(2R,3S,4R,5R,6S)-5-Azido-4-benzyloxy-2-benzyloxymethyl-6-((2S,3S,4S,5R,6R)-2,4,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-3-yloxy)-tetrahydro-pyran-3-ol 、 methyl (2S,4S,5R,6R)-5-acetamido-4-acetyloxy-2-[(2R,3S,4S,5R,6S)-3,5-diacetyloxy-2-(phenylmethoxymethyl)-6-(2,2,2-trichloroethanimidoyl)oxyoxan-4-yl]oxy-6-[(1S,2R)-1,2,3-triacetyloxypropyl]oxane-2-carboxylate 在
三氟甲磺酸三甲基硅酯 、 MS 4 Angstroem 作用下,
以
二氯甲烷 为溶剂,
以83%的产率得到methyl (2S,4S,5R,6R)-5-acetamido-4-acetyloxy-2-[(2S,3R,4S,5S,6R)-3,5-diacetyloxy-2-[(2R,3S,4R,5R,6S)-5-azido-4-phenylmethoxy-2-(phenylmethoxymethyl)-6-[(2S,3S,4S,5R,6R)-2,4,5-tris(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-6-(phenylmethoxymethyl)oxan-4-yl]oxy-6-[(1S,2R)-1,2,3-triacetyloxypropyl]oxane-2-carboxylate