(2S,3S,4S,5R,6R)-4-(benzyloxy)-5-(((2R,4aR,6S,7S,8S,8aS)-7-(benzyloxy)-8-hydroxy-2-phenylhexahydropyrano[3,2-d][1,3]dioxin-6-yl)oxy)-6-((benzyloxy)methyl)-2-(pent-4-en-1-yloxy)tetrahydro-2H-pyran-3-yl pivalate 、
2'-carboxybenzyl 2,3-di-O-benzyl-4,6-O-benzylidene-α-D-mannopyranoside 在
2,6-二叔丁基-4-甲基吡啶 、
三氟甲磺酸酐 作用下,
以
二氯甲烷 为溶剂,
以74%的产率得到[(2S,3S,4S,5R,6R)-5-[[(2R,4aR,6S,7S,8S,8aR)-8-[[(2R,4aR,6S,7S,8S,8aR)-2-phenyl-7,8-bis(phenylmethoxy)-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-6-yl]oxy]-2-phenyl-7-phenylmethoxy-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-6-yl]oxy]-2-pent-4-enoxy-4-phenylmethoxy-6-(phenylmethoxymethyl)oxan-3-yl] 2,2-dimethylpropanoate