4-O-benzyl-2-O-levulinoyl-3-O-p-methoxybenzyl-α-L-rhamnopyranosyl trichloroacetimidate 、
allyl (3,4-di-O-benzyl-α-L,-rhamnopyranosyl)-(1->3)-[2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl-(1->4)]-2-O-acetyl-α-L-rhamnopyranoside 在
三氟甲磺酸三甲基硅酯 作用下,
以
1,2-二氯乙烷 为溶剂,
反应 2.5h,
以76%的产率得到allyl (4-O-benzyl-2-O-levulinoyl-3-O-para-methoxybenzyl-α-L-rhamnopyranosyl)-(1->2)-(3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1->3)-[2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl-(1->4)]-2-O-acetyl-α-L-rhamnopyranoside