反应详情

N,N-Diisopropylethylamine (173 μL, 0.991 mmol) and subsequently bromoacetonitrile (314 μL, 4.50 mmol) were added to a solution of (S)-5-((((4-azidobenzyl)oxy)carbonyl)amino)-2-((tert-butoxycarbonyl)amino)pentanoic acid (Compound tk57) (367 mg, 0.901 mmol) in acetonitrile (1 mL) at room temperature under a nitrogen atmosphere. The reaction mixture was stirred at the same temperature for 1 hour and then concentrated under reduced pressure, and the resulting crude product was purified by normal-phase silica gel column chromatography (hexane/ethyl acetate) to afford (S)-cyanomethyl 5-((((4-azidobenzyl)oxy)carbonyl)amino)-2-((tert-butoxycarbonyl)amino)pentanoate (Compound tk58) (417.2 mg, quant.).

1. concentrationconcentrated under reduced pressure
2. customthe resulting crude product was purified by normal-phase silica gel column chromatography (hexane/ethyl acetate)