4-methoxyphenyl 2-O-acetyl-4-O-benzyl-α-L-rhamnopyranoside 、
(3R,4S,5R,6R)-2-(2,2,2-trichloroacetimidoyloxy)-5-azido-4-benzyloxytetrahydro-6-methyl-2H-pyran-3-yl 4-oxopentanoate 在
三氟甲磺酸三甲基硅酯 、
吡啶 作用下,
以
二氯甲烷 、
甲苯 为溶剂,
反应 1.5h,
以90%的产率得到4-Oxo-pentanoic acid (2S,3R,4S,5R,6R)-2-[(2S,3R,4R,5S,6S)-3-acetoxy-5-benzyloxy-2-(4-methoxy-phenoxy)-6-methyl-tetrahydro-pyran-4-yloxy]-5-azido-4-benzyloxy-6-methyl-tetrahydro-pyran-3-yl ester