Abstract
An asymmetric synthesis of indolines has been described by using an Ir-catalyzed asymmetric hydrogenation 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 functional group tolerance, thus providing a concise and efficient approach toward chiral indoline and their derivatives with up to 94 % ee.
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