反应详情

A mixture of ethyl 4,5-dihydro-8-methylthio-2-phenylthieno[3,4-e]benzimidazole-6-carboxylate (0.50 g), a 10% (w/w) ammonia solution (30 ml) in methanol and tetrahydrofuran (30 ml) was heated in a sealed tube at 100° C. for 3 days. The reaction mixture was poured over water and extracted with ethyl acetate-tetrahydrofuran (3:1, v/v). The organic layer was washed with water and dried (MgSO4), after which the solvent was distilled off. The residue was subjected to silica gel column chromatography and eluted with chloroform-methanol (30:1, v/v) to yield 4,5-dihydro-8-methylthio-2-phenylthieno[3,4-e]benzimidazole-6-carboxamide (65 mg, 14%), which was then recrystallized from ethanol. Colorless prisms. Melting point 206-207° C.

1. extractionextracted with ethyl acetate-tetrahydrofuran (3:1, v/v)
2. washThe organic layer was washed with water
3. dry with materialdried (MgSO4)
4. distillationafter which the solvent was distilled off
5. washeluted with chloroform-methanol (30:1, v/v)