在
N-甲基吗啉 、 (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate 、
三氟乙酸 作用下,
生成 (E)-(3S,6S,11S,14S,17S,21S)-6-Benzyloxycarbonylamino-11-isobutyl-14-isopropyl-17-((R)-1-methoxycarbonyl-ethylcarbamoyl)-3-methyl-2,5,9,12,15-pentaoxo-1-oxa-4,10,13,16-tetraaza-cyclohenicos-18-ene-21-carboxylic acid butyl ester