3,6,9,12-tetrakis(3-(tert-butoxy)-3-oxopropyl)-15-((3-(tert-butoxy)-3-oxopropyl)glycyl)-20,20-dimethyl-4,7,10,13,18-pentaoxo-19-oxa-3,6,9,12,15-pentaazahenicosanoic 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 22.0h,
以63%的产率得到hexa-tert-butyl 3,3',3'',3''',3'''',3'''''-(2,5,8,11,14,17-hexaoxo-1,4,7,10,13,16-hexaazacyclooctadecane-1,4,7,10,13,16-hexayl)hexapropionate