O-(methyl 2-O-benzoyl-3,4-di-O-benzyl-L-idopyranosuronate) trichloroacetimidate 、 methyl (2R,3S,4S,5R,6R)-6-[(2R,3S,4R,5R,6R)-6-[(2R,3S,4S,5R,6R)-6-[(2R,3S,4R,5R,6S)-5-acetamido-2-(benzoyloxymethyl)-4-phenylmethoxy-6-propan-2-yloxyoxan-3-yl]oxy-5-(2,2-dimethylpropanoyloxy)-2-methoxycarbonyl-4-phenylmethoxyoxan-3-yl]oxy-5-azido-4-phenylmethoxy-2-(phenylmethoxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4R,5S,6R)-3-azido-6-(benzoyloxymethyl)-5-hydroxy-4-phenylmethoxyoxan-2-yl]oxy-4,5-bis(phenylmethoxy)oxane-2-carboxylate 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 3.0h,
以52%的产率得到methyl (2R,3S,4S,5R,6R)-6-[(2R,3S,4R,5R,6R)-6-[(2R,3S,4S,5R,6R)-6-[(2R,3S,4R,5R,6R)-6-[(2R,3S,4S,5R,6R)-6-[(2R,3S,4R,5R,6S)-5-acetamido-2-(benzoyloxymethyl)-4-phenylmethoxy-6-propan-2-yloxyoxan-3-yl]oxy-5-(2,2-dimethylpropanoyloxy)-2-methoxycarbonyl-4-phenylmethoxyoxan-3-yl]oxy-5-azido-4-phenylmethoxy-2-(phenylmethoxymethyl)oxan-3-yl]oxy-2-methoxycarbonyl-4,5-bis(phenylmethoxy)oxan-3-yl]oxy-5-azido-2-(benzoyloxymethyl)-4-phenylmethoxyoxan-3-yl]oxy-5-benzoyloxy-3,4-bis(phenylmethoxy)oxane-2-carboxylate