[5-(1-cyclopropanesulfonylaminocarbonyl-2-vinyl-cyclopropylcarbamoyl)-pyrrolidin-3-yl]-carbamic acid 9H-fluoren-9-ylmethyl ester hydrochloride 、
N-Boc-L-叔亮氨酸 在
N,N-二异丙基乙胺 、 ((3H-[1,2,3]triazolo[4,5-b]pyridin-3-yl)oxy)tri(pyrrolidin-1-yl)phosphonium hexafluorophosphate(V) 作用下,
以
二氯甲烷 为溶剂,
以63%的产率得到[1-(2-tert-butoxycarbonylamino-3,3-dimethyl-butyryl)-5-(1-cyclopropanesulfonylaminocarbonyl-2-vinyl-cyclopropylcarbamoyl)-pyrrolidin-3-yl]-carbamic acid 9H-fluoren-9-ylmethyl ester