(S)-(4S,5S,7R)-8-carboxy-5,7-dimethyl-6-hydroxy-8-oxo-octan-4-yl 2-((S)-2-amino-N-methyl-3-phenylpropanamido)-3-phenylpropanoate 在
4-二甲氨基吡啶 、 O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
反应 5.0h,
以40%的产率得到(3S,6S,9R,11R,12S)-3,6-dibenzyl-10-hydroxy-4,9,11-trimethyl-12-propyl-1-oxa-4,7-diazacyclododecane-2,5,8-trione