allyl (4-O-benzyl-3-O-para-methoxybenzyl-α-L-rhamnopyranosyl)-(1→2)-(3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1→4)-(benzyl 2,3-di-O-benzyl-β-n-galactopyranosyluronate)-(1→3)-4,6-di-O-benzyl-2-deoxy-2-trichloroacetamido-β-n-galactopyranoside 、 (4-O-benzyl-3-O-para-methoxybenzyl-2-O-levulinoyl-α-L-rhamnopyranosyl)-(1→2)-(3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1→4)-(benzyl 2,3-di-O-benzyl-β-D-galactopyranosyluronate)-(1→3)-4,6-di-O-benzyl-2-deoxy-2-trichloroacetamido-α/-βD-galactopyranosyl N-phenyltrifluoroacetimidate 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81%的产率得到allyl (4-O-benzyl-3-O-para-methoxybenzyl-2-O-levulinoyl-α-L-rhamnopyranosyl)-(1→2)-(3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1→4)-(benzyl 2,3-di-O-benzyl-β-D-galactopyranosyluronate)-(1→3)-(4,6-di-O-benzyl-2-deoxy-2-trichloroacetamido-β-D-galactopyranosyl)-(1→2)-(4-O-benzyl-3-O-para-methoxybenzyl-α-L-rhamnopyranosyl)-(1→2)-(3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1→4)-(benzyl 2,3-di-O-benzyl-β-D-galactopyranosyluronate)-(1→3)-4,6-di-O-benzyl-2-deoxy-2-trichloroacetamido-β-D-galactopyranoside