Phthalic acid mono-((4aR,6S,7R,8S,8aR)-8-acetoxy-2,2-dimethyl-6-phenylsulfanyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-yl) ester 、 Acetic acid (2R,3R,4S,5R,6R)-4,5-diacetoxy-6-hydroxymethyl-2-[(2R,3R,4S,5R,6S)-6-methoxy-3,4,5-tris-(4-methyl-benzyloxy)-tetrahydro-pyran-2-ylmethoxy]-tetrahydro-pyran-3-yl ester 在
4-二甲氨基吡啶 、
N,N'-二环己基碳二亚胺 作用下,
以
甲苯 为溶剂,
以97%的产率得到