反应详情

A solution of 290 mg (0.93 mmole) of (3R, 5S)-5-[(1S)-1-(t-butoxycarbonyl)amino-2-cyclohexylethyl]-3-methyldihydrofuran-2(3H)-one (prepared as described in Preparation 2) in 3 ml of methanol was mixed with 3 ml of isobutylamine, and the mixture was allowed to stand overnight at room temperature. At the end of this time, the reaction mixture was concentrated by distillation under reduced pressure, and the residue was triturated with hexane to afford 340 mg of the title compound as colorless crystals, melting at 125°-126° C.

1. concentrationAt the end of this time, the reaction mixture was concentrated by distillation under reduced pressure
2. customthe residue was triturated with hexane