(2S,4S)-4-(5-tert-Butoxycarbonylamino-pentanoyloxy)-pyrrolidine-1,2-dicarboxylic acid 1-(9H-fluoren-9-ylmethyl) ester 在
1-羟基苯并三唑 、 O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 、
N,N-二异丙基乙胺 作用下,
生成 (1S,4S,10R,19S)-21-[Z(O-benzyl)L-Tyr]-4-benzyl-2,5,11,17-tetraoxo-18-oxa-3,6,12,21-tetraaza-tricyclo[17,2,1,0
6,10]-docosane