Photocyclization of benzalcycloalkanone oximes. A photoannulation route to quinolines.
摘要:
Photolysis of benzalcycloalkanone oxime derivatives in acidic methanol produces quinoline derivatives in good yields. A three step quinoline annulation of cyclic ketones is described.
A panel of six new arene Ru (II)‐NHC complexes 2a‐f, (NHC = 1,3‐diethyl‐(5,6‐dimethyl)benzimidazolin‐2‐ylidene 1a, 1,3‐dicyclohexylmethyl‐(5,6‐dimethyl)benzimidazolin‐2‐ylidene 1b and 1,3‐dibenzyl‐(5,6‐dimethyl)benzimidazolin‐2‐ylidene 1c) were synthesized from the transmetallation reaction of Ag‐NHC with [(η6‐arene)RuCl2]2 and characterized. The ruthenium (II)‐NHC complexes 2a‐f were developed as
Highly Enantioselective Hydrogenation of Quinolines Using Phosphine-Free Chiral Cationic Ruthenium Catalysts: Scope, Mechanism, and Origin of Enantioselectivity
作者:Tianli Wang、Lian-Gang Zhuo、Zhiwei Li、Fei Chen、Ziyuan Ding、Yanmei He、Qing-Hua Fan、Junfeng Xiang、Zhi-Xiang Yu、Albert S. C. Chan
DOI:10.1021/ja2023042
日期:2011.6.29
Asymmetrichydrogenation of quinolines catalyzed by chiralcationic η(6)-arene-N-tosylethylenediamine-Ru(II) complexes have been investigated. A wide range of quinoline derivatives, including 2-alkylquinolines, 2-arylquinolines, and 2-functionalized and 2,3-disubstituted quinoline derivatives, were efficiently hydrogenated to give 1,2,3,4-tetrahydroquinolines with up to >99% ee and full conversions
A blue-light-promoted carbon-carbon double bondisomerization in the absence of any photoredox catalyst is reported. It provides rapid access to a series of quinolines in good to excellent yields under simple aerobic conditions. The protocol is direct, catalyst-free and operationally convenient.