Boc-Asp-Phe-OEt 、 (4aR,6R,7R,8R,8aR)-7-azido-8-((tert-butyldimethylsilyl)oxy)-2,2-dimethylhexahydropyrano[3,2-d][1,3]dioxin-6-amine 在
N,N-二异丙基乙胺 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 16.17h,
以86%的产率得到ethyl N
4-((4aR,6R,7R,8R,8aR)-7-azido-8-((tert-butyldimethylsilyl)oxy)-2,2-dimethylhexahydropyrano[3,2-d][1,3]dioxin-6-yl)-N
2-(tert-butoxycarbonyl)-L-asparaginyl-L-phenylalaninate