2-[(1S)-1-[[2-[(1S)-1-[[2-[(1S)-1-amino-3-methylbutyl]-1,3-oxazole-4-carbonyl]amino]-4-(phenylmethoxycarbonylamino)butyl]-1,3-oxazole-4-carbonyl]amino]-4-(phenylmethoxycarbonylamino)butyl]-1,3-oxazole-4-carboxylic acid 在
4‐(4,6dimethoxy‐1,3,5‐triazin‐2‐yl)‐4‐methylmorpholinium tetrafluoroborate 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 72.0h,
以32%的产率得到benzyl N-[3-[(4S,11S,18S)-11-(2-methylpropyl)-2,9,16-trioxo-18-[3-(phenylmethoxycarbonylamino)propyl]-6,13,20-trioxa-3,10,17,22,23,24-hexazatetracyclo[17.2.1.15,8.112,15]tetracosa-1(21),5(24),7,12(23),14,19(22)-hexaen-4-yl]propyl]carbamate