tert-butyl (3S)-3-[[(3S)-3-[[(3S)-3-(9H-fluoren-9-ylmethoxycarbonylamino)-4-oxo-4-(prop-2-ynylamino)butanoyl]amino]-4-oxo-4-(prop-2-ynylamino)butanoyl]amino]-4-oxo-4-(prop-2-ynylamino)butanoate 、
2-azidoethyl 2,3,4,6-tetra-O-acetyl-α-D-mannopyranoside 在
copper(ll) sulfate pentahydrate 、
维生素 C 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以70%的产率得到tert-butyl (3S)-3-[[(3S)-3-[[(3S)-3-(9H-fluoren-9-ylmethoxycarbonylamino)-4-oxo-4-[[1-[2-[(2S,3S,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyethyl]triazol-4-yl]methylamino]butanoyl]amino]-4-oxo-4-[[1-[2-[(2S,3S,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyethyl]triazol-4-yl]methylamino]butanoyl]amino]-4-oxo-4-[[1-[2-[(2S,3S,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyethyl]triazol-4-yl]methylamino]butanoate