2,3,4-tri-O-benzoyl-α-L-rhamnopyranosyl-(1->4)-2,3-di-O-acetyl-6-O-benzoyl-β-D-glucopyranosyl-(1->6)-2,3,4-tri-O-acetyl-α-D-glucopyranosyl trichloroacetimidate 、
3-O-[2,3,4-tri-O-benzoyl-α-L-rhamnopyranosyl]oleanolic acid 28-O-trityl ester 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90%的产率得到3-O-[2,3,4-tri-O-benzoyl-α-L-rhamnopyranosyl]oleanolic acid 28-O-[2,3,4-tri-O-benzoyl-α-L-rhamnopyranosyl-(1->4)-2,3-di-O-acetyl-6-O-benzoyl-β-D-glucopyranosyl-(1->6)-2,3,4-tri-O-acetyl-β-D-glucopyranosyl] ester