Catalytic Enantioselective Amide Allylation of Isatins and Its Application in the Synthesis of 2-Oxindole Derivatives Spiro-Fused to the α-Methylene-γ-Butyrolactone Functionality
作者:Masaki Takahashi、Yusuke Murata、Fumitoshi Yagishita、Masami Sakamoto、Tetsuya Sengoku、Hidemi Yoda
DOI:10.1002/chem.201403357
日期:2014.8.25
enantioselectivities (up to >99 %, 99 % ee) of variously substituted homoallylic alcohols. Several mechanistic investigations demonstrated that the substrate–reagent hydrogen‐bond interaction plays a critical role in the formation of the key transition states to result in enhanced catalytic reaction. The success of this approach allowed convenient access to chiral 2‐oxindoles spiro‐fused to the α‐methylene‐γ‐butyrolactone
本文全面介绍了使用铟基手性催化剂探索各种靛红催化对映选择性酰胺烯丙基化的潜在效用的工作。对各种靛红底物和含NH的甲锡烷基化试剂的调查显示,该反应的范围非常广,可产生极高的收率和对映选择性(高达> 99%,99% ee))的各种取代的均丙醇。几项机理研究表明,底物与试剂的氢键相互作用在关键过渡态的形成中起着关键作用,从而导致催化反应的增强。这种方法的成功使人们可以方便地获得螺合了α-亚甲基-γ-丁内酯官能团的手性2-氧吲哚和几乎呈对映纯形式的卤代衍生物,从而突显了这种合成方法的通用性,可提供多种抗肿瘤药物候选物和药学上有意义的化合物。