2-O-trans-cinnamoyl-3-O-p-methoxybenzyl-4-O-n-dodecanoyl-α-L-rhamnopyranosyl-(1->4)-2-O-2(S)-methylbutyryl-3-O-p-methoxybenzyl-α-L-rhamnopyranosyl trichloroacetimidate 、
allyl 2-O-levulinoyl-3-O-p-methoxybenzyl-α-L-rhamnopyranoside 在
三氟甲磺酸三甲基硅酯 作用下,
以
二氯甲烷 为溶剂,
反应 1.67h,
以94%的产率得到allyl 2-O-trans-cinnamoyl-3-O-p-methoxybenzyl-4-O-n-dodecanoyl-α-L-rhamnopyranosyl-(1→4)-2-O-2(S)-methylbutyryl-3-O-p-methoxybenzyl-α-L-rhamnopyranosyl-(1→4)-2-O-levulinoyl-3-O-pmethoxybenzyl-α-L-rhamnopyranoside