A synthetic method for highly substituted pyridinium salts from the multicomponent reaction of vinyl ketones/aldehydes, amines, and alkynes using a rhodium catalyst is demonstrated. The catalytic reaction proceeds via an in situ generated imine-assisted RhIII-catalyzed vinylic C–H activation.
A Rh-catalyzed pot and step economic synthesis of aza-polycyclic aromatic hydrocarbons (N-PAHs) from readily available aryl ketones and alkynes has been disclosed. Additionally, a novel synthetic application of the well-known aminating reagent hydroxylamine-O-sulfonic acid (HOSA) has been explored as an in situ redox-neutral directinggroup for the formation of N-PAHs via isoquinoline. Multiple bond
Synthesis of Isoquinolines and Heterocycle-Fused Pyridines via Three-Component Cascade Reaction of Aryl Ketones, Hydroxylamine, and Alkynes
作者:Liyao Zheng、Jia Ju、Yunhui Bin、Ruimao Hua
DOI:10.1021/jo3010414
日期:2012.7.6
An efficient one-pot synthesis of isoquinolines and heterocycle-fused pyridines by three-component reaction of aryl ketones, hydroxylamine, and alkynes is developed. The reaction involves condensation of aryl ketones and hydroxylamine, rhodium(III)-catalyzed C–H bond activation of the in situ generated aryl ketone oximes, and cyclization with internal alkynes. This protocol enables rapid assembly of
通过芳基酮,羟胺和炔烃的三组分反应,有效地一锅法合成异喹啉和杂环稠合吡啶。该反应涉及芳基酮和羟胺的缩合,铑(III)催化原位生成的芳基酮肟的C–H键活化以及与内部炔烃的环化作用。该协议能够从容易获得的底物中快速组装多取代的异喹啉以及γ-咔啉,呋喃[2,3- c ]吡啶,噻吩并[2,3- c ]吡啶和苯并呋喃[2,3- c ]吡啶。
Rhodium-Catalyzed Synthesis of Isoquinolines and Indenes from Benzylidenehydrazones and Internal Alkynes
作者:Xiao-Cheng Huang、Xu-Heng Yang、Ren-Jie Song、Jin-Heng Li
DOI:10.1021/jo402497v
日期:2014.2.7
presented for the selective assembly of isoquinolines and indenes by rhodium-catalyzed tandem cyclization of benzylidenehydrazones with internal alkynes. This method involves the selective cleavage of the N–N bond and the C═N bonds and is dependent on the substituents of the benzylidenehydrazone.
Easy Access to Isoquinolines and Tetrahydroquinolines from Ketoximes and Alkynes via Rhodium-Catalyzed C−H Bond Activation
作者:Kanniyappan Parthasarathy、Chien-Hong Cheng
DOI:10.1021/jo902084j
日期:2009.12.18
herein is a convenient and highly regioselective synthesis of substituted isoquinoline derivatives from various aromatic ketoximes and alkynes via a one-pot, rhodium-catalyzed C−H bondactivation. In addition, tetrahydroquinoline derivatives are formed in good yields from 2-arylidene-1-cyclohexanone oximes possessing an exocyclic double bond and from tetrahydroxanthone oximes. A possible mechanism is