4-O-(3,4-isopropylidene-β-D-galactopyranosyl)-2,3:5,6-bis-O-isopropylidene-D-glucose dimethyl acetal 、
1-bromopentoxy-4-({2'-methoxy-4'-[(4''-nitrophenyl)azo]phenyl}azo)phenol 在
氢氧化钾 、
18-冠醚-6 作用下,
以
四氢呋喃 为溶剂,
以54%的产率得到(3aS,4R,6S,7R,7aR)-6-[(R)-[(4S,5R)-5-(dimethoxymethyl)-2,2-dimethyl-1,3-dioxolan-4-yl]-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]methoxy]-4-[5-[4-[[2-methoxy-4-[(4-nitrophenyl)diazenyl]phenyl]diazenyl]phenoxy]pentoxymethyl]-2,2-dimethyl-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-7-ol