Palladium-catalyzed asymmetric allylic alkylation of 3-amino-2-oxindoles: Synthesis of 3-allyl-3-amino-2-oxindoles
作者:Nandarapu Kumarswamyreddy、Samydurai Jayakumar、Venkitasamy Kesavan
DOI:10.1016/j.tetlet.2021.153385
日期:2021.10
bi(oxazoline) ligand with palladium (II) species catalyzed asymmetric allylic alkylation reaction to access highly valuable 3-allyl-3-amino-2-oxindoles with vicinal quaternary and tertiary stereocenters in very good yields (up to 91%) and excellent enantioselectivity (up to 98% ee) with moderate to good diastereoselectivity (up to 5:1). The synthetic utility of 3-allyl-3-amino-2-oxindole was further
酒石酸衍生的双(恶唑啉)配体与钯 (II) 物质催化不对称烯丙基烷基化反应,以非常好的产率(高达 91%)获得具有邻位季和叔立体中心的高价值 3-allyl-3-amino-2-oxindoles 和出色的对映选择性(高达 98% ee)和中等至良好的非对映选择性(高达 5:1)。进一步证明了 3-allyl-3-amino-2-oxindole 的合成效用以良好的立体选择性(dr = 8:1 和80% ee) 通过无金属分子内碘环化反应。