methyl (isopropyl 4-O-(2-azido-3-O-benzyl-6-O-(4-methoxybenzyl)-2-deoxy-α-D-glucopyranosyl)-3-O-benzyl-2-O-benzoyl-α-L-idopyranosyl)uronate 、 O-(methyl 4-O-(2-azido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-α-D-glucopyranosyl)-3-O-benzyl-2-O-benzoyl-α,β-L-idopyranosyluronate) trichloroacetimidate 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 0.25h,
以85%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]-6-[(2R,3S,4R,5R,6R)-5-azido-6-[(2R,3S,4S,5R,6R)-5-benzoyloxy-2-methoxycarbonyl-4-phenylmethoxy-6-propan-2-yloxyoxan-3-yl]oxy-2-[(4-methoxyphenyl)methoxymethyl]-4-phenylmethoxyoxan-3-yl]oxy-5-benzoyloxy-4-phenylmethoxyoxane-2-carboxylate