乙酸酐 、
phenyl 1-deoxy-1-thio-4-O-(3',6'-di-O-p-toluenesulfonyl-β-D-galactopyranosyl)-β-D-glucopyranoside 在
吡啶 作用下,
反应 20.0h,
以97%的产率得到phenyl 2,3,6-tri-o-acetyl-4-O-(2',4'di-O-acetyl-3',6'-di-O-p-toluenesulfonyl-β-D-galactopyranosyl)-1-deoxy-1-thio-β-D-glucopyranoside