O-(methyl 2-O-acetyl-4-O-(2-azido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-α-D-glucopyranosyl)-3-O-benzyl-α,β-L-idopyranosuronate) trichloroacetimidate 、
methyl [dimethylthexylsilyl 2-O-acetyl-4-O-(2-azido-6-O-benzoyl-3-O-benzyl-2-deoxy-α-D-glucopyranosyl)-3-O-benzyl-β-L-idopyranoside]uronate 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 1.5h,
以50%的产率得到methyl (2R,3S,4S,5R,6R)-3-[[(2R,4aR,6R,7R,8R,8aS)-7-azido-2-phenyl-8-phenylmethoxy-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-6-yl]oxy]-5-acetyloxy-6-[(2R,3S,4R,5R,6R)-6-[(2R,3S,4S,5R,6R)-5-acetyloxy-6-[2,3-dimethylbutan-2-yl(dimethyl)silyl]oxy-2-methoxycarbonyl-4-phenylmethoxyoxan-3-yl]oxy-5-azido-2-(benzoyloxymethyl)-4-phenylmethoxyoxan-3-yl]oxy-4-phenylmethoxyoxane-2-carboxylate