A series of 15 benzene-fused hexahydropyrrolo[1,2-b]isoquinolonic acids with substantial degree of steric encumbrance has been prepared via a novel variant of the Castagnoli-Cushman reaction of homophthalic anhydride (HPA) and various indolenines. The employment of a special kind of a cyclic imine component reaction allowed, for the first time, isolating a Mannich-type adduct between HPA and an imine
Highly Enantioselective Synthesis of Indolines: Asymmetric Hydrogenation at Ambient Temperature and Pressure with Cationic Ruthenium Diamine Catalysts
作者:Zhusheng Yang、Fei Chen、Yanmei He、Nianfa Yang、Qing-Hua Fan
DOI:10.1002/anie.201607890
日期:2016.10.24
asymmetric hydrogenation of 1H‐indoles and 3H‐indoles at ambient temperature and pressure, catalyzed by chiral phosphine‐free cationic ruthenium complexes, has been developed. Excellent enantio‐ and diastereoselectivities (up to >99 % ee, >20:1 d.r.) were obtained for a wide range of indolederivatives, including unprotected 2‐substituted and 2,3‐disubstituted 1H‐indoles, as well as 2‐alkyl‐ and 2‐aryl‐substituted
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%。