反应详情

A mixture of 5-[4-[6-(4-aminophenoxy)-1-methyl-1H-benzimidazol-2-ylmethoxy]benzyl]thiazolidine-2,4-dione dihydrochloride (400 mg), p-toluenesulfonyl chloride (153 mg), triethylamine (234 mg) and anhydrous N,N-dimethylformamide (8 ml) was stirred at room temperature for 2.5 hours. 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=2:1→4:1 as the eluant and the product was recrystallized from a mixture of ethyl acetate and diisopropyl ether to afford the title compound (237 mg, mp 132.0-135.6° C.).

1. concentrationThe reaction mixture was concentrated
2. custompartitioned between ethyl acetate
3. washThe extract was washed with saturated aqueous sodium chloride solution
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated
6. customThe residue was chromatographed on a silica gel column
7. customn-hexane=2:1→4:1 as the eluant and the product was recrystallized from a mixture of ethyl acetate and diisopropyl ether