2-(trimethylsilyl)ethyl (S)-3-((((R)-2'-(((tert-butoxycarbonyl)amino)methyl)-4-methyl-4,5-dihydro-[2,4'-bithiazole]-4-carbonyl)-L-valyl)oxy)pent-4-enoate 在
三氟乙酸 、
1-羟基苯并三唑 、
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
二氯甲烷 、
乙腈 为溶剂,
以64%的产率得到(5R,8S,11S)-11-ethenyl-5-methyl-8-propan-2-yl-10-oxa-3,17-dithia-7,14,19,20-tetrazatricyclo[14.2.1.12,5]icosa-1(18),2(20),16(19)-triene-6,9,13-trione