反应详情

1-[2-(5,6-Difluorobenzimidazol-2-ylthio)ethyl]piperazine tris(trifluoroacetic acid) salt (4.00 g, 6.25 mmol) and potassium carbonate (31.26 mmol) were dissolved in acetonitrile (100 mL) and water (30 mL). While the solution was stirred under cooling with ice, 2-bromo-N-[2,4-bis(2,2,2-trifluoroethoxy)-6-methylpyridin-3-yl]acetamide (2.20 g, 5.22 mmol) was added thereto over 15 minutes. The temperature of the mixture was allowed to room temperature, and the mixture was stirred for 15 hours. Thereafter, the reaction mixture was diluted with water and then extracted with chloroform. The organic layer was washed with saturated brine and then dried over sodium sulfate anhydrate, followed by concentration under reduced pressure. The residue was purified through silica gel column chromatography (silica gel 150 g, hexane: acetone=4:1 to 2:1 to 1:1). The thus-obtained crystals were recrystallized from chloroform-hexane, to thereby yield 2-[4-[2-(5,6-difluorobenzimidazol-2-ylthio)ethyl]piperazin-1-yl]-N-[2,4-bis(2,2,2-trifluoroethoxy)-6-methylpyridin-3-yl]acetamide (3.04 g, yield 91%) as a pale yellow powder.

1. additionwas added
2. customwas allowed to room temperature
3. stirringthe mixture was stirred for 15 hours
4. extractionextracted with chloroform
5. washThe organic layer was washed with saturated brine
6. dry with materialdried over sodium sulfate anhydrate
7. concentrationfollowed by concentration under reduced pressure
8. customThe residue was purified through silica gel column chromatography (silica gel 150 g, hexane: acetone=4:1 to 2:1 to 1:1)
9. customThe thus-obtained crystals were recrystallized from chloroform-hexane