反应详情

A mixture of 5-[4-[6-(3-aminophenoxy)-1-methyl-1H-benzimidazol-2-ylmethoxy]benzyl]thiazolidine-2,4-dione dihydrochloride (400 mg), n-hexyl isocyanate (280 mg), triethylamine (153 mg) and anhydrous N,N-dimethylformamide (8 ml) was stirred at room temperature for 7 hours and then allowed to stand overnight. The reaction mixture was concentrated and partitioned between ethyl acetate and water. The extract was washed with saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate and then concentrated. The residue was chromatographed on a silica gel column using ethyl acetate/n-hexane=3:1→4:1→ethyl acetate→ethyl acetate:methanol=15:1 as the eluant. The product was recrystallized from ethyl acetate to afford the title compound (298 mg, mp 143.7-146.9° C.).

1. waitto stand overnight
2. concentrationThe reaction mixture was concentrated
3. custompartitioned between ethyl acetate and water
4. washThe extract was washed with saturated aqueous sodium chloride solution
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated
7. customThe residue was chromatographed on a silica gel column
8. customThe product was recrystallized from ethyl acetate