2,3:5,6-bis-O-(1-methylethylidene)-4-O-[6-O-(2-methoxy-2-methylethyl)-2-O-(4-bromobutyl)-3,4-O-(1-methylethylidene)-β-D-galactopyranosyl]-aldehydo-D-glucose dimethyl acetal 、
2,3:5,6-di-O-isopropylidene-4-O-[3,4-O-isopropylidene-2-O-methyl-β-D-galactopyranosyl]-aldehydo-D-glucose dimethyl acetal 在
sodium hydride 、
吡啶 、
乙酸酐 作用下,
以
四氢呋喃 为溶剂,
反应 24.5h,
以57%的产率得到2,3:5,6-bis-O-(1-methylethylidene)-4-O-{2-O-[2-O-methyl-1-O-(2,3:5,6:di-O-(1-methylethylidene)-aldehydo-D-glucose-1-(dimethoxymethyl)-4-yloxy)-butyl]-3,4-O-(1-methylethylidene)-β-D-galactopyranos-6-yloxy}-aldehydo-D-glucose dimethyl acetal