Methyl 1-[(2'-t-butoxycarbonylbiphenyl-4-yl)methyl]-2-butyl-4-formylimidazole-5-carboxylate → Methyl 1-[(2'-t-butoxycarbonylbiphenyl-4-yl)methyl]-2-butyl-4-(1-hydroxy-2,2-dimethylpropyl)imidazole-5-carboxylate

Participants

Reaction Steps

2.77 ml of a 2M solution of t-butylmagnesium bromide in tetrabydrofuran were added at -55° C. and under an atmosphere of nitrogen to a solution of 1.32 g of methyl 1-[(2'-t-butoxycarbonylbiphenyl-4-yl)methyl]-2-butyl-4-formylimidazole-5-carboxylate [prepared as described in step (a))above] in 26 ml of tetrahydrofuran, and the resulting mixture was stirred at a temperature of -55° C. to -50° C. for 30 minutes. At the end of this time, the reaction mixture was diluted with 50 ml of ethyl acetate and with a saturated aqueous solution of ammonium chloride. The organic layer was separated and dried over anhydrous magnesium sulfate and the solvent was removed by distillation under reduced pressure. The residue was purified by column chromatography through silica gel, using a 2:1 by volume mixture of hexane and ethyl acetate as the eluent, to afford 0.87 g of the title compound as an amorphous solid.

Provenance & Evidence