Conformational Effects on Glycoside Reactivity: Study of the High Reactive Conformer of Glucose
作者:Ciaran McDonnell、Oscar López、Paul Murphy、José G. Fernández Bolaños、Rita Hazell、Mikael Bols
DOI:10.1021/ja047476t
日期:2004.10.1
The effect of conformation on glycoside reactivity was investigated by studying the hydrolysis of a selection of 3,6-anhydroglucosides as models for glucose in the highly reactive (1)C(4) conformation. Methyl 3,6-anhydro-beta-D-glucopyranoside was found to hydrolyze 200-400 times faster than methyl glucosides in the (4)C(1) conformation, while methyl 3,6-anhydro-beta-D-galactopyranoside, which is in
构象对糖苷反应性的影响通过研究作为高反应性 (1)C(4) 构象中葡萄糖模型的 3,6-脱水糖苷的选择的水解来研究。发现甲基 3,6-脱水-β-D-吡喃葡萄糖苷比 (4)C(1) 构象中的甲基葡萄糖苷水解快 200-400 倍,而甲基 3,6-脱水-β-D-吡喃半乳糖苷,处于 B(1,4) 构象中,反应性低于甲基 β-D-吡喃半乳糖苷。甲基(3,6-脱水-β-D-吡喃葡萄糖基)-(1 --> 6)-α-D-吡喃葡萄糖苷,甲基(3,6-脱水-α-D-吡喃葡萄糖基)-(1 --> 6 )-α-D-吡喃葡萄糖基-(1 --> 6)-α-D-吡喃葡萄糖苷和甲基(3,6-脱水-β-D-吡喃葡萄糖基)-(1 --> 6)-α-D-吡喃葡萄糖基-(1 --> 6)-α-D-吡喃葡萄糖苷被制备并且发现在脱水残基处选择性地反应。糖苷的 (1)C(4) 构象异构体是高活性物种的发现符合并支持先前的结果,表明轴向