Nickel-Catalyzed Cyclization Strategy for the Synthesis of Pyrroloquinolines, Indoloquinolines, and Indoloisoquinolines
作者:Sampath Thavaselvan、Kanniyappan Parthasarathy
DOI:10.1021/acs.orglett.0c01055
日期:2020.5.15
An inexpensive and benchtop stable Ni-catalyst/Zn system for the synthesis of pyrrolo/indoloquinolines and indolo[2,1-a]isoquinolines is explored. This platform provides a one-pot entry for the preparation of various pyrrolo and indoloquinolines/isoquinolines, which involves successive C-C and C-N bond formation, respectively. In addition, we have also performed the preliminary photophysical studies
Synthesis of pyrrolo[1,2-a]quinolines and ullazines by visible light mediated one- and twofold annulation of N-arylpyrroles with arylalkynes
作者:Amrita Das、Indrajit Ghosh、Burkhard König
DOI:10.1039/c6cc04366f
日期:——
Fused nitrogen heterocycles and ullazines are synthesised by one and twofold annulation of N-arylpyrroles with arylalkynes using metal free visible light photocatalysis.
Palladium-Catalyzed Sonogashira-Coupling Conjoined C–H Activation: A Regioselective Tandem Strategy to Access Indolo- and Pyrrolo[1,2-<i>a</i>]quinolines
作者:Satya Prakash Shukla、Rakesh K. Tiwari、Akhilesh K. Verma
DOI:10.1021/jo302112a
日期:2012.11.16
An operationally simple approach for the regioselective tandem synthesis of indolo[1,2-a]quinolines 4a-v and pyrrolo[1,2-a]quinolines 5a-k from 1-(2-bromophenyl)-1H-indole/pyrrole/imidazole 1a-c, 2a,b by the palladium-catalyzed sequential C-C bond formation is described. The developed approach involves the palladium-catalyzed Sonogashira coupling followed by the intramolecular C-C bond formation via C-H activation, which leads to the formation of 6-endo-dig cyclized product. This synthetic methodology accommodates wide functional group variation on alkyne, which proves to be advantageous for the structural and biological activity assessments.
Benzotriazole: an efficient ligand for the copper-catalyzed N-arylation of indoles
作者:Akhilesh Kumar Verma、Jaspal Singh、Richard C. Larock
DOI:10.1016/j.tet.2009.07.050
日期:2009.10
A general, efficient, and inexpensive method for the N-arylation of indoles using a catalytic system derived from Cul and benzotriazole is reported. Selective mono N-arylation of indoles with ortho-di-haloarenes has also been successfully achieved in good yields using this protocol. (C) 2009 Published by Elsevier Ltd.