A new look at acid catalyzed deacetylation of carbohydrates: A regioselective synthesis and reactivity of 2-O-acetyl aryl glycopyranosides
作者:Elena V. Stepanova、Marina O. Nagornaya、Victor D. Filimonov、Rashid R. Valiev、Maxim L. Belyanin、Anna K. Drozdova、Victor N. Cherepanov
DOI:10.1016/j.carres.2018.02.003
日期:2018.3
groups of per - acetylated aryl glycosides have different reactivity during the acidic deacetylation using HCl/EtOH in CHCl3, which leads to preferential deacetylation at O-3, O-4 and O-6. Thereby, the one-step preparation of 2-O-acetyl aryl glycosides with simple aglycon was accomplished for the first time. It was proved that the found reagent is to be general and unique for the preparation of series of
在目前的工作中,我们报道过乙酰化的芳基糖苷的乙酰基在使用HCl / EtOH的CHCl3进行酸性脱乙酰作用期间具有不同的反应性,从而导致O-3,O-4和O-6优先脱乙酰。由此,首次完成了具有简单糖苷配基的2-O-乙酰基芳基糖苷的一步制备。证明了所发现的试剂对于制备一系列2-О-乙酰基芳基糖苷是通用且独特的。我们已经通过动力学实验确定了碳水化合物部分和糖苷配基对脱乙酰基反应选择性的影响。使用DFT / B3LYP / 6-31G(d,p)和半经验АМ1方法,我们发现最高的激活势垒是针对2-О-乙酰基的。这完全解释了2-О-乙酰基的最低反应性。