2,3,4,6,7-penta-O-acetyl-L-glycero-α-D-manno-heptopyranosyl trichloroacetimidate 、
allyl O-(2,3,4-tri-O-benzoyl-α-D-glucopyranosyl)-(1<*>2)-O-(3,4,6-tri-O-acetyl-α-D-glucopyranosyl)-(1<*>3)-2-O-benzoyl-4,6-benzylidene-α-D-glucopyranoside 在
三氟甲磺酸三甲基硅酯 、 3 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
以52%的产率得到allyl O-(2,3,4,6,7-penta-O-acetyl-L-glycero-α-D-manno-heptopyranosyl)-(1<*>6)-(2,3,4-tri-O-benzoyl-α-D-glucopyranosyl)-(1<*>2)-O-(3,4,6-tri-O-acetyl-α-D-glucopyranosyl)-(1<*>3)-2-O-benzoyl-4,6-benzylidene-α-D-glucopyranoside