反应详情

A mixture of ethyl 1-[(2′-cyanobiphenyl-4-yl)methyl]-2-propoxybenzimidazole-7-carboxylate (0.69 g) and trimethyltin azide (0.7 g) in toluene (15 ml) was heated for 4 days under reflux. The reaction mixture was concentrated to dryness and to the mixture was added methanol (20 ml) and 1N—HCl (10 ml). After stirring at room temperature for 30 minutes, the mixture was adjusted to pH 3-4 with 1N NaOH. After removal of the solvent, the residue was extracted with chloroform-water. The organic layer was washed with water and dried, and the solvent was evaporated to dryness to give a syrup. The syrup was purified by column chromatography on silica gel to give crystals. Recrystallization from ethyl acetate-benzene afforded colorless crystals (0.31 g, 43%), m.p. 157-159° C.

1. temperaturewas heated for 4 days
2. temperatureunder reflux
3. concentrationThe reaction mixture was concentrated to dryness and to the mixture
4. additionwas added methanol (20 ml) and 1N—HCl (10 ml)
5. customAfter removal of the solvent
6. extractionthe residue was extracted with chloroform-water
7. washThe organic layer was washed with water
8. customdried
9. customthe solvent was evaporated to dryness
10. customto give a syrup
11. customThe syrup was purified by column chromatography on silica gel
12. customto give crystals
13. customRecrystallization from ethyl acetate-benzene afforded colorless crystals (0.31 g, 43%), m.p. 157-159° C.