4-(((S)-1-(((4S,7S)-4-(4-hydroxybenzyl)-15,15-dimethyl-3,6,13-trioxo-2,14-dioxa-5,12-diazahexadecan-7-yl)amino)-1-oxo-3-phenylpropan-2-yl)carbamoyl)pyridine 1-oxide 在
N,N-二异丙基乙胺 、 bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate 作用下,
以
四氢呋喃 为溶剂,
以52%的产率得到methyl (5S,8S,11S)-11-benzyl-8-(4-((tert-butoxycarbonyl)amino)butyl)-7,10,13-trioxo-2-oxa-6,9,12-triaza-1(2,4)-pyridina-3(1,4)-benzenacyclotridecaphane-5-carboxylate