(3R,4R,5R)-5-hydroxy-3,4,6-tribenzyloxy-1-hexene 、
3-[(2R,3S,4S,5R,6S)-4-(carboxymethyl)-6-methoxy-3,5-bis(phenylmethoxy)oxan-2-yl]propanoic acid 在
4-二甲氨基吡啶 、
N,N'-二环己基碳二亚胺 作用下,
以
二氯甲烷 为溶剂,
以45%的产率得到3-[(2R,3S,4S,5R,6S)-3,5-Bis-benzyloxy-4-((1R,2S,3R)-2,3-bis-benzyloxy-1-benzyloxymethyl-pent-4-enyloxycarbonylmethyl)-6-methoxy-tetrahydro-pyran-2-yl]-propionic acid (1R,2S,3R)-2,3-bis-benzyloxy-1-benzyloxymethyl-pent-4-enyl ester