(2R,5R,8R,11S,12S)-(Z)-12-amino-2-benzyl-8-isopropyl-5,11-dimethyl-4,7,10,18-tetraoxo-19-oxa-3,6,9-triazahenicos-14-en-1-oic 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
N,N-二甲基甲酰胺 为溶剂,
反应 16.0h,
以66 mg的产率得到(Z)-ethyl 6-((2R,5R,8R,11S,12S)-8-benzyl-2-isopropyl-5,12-dimethyl-3,6,9,13-tetraoxo-1,4,7,10-tetraazacyclotridecan-11-yl)hex-4-enoate