Single-Operation Deracemization of 3H-Indolines and Tetrahydroquinolines Enabled by Phase Separation
摘要:
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.
An asymmetric synthesis of indolines has been described by using an Ir-catalyzed asymmetrichydrogenation of 2-aryl-3H-indoles with unsymmetrical hybrid chiral phosphine-phosphoramidite ligands. The result indicated that the catalytic performance could be significantly improved by the H8-binaphthyl moiety on this ligand motif. This method is characterized by a high asymmetric induction and a reasonable
通过使用不对称杂化手性膦-亚磷酰胺配体对 2-芳基-3 H-吲哚进行 Ir 催化不对称氢化,描述了二氢吲哚的不对称合成。结果表明,该配体基序上的H 8 -联萘基部分可以显着提高催化性能。该方法具有高度不对称诱导和合理的官能团耐受性的特点,从而为手性二氢吲哚及其衍生物提供了一种简洁有效的方法,其ee高达94%。