(3aR,4R,6S,7aS)-methyl 6-((2S,3R,4S,5S,6R)-3-(benzoyloxy)-6-(benzyloxymethyl)-5-hydroxy-2-(p-tolylthio)tetrahydro-2H-pyran-4-yloxy)-4-((4S,5R)-5-(benzyloxymethyl)-2,2-dimethyl-1,3-dioxolan-4-yl)-2-oxohexahydro-2H-pyrano[3,4-d]oxazole-6-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 4.0h,
以73%的产率得到methyl (3aR,4R,6S,7aS)-6-((2R,3S,4S,5R,6S)-3-((2S,3R,4R,5S,6R)-6-(acetoxymethyl)-5-(benzyloxy)-4-(tert-butyldimethylsilyloxy)-3-((2,2,2-trichloroethoxy)carbonylamino)tetrahydro-2H-pyran-2-yloxy)-5-(benzoyloxy)-2-(benzyloxymethyl)-6-(p-tolylthio)tetrahydro-2H-pyran-4-yloxy)-4-((4S,5R)-5-(benzyloxymethyl)-2,2-dimethyl-1,3-dioxolan-4-yl)-2-oxohexahydro-2H-pyrano[3,4-d]oxazole-6-carboxylate