O-[methyl 4-O-(2-azido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-α-D-glucopyranosyl)-3-O-benzyl-2-O-levulinoyl-L-idopyranosyluronate] trichloroacetamidate 、
isopropyl O-(2-azido-3,6-di-O-benzyl-2-deoxy-α-D-glucopyranosyl)-(1->4)-O-(methyl 3-O-benzyl-2-O-pivaloyl-α-L-idopyranosyluronate)-(1->4)-2-acetamido-6-O-benzoyl-3-O-benzyl-2-deoxy-α-D-glucopyranoside 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 3.0h,
以59%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)-6-[(2R,3S,4S,5R,6R)-6-[(2R,3S,4R,5R,6S)-5-acetamido-2-(benzoyloxymethyl)-4-phenylmethoxy-6-propan-2-yloxyoxan-3-yl]oxy-5-(2,2-dimethylpropanoyloxy)-2-methoxycarbonyl-4-phenylmethoxyoxan-3-yl]oxy-5-azido-4-phenylmethoxy-2-(phenylmethoxymethyl)oxan-3-yl]oxy-5-(4-oxopentanoyloxy)-4-phenylmethoxyoxane-2-carboxylate