allyl 2,3,6-tri-O-benzyl-4-O-(2,3,6-tri-O-benzyl-β-D-glucopyranosyl)-β-D-glucopyranoside 、 4-O-(2',3',4',6'-tetra-O-acetyl-β-D-glucopyranosyl)-2,3,6-tri-O-acetyl-α-D-glucopyranosyl trichloracetimidate 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 2.0h,
以87%的产率得到allyl 2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl-(1->4)-2,3,6-tri-O-acetyl-β-D-glucopyranosyl-(1->4)-2,3,6-tri-O-benzyl-β-D-glucopyranosyl-(1->4)-2,3,6-tri-O-benzyl-β-D-glucopyranoside