Pd(II)-Catalyzed CH Activation of Styrylindoles: Short, Efficient, and Regioselective Synthesis of Functionalized Carbazoles
作者:Rakesh K. Saunthwal、Monika Patel、Sonu Kumar、Abhinandan K. Danodia、Akhilesh K. Verma
DOI:10.1002/chem.201503657
日期:2015.12.14
A novel PdII‐catalyzed approach for the direct synthesis of highly functionalized carbazoles from unprotected styrylindoles has been developed. The reaction features a variety of olefin substrates, which are readily switchable by subtle tuning of the reaction conditions. Investigations of the mechanism suggest that the CHactivation proceeds via enamine formation.
Synthesis of substituted carbazoles via electrocyclization of in situ generated enamines from 1-phenylsulfonyl-2/(3)-methyl-3/(2)-vinylindoles and DMF·DMA/DMA·DMA
作者:Radhakrishnan Sureshbabu、Ramalingam Balamurugan、Arasambattu K. Mohanakrishnan
DOI:10.1016/j.tet.2009.03.010
日期:2009.5
Interaction of 2/(3)-methyl-3/(2)-vinylindoles and DMF center dot DMA/DMA center dot DMA at 110 degrees C led to the in situ generation of enamines, which on concurrent electrocyclization followed by subsequent aromatization afforded substituted carbazoles. (C) 2009 Elsevier Ltd. All rights reserved.
Tandem [2 + 2] Cycloaddition/Rearrangement toward Carbazoles by Visible-Light Photocatalysis
the first example of the synthesis of carbazoles via oxidative cyclization of 3-alkenylindoles with styrenes under visible light. The irradiation of a catalytic amount of [Ir(dtbbpy)(ppy)2][PF6] as the photocatalyst enables various 3-alkenylindoles and styrenes to undergo tandem [2 + 2] cycloaddition/rearrangement, thereby leading to carbazole derivatives in good to excellent yields under aerobic conditions