L-苯丙氨酸甲酯 、 11-(N-Cbz-L-alanyl)amino-23-O-benzotriazolyloxycarbonyl-25,27-dihydroxy-26,28-dipropoxypentacyclo[19.3.1.13,7.19,13.115,19]octacosa-1(25),3,5,7(28),9,11,13(27),15,17,19(26),21,23-dodecene 在
O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
以76%的产率得到methyl (2S)-2-[[26,28-dihydroxy-17-[[(2S)-2-(phenylmethoxycarbonylamino)propanoyl]amino]-25,27-dipropoxypentacyclo[19.3.1.13,7.19,13.115,19]octacosa-1(25),3,5,7(28),9(27),10,12,15(26),16,18,21,23-dodecaene-5-carbonyl]amino]-3-phenylpropanoate