(2S,3R)-(Z)-3-((R)-2-((R)-2-((R)-2-amino-3-methylbutanamido)propanamido)-3-(4-hydroxyphenyl)propanamido)-9-ethoxy-2-methyl-9-oxonon-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
N,N-二甲基甲酰胺 为溶剂,
反应 18.0h,
以6.1 mg的产率得到(Z)-ethyl 6-((2R,5R,8R,11R,12S)-8-(4-hydroxybenzyl)-2-isopropyl-5,12-dimethyl-3,6,9,13-tetraoxo-1,4,7,10-tetraazacyclotridecan-11-yl)hex-4-enoate