4-Vinyl-1,3-dihydro-isoindole-2-carboxylic acid 5-methoxycarbonyl-pyrrolidin-3-yl ester 、
2,2,12,12-tetramethyl-4,9-dioxo-3,10-dioxa-5,8-diazahexadec-15-ene-7-carboxylic acid 在
N,N-二异丙基乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
四氢呋喃 为溶剂,
以90%的产率得到(2S,4R)-methyl 1-((S)-3-(tert-butoxycarbonylamino)-2-((2,2-dimethylhex-5-enyloxy)carbonylamino)propanoyl)-4-(4-vinyl-2,3-dihydro-1H-isoindoline-2-carbonyloxy)pyrrolidine-2-carboxylate