反应详情

N,N-Diisopropylethylamine (111 μL, 0.639 mmol) and subsequently bromoacetonitrile (203 μL, 2.90 mmol) were added to a solution of (S)-5-azido-2-((tert-butoxycarbonyl)amino)pentanoic acid (Compound tk69) (150 mg, 0.581 mmol) in acetonitrile (0.8 mL) at room temperature under a nitrogen atmosphere. The reaction mixture was stirred at the same temperature for 4 hours 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-azido-2-((tert-butoxycarbonyl)amino)pentanoate (Compound tk70) (185 mg, quant.).

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