(S)-4-((((R)-2'-(aminomethyl)-4-methyl-4,5-dihydro-[2,4'-bithiazole]-4-carbonyl)-L-valyl)oxy)hex-5-enoic acid 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
四氢呋喃 为溶剂,
以438 mg的产率得到(5R,8S,11S)-11-ethenyl-5-methyl-8-propan-2-yl-10-oxa-3,18-dithia-7,15,20,21-tetrazatricyclo[15.2.1.12,5]henicosa-1(19),2(21),17(20)-triene-6,9,14-trione