(2R,3S,4S,5R)-4-methoxy-2-(methoxycarbonyl)-6-(2,2,2-trichloro-1-iminoethoxy)tetrahydro-2H-pyran-3,5-diyl diacetate 、
methyl [(2S,3R,4S,5S,6R)-5-hydroxy-2-methoxy-3-phenylmethoxy-6-(phenylmethoxymethyl)oxan-4-yl]methanesulfonate 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 0.5h,
以85%的产率得到methyl (2R,3S,4S,5R,6R)-3,5-diacetyloxy-4-methoxy-6-[(2R,3S,4S,5R,6S)-6-methoxy-4-(methoxysulfonylmethyl)-5-phenylmethoxy-2-(phenylmethoxymethyl)oxan-3-yl]oxyoxane-2-carboxylate