反应详情

50.5 mg of sodium borohydride were added to a solution of 691 mg of 4-benzoyl-1-[(2'-t-butoxycarbonylbiphenyl-4-yl)methyl]-2-butyl-5-cyanoimidazole [prepared as described in step (a) above] in 10 ml of ethanol, and the resulting mixture was stirred at room temperature for 1 hour. The reaction mixture was then neutralized with aqueous hydrochloric acid, after which it was mixed with ethyl acetate and with a saturated aqueous solution of sodium chloride. The ethyl acetate layer was separated, dried over anhydrous magnesium sulfate and concentrated by evaporation under reduced pressure. The residue was purified by column chromatography through silica gel, using a 1:1 by volume mixture of hexane and ethyl acetate as the eluent, to give 589 mg of the title compound as a colorless amorphous solid.

1. customThe ethyl acetate layer was separated
2. dry with materialdried over anhydrous magnesium sulfate
3. concentrationconcentrated by evaporation under reduced pressure
4. customThe residue was purified by column chromatography through silica gel
5. additionby volume mixture of hexane and ethyl acetate as the eluent