[5-(1-cyclopropanesulfonylaminocarbonyl-2-vinyl-cyclopropylcarbamoyl)-pyrrolidin-3-yl]-carbamic acid 9H-fluoren-9-ylmethyl ester hydrochloride 、
N-甲氧羰基-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
乙腈 为溶剂,
以82%的产率得到methyl N-[(2S)-1-[(2S,4R)-2-[[1-(cyclopropylsulfonylcarbamoyl)-2-ethenylcyclopropyl]carbamoyl]-4-(9H-fluoren-9-ylmethoxycarbonylamino)pyrrolidin-1-yl]-3,3-dimethyl-1-oxobutan-2-yl]carbamate