benzyl 2-O-[(2,4,6-tri-O-benzoyl-α-D-mannopyranosyl)-(1->3)-(2,4,6-tri-O-benzoyl-α-D-mannopyranosyl)]-3,4,6-tri-O-benzyl-α-D-mannopyranoside 、 3-O-allyl-2,4,6-tri-O-benzoyl-α-D-mannopyranosyl trichloroacetimidate 在
三氟甲磺酸三甲基硅酯 、
三乙胺 作用下,
以
1,2-二氯乙烷 为溶剂,
反应 0.67h,
以94%的产率得到benzyl 2-O-[(3-O-allyl-2,4,6-tri-O-benzoyl-α-D-mannopyranosyl)-(1->3)-(2,4,6-tri-O-benzoyl-α-D-mannopyranosyl)-(1->3)-(2,4,6-tri-O-benzoyl-α-Dmannopyranosyl)]-3,4,6-tri-O-benzyl-α-D-mannopyranoside