allyl 4,6-di-O-acetyl-2-O-benzoyl-β-D-glucopyranosyl-(1->3)-[2,3,4,6-tetra-O-benzoyl-β-D-glucopyranosyl-(1->6)]-4-O-acetyl-2-O-benzoyl-α-D-glucopyranoside 、
2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-α-D-glucopyranosyl trichloroacetimidate 在
三氟甲磺酸三甲基硅酯 、 4 A molecular sieve 作用下,
以
二氯甲烷 为溶剂,
反应 4.0h,
以79%的产率得到allyl 2-O-benzoyl-4,6-O-benzylidene-3-O-chloroacetyl-β-D-glucopyranosyl-(1->3)-4,6-di-O-acetyl-2-O-benzoyl-β-D-glucopyranosyl-(1->3)-[2,3,4,6-tetra-O-benzoyl-β-D-glucopyranosyl-(1->6)]-4-O-acetyl-2-O-benzoyl-α-D-glucopyranoside