乙酸酐 、
methyl 3-O-<2-acetamido-2-deoxy-3-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-β-D-glucopyranosyl>-β-D-galactopyranoside 在
吡啶 作用下,
以94.9%的产率得到methyl 3-O-<2-acetamido-4,6-di-O-acetyl-2-deoxy-3-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-β-D-glucopyranosyl>-2,4,6-tri-O-acetyl-β-D-galactopyranoside