 mmol) in dimethyl sulfoxide (2.5 ml) was stirred at 80° 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 the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate) and recrystallized from a mixed solvent of hexane and tetrahydrofuran to give 109 mg (37.1%) of the desired product as a solid.

1. extractionthe resulting solution was extracted with ethyl acetate
2. washThe extract was washed with water
3. distillationthe solvent was distilled off under reduced pressure
4. customThe residue was purified by silica gel column chromatography (ethyl acetate)
5. customrecrystallized from a mixed solvent of hexane and tetrahydrofuran