乙酸酐 、
(2R,3S,4aS,6R,7R,8S,8aS)-2-Allyl-7,8-bis-benzyloxy-6-benzyloxymethyl-2-methyl-octahydro-pyrano[3,2-b]pyran-3-ol 生成 [(2R,3R,4S,4aS,6R,7S,8aS)-6-methyl-3,4-bis(phenylmethoxy)-2-(phenylmethoxymethyl)-6-prop-2-enyl-3,4,4a,7,8,8a-hexahydro-2H-pyrano[3,2-b]pyran-7-yl] acetate