、
(1R,2S)-1-氨基-2-乙烯基环丙烷甲酸甲酯 在
N-甲基吗啉 、
Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
二氯甲烷 为溶剂,
以68%的产率得到methyl (1R,2S)-1-((5S,7a'S)-1-((S)-2-((S)-2-cyclohexyl-2-(pyrazine-2-carboxamido)acetamido)-3,3-dimethylbutanoyl)-2'-ethyl-1'-oxohexahydrospiro[pyrrolidine-3,3'-pyrrolo[1,2-c]imidazole]-5-carboxamido)-2-vinylcyclopropane-1-carboxylate