Gold(III)-Catalyzed Glycosylation using Phenylpropiolate Glycosides: Phenylpropiolic Acid, An Easily Separable and Reusable Leaving Group
作者:Mukta Shaw、Rima Thakur、Amit Kumar
DOI:10.1021/acs.joc.8b02422
日期:2019.1.18
synthesized benchtop stable phenylpropiolate glycosyl (PPG) donors. Gold(III)-catalyzed activation of PPGs proceeds well with various carbohydrate and noncarbohydrate-based glycosyl acceptors and leads to their corresponding O/N-glycosides in good to excellent yields with regeneration of reusable and easily separable phenylpropiolic acid. Differentially protected PPGs reacted well under the optimized reaction
使用新合成的台式稳定苯丙酸苯丙酯糖基(PPG)供体,开发了一种有效且操作简单的金(III)催化的糖基化方案。金(III)催化的PPG活化与各种基于碳水化合物和非碳水化合物的糖基受体进行得很好,并导致其相应的O / N-糖苷的收率好至极好,并具有可重复使用和易于分离的苯丙酸的再生。差异保护的PPG在优化的反应条件下反应良好。特别地,在甘露糖基和鼠李糖基PPG供体上观察到良好的异头选择性。初步的机理研究表明,与酯基相邻的三键的存在对于激活至关重要,并且基于PPG的供体显示出比类似的乙酸和苯甲酸酯供体更高的反应性。