Asymmetric <i>N</i>‐Alkylation of 1<i>H</i>‐Indoles via Carbene Insertion Reaction
作者:Quanxin Peng、Meirong Huang、Guangyang Xu、Yan Zhu、Ying Shao、Shengbiao Tang、Xinhao Zhang、Jiangtao Sun
DOI:10.1002/anie.202313091
日期:2023.11.20
An intermolecular enantioselective N-alkylation reaction of 1H-indoles has been developed enabled by cooperativerhodium and chiralphosphoricacidcatalyzed N−H bond insertionreaction. The reaction provides the N-alkyl indoles with a newly formed stereocenter adjacent to the indole nitrogen atom in good yields (up to 95 %) with excellent enantioselectivities (up to >99 % ee).
通过铑和手性磷酸协同催化的N −H键插入反应,开发了1 H -吲哚的分子间对映选择性 N - 烷基化反应。该反应以良好的收率(高达 95%)和优异的对映选择性(高达 >99% ee)提供了具有与吲哚氮原子相邻的新形成的立构中心的 N-烷基吲哚。
Single-Operation Deracemization of 3H-Indolines and Tetrahydroquinolines Enabled by Phase Separation
作者:Aaron D. Lackner、Andrew V. Samant、F. Dean Toste
DOI:10.1021/ja4082827
日期:2013.9.25
The single-operation deracemization of 3H indolines and tetrahydroquinolines is described. An asymmetric redox approach was employed, in which a phosphoric acid catalyst, oxidant, and reductant are present in the reaction mixture. The simultaneous presence of both oxidant and reductant was enabled by phase separation and resulted in the isolation of highly enantioenriched starting materials in high yields.