N-[({5-[2-({[(3R,5S)-5-(methoxycarbonyl)pyrrolidinium-3-yl]oxy}carbonyl)-2,3-dihydro-1H-isoindol-4-yl]pent-4-yn-1-yl}oxy)carbonyl]-3-methyl-L-valine 在
4-二甲氨基吡啶 、
三乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
二氯甲烷 为溶剂,
反应 2.0h,
以43%的产率得到methyl-(5R,7S,10S)-10-tert-butyl-3,9,12-trioxo-17,18-didehydro-1,6,7,9,10,11,12,14,15,16-decahydro-5H-2,22:5,8-dimethano-4,13,2,8,11-benzodioxatriazacycloicosine-7-carboxylate