methyl 2,4,6-tri-O-benzyl-β-D-galactopyranoside 、
2-methyl{3,6-di-O-acetyl-1,2-dideoxy-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-α-D-glucopyrano}[2,1-d]oxazoline 在
三氟甲磺酸三甲基硅酯 1,1,3,3-四甲基脲 作用下,
以
1,2-二氯乙烷 为溶剂,
以18%的产率得到methyl 3-O-<2-acetamido-3,6-di-O-acetyl-2-deoxy-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-β-D-glucopyranosyl>-2,4,6-tri-O-benzyl-β-D-galactopyranoside