(6-O-levulinoyl-2,3,4-tri-O-p-toluoyl-α-D-glucopyranosyl)-(1->3)-4,6-di-O-acetyl-2-deoxy-2-phthalimido-β-D-galactopyranosyl trichloroacetimidate 、
5-azidopentyl (6-O-levulinoyl-2,3,4-tri-O-p-toluoyl-α-D-glucopyranosyl)-(1->3)-4-O-acetyl-2-deoxy-2-phthalimido-β-D-galactopyranoside 在
4 A molecular sieve 、
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 1.0h,
以70%的产率得到[(2R,3R,4S,5R,6R)-6-[(2R,3R,4R,5R,6R)-3-acetyloxy-2-[[(2R,3R,4R,5R,6R)-5-acetyloxy-6-(acetyloxymethyl)-3-(1,3-dioxoisoindol-2-yl)-4-[(2R,3R,4S,5R,6R)-3,4,5-tris[(4-methylbenzoyl)oxy]-6-(4-oxopentanoyloxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-6-(5-azidopentoxy)-5-(1,3-dioxoisoindol-2-yl)oxan-4-yl]oxy-4,5-bis[(4-methylbenzoyl)oxy]-2-(4-oxopentanoyloxymethyl)oxan-3-yl] 4-methylbenzoate