benzyl (2S,3S,4S,5R,6R)-6-[(2R,3R,4S,5R)-4-acetyloxy-2-(acetyloxymethyl)-5-phenylmethoxy-6-(2,2,2-trichloroethanimidoyl)oxyoxan-3-yl]oxy-3-[(2R,3R,4S,5R,6R)-6-(acetyloxymethyl)-3,4,5-trimethoxyoxan-2-yl]oxy-4,5-dimethoxyoxane-2-carboxylate 、
(2R,3S,4S,5R,6R)-6-[(2R,3R,4R,5S,6S)-6-(2-Azido-ethyl)-4-benzyloxy-5-methoxy-2-methoxymethyl-tetrahydro-pyran-3-yloxy]-3-hydroxy-4,5-dimethoxy-tetrahydro-pyran-2-carboxylic acid benzyl ester 在
三氟甲磺酸三甲基硅酯 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
反应 0.5h,
以75%的产率得到benzyl (2S,3S,4S,5R,6R)-6-[(2R,3R,4S,5R,6R)-4-acetyloxy-2-(acetyloxymethyl)-6-[(2R,3S,4S,5R,6R)-6-[(2R,3R,4R,5S,6S)-6-(2-azidoethyl)-5-methoxy-2-(methoxymethyl)-4-phenylmethoxyoxan-3-yl]oxy-4,5-dimethoxy-2-phenylmethoxycarbonyloxan-3-yl]oxy-5-phenylmethoxyoxan-3-yl]oxy-3-[(2R,3R,4S,5R,6R)-6-(acetyloxymethyl)-3,4,5-trimethoxyoxan-2-yl]oxy-4,5-dimethoxyoxane-2-carboxylate