(2R,3S,4S,5R,6R)-3,4,5-Tris-benzyloxy-2-benzyloxymethyl-6-chloro-tetrahydro-pyran 、
benzyl 2-[(2R,3R,4S,5S,6R)-6-(azidomethyl)-5-hydroxy-2-methoxy-4-phenylmethoxyoxan-3-yl]oxyacetate 在
2,3,5-三甲基吡啶 、
silver trifluoromethanesulfonate 作用下,
以
乙醚 、
甲苯 为溶剂,
以70%的产率得到methyl 2,3,4,6-tetra-O-benzyl-α-D-galactopyranosyl-(1->4)-3-O-benzyl-6-azido-2-benzyl-acetate-6-deoxy-β-D-galactopyranosyide