N-(benzyloxycarbonyl)-L-alanyl-L-threonyl-L-alanine benzyl ester 、
2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl-(1->3)-2,4,6-tri-O-benzyl-α,β-D-galactopyranosyl fluoride 在
4 A molecular sieve 、 zirconocene dichloride 、 silver perchlorate 作用下,
以
二氯甲烷 为溶剂,
反应 74.0h,
以58%的产率得到N-(benzyloxycarbonyl)-L-alanyl-O-[(2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl)-(1->3)-(2,4,6-tri-O-benzyl-α-D-galactopyranosyl)]-L-threonyl-L-alanine benzyl ester