[4-[(4-nitrophenoxy)carbonyloxymethyl]phenyl] (2S)-5-(carbamoylamino)-2-(9H-fluoren-9-ylmethoxycarbonylamino)pentanoate 、
N-[(叔-丁氧基)羰基]-N,N'-二甲基乙二胺 以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 0.5h,
以65%的产率得到[4-[[methyl-[2-[methyl-[(2-methylpropan-2-yl)oxycarbonyl]amino]ethyl]carbamoyl]oxymethyl]phenyl] (2S)-5-(carbamoylamino)-2-(9H-fluoren-9-ylmethoxycarbonylamino)pentanoate