反应详情

A solution of methyl (E)-3-(2-aminophenyl)propenoate (531.6 mg) and 4-formylimidazole (317.1 mg) in methanol (7.0 ml) was stirred at ambient temperature for 18 hours. To the reaction mixture was added sodium borohydride (56.5 mg) under stirring and cooling in an ice-bath. After the mixture was stirred for 2 hours at ambient temperature, sodium borohydride (56.5 mg) was added thereto. The mixture was stirred for 2 hours at ambient temperature. To the reaction mixture was added acetic acid in order to decompose the excess sodium borohydride and the methanol was removed under reduced pressure. To the residue were added diluted hydrochloric acid and ethyl acetate under stirring. The separated aqueous layer was basified with aqueous sodium bicarbonate and extracted twice with ethyl acetate. The extract was washed with water, dried over magnesium sulfate and evaporated to give a residue, which was subjected to column chromatography on silica gel with an eluent of a mixture of chloroform and methanol (20:1) to afford pure methyl (E)-3-[2-(4-imidazolylmethylamino)phenyl]-propenoate (0.7 g) as an oil.

1. temperaturecooling in an ice-bath
2. stirringAfter the mixture was stirred for 2 hours at ambient temperature
3. stirringThe mixture was stirred for 2 hours at ambient temperature
4. customthe methanol was removed under reduced pressure
5. additionTo the residue were added diluted hydrochloric acid and ethyl acetate
6. stirringunder stirring
7. extractionextracted twice with ethyl acetate
8. washThe extract was washed with water
9. dry with materialdried over magnesium sulfate
10. customevaporated
11. customto give a residue, which