(2R,3S,4S,5R,6S)-4-((R)-1-(benzyloxy)-1-oxo-3-phenylpropan-2-yloxy)-5(benzyloxycarbonyloxy)-2-(benzyloxymethyl)-6-(ethylthio)tetrahydro-2H-pyran-3-yl 1-naphtoate 、
(2R,3R)-dimethyl-2-(3,4,5-triacetoxy-6-(acetoxymethyl)tetrahydro-2H-pyran-2-yloxy)-3-(3,4,5-tris(benzyloxy)-6-methyltetrahydro-2H-pyran-2-yloxy)succinate 在
溴 、
silver trifluoromethanesulfonate 作用下,
以
二氯甲烷 为溶剂,
反应 4.25h,
以58%的产率得到(2R,3R)-dimethyl 2-((2S,3R,4S,5S,6R)-5-(1-naphthoyloxy)-4-((R)-1-(benzyloxy)-1-oxo-3-phenylpropan-2-yloxy)-3-(benzyloxycarbonyloxy)-6-(benzyloxymethyl)tetrahydro-2Hpyran-2-yloxy)-3-((2S,3S,4R,5R,6S)-3,4,5-tris(benzyloxy)-6-methyltetrahydro-2H-pyran-2-yloxy)succinate