Oxidative Palladium(II)-Catalyzed Dehydrogenative CH/CH Cross-Coupling of 2,3-Substituted Indolines with Arenes at the C7 Position
作者:Lin-Yu Jiao、Martin Oestreich
DOI:10.1002/chem.201302140
日期:2013.8.12
directing group: The C7 position of the indoline nucleus is difficult to address in CH activation. An oxidative palladium(II) catalysis that allows for cross‐dehydrogenativecoupling in that position with activation of the CH bond of the arene component is disclosed here. This CH/CH cross‐coupling is applicable to various indolines acetylated at the nitrogen atom. Substitution at C2 is crucial for
Methyl indolenines (4a-c) and (5a-c) were prepared in high yield by a Fischer indole synthesis reaction of o,m-tolylhydrazine hydrochlorides (1a-b) with isopropyl methyl ketone (2) and 2-methylcyclohexanone (3) in acetic acid at room temperature. o,p- Nitrophenylhydrazines (1c-d) were reacted with 2-methylcyclohexanone (3) in acetic acid at reflux to give nitroindolenines (5d-e), while the attempted
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