Electrochemical reduction of halogenosugars on silver: a new approach to C-disaccharide-like mimics
作者:Marco Guerrini、Giangiacomo Torri、Marco Guerrini、Patrizia Mussini、Sandra Rondinini、Elena Vismara
DOI:10.1039/a802392a
日期:——
Electrochemical reduction on silver of tri-O-acetyl-α-D-fucopyranosyl bromide 3 affords (1 → 1′)-linked C-disaccharide-like mimics 6–8; reduction of 1,2:3,4-di-O-isopropylidene-6-deoxy-6-iodo-α-D-galactopyranose 5 provides 1,2:3,4-di-O-isopropylidene-6-deoxy-6-(1′,2′ : 3′,4′-di-O-isopropylidene-6′-deoxy-α-D-galactopyranos-6′-yl)-α-D-galactopyranose 9; simultaneous reduction of 5 and tetra-O-acetyl-α-D-glucopyranosyl bromide 1 or tri-O-acetyl-α-L-fucopyranosyl bromide 4 gives 9 and methylene-bridged C-disaccharide-like mimics 11, 12 or 13, 14, respectively.
在银上电化学还原三-O-乙酰基-α-D-吡喃核糖溴化物 3,可得到 (1 → 1′)-linked C-disaccharide-like mimics 6-8;还原 1,2:3,4-二-O-异亚丙基-6-脱氧-6-碘-α-D-吡喃半乳糖 5 的还原,得到 1,2:3,4-二-O-异亚丙基-6-脱氧-6-(1′,2′ :3′,4′-二-O-异亚丙基-6′-脱氧-α-D-吡喃半乳糖-6′-基)-α-D-吡喃半乳糖 9;同时还原 5 和四-O-乙酰基-α-D-吡喃葡萄糖溴化物 1 或三-O-乙酰基-α-L-吡喃葡萄糖溴化物 4,可分别得到 9 和亚甲基桥式 C-二糖模拟物 11、12 或 13、14。