反应详情

To a solution of 5-chloro-3-(2-thienyl)-1,2,4-thiadiazole (4.80 g, 23.7 mmol) and tert-butyl piperazine-1-carboxylate (4.41 g, 23.7 mmol) in dimethylformamide (50 ml) was added triethylamine (13.2 ml, 94.7 mmol) at room temperature, and the mixture was stirred at room temperature for 1 hour. 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 recrystallized from a mixed solvent of hexane and tetrahydrofuran to give 4.33 g (51.9%) of the desired product as a solid.

1. extractionthe resulting solution was extracted with ethyl acetate
2. washThe extract was washed with water
3. dry with materialdried over anhydrous magnesium sulfate
4. distillationthe solvent was distilled off under reduced pressure
5. customThe residue was recrystallized from a mixed solvent of hexane and tetrahydrofuran