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Sequential coupling/desilylation–coupling/cyclization in a single pot under Pd/C–Cu catalysis: Synthesis of 2-(hetero)aryl indoles†‡
R. Mohan Rao,Upendar Reddy CH,Alinakhi,Naveen Mulakayala,Mallika Alvala,M. K. Arunasree,Rajamohan R. Poondra,Javed Iqbal,Manojit Pal
Organic & Biomolecular Chemistry Pub Date : 02/23/2011 00:00:00 , DOI:10.1039/C0OB01161D
Abstract

A new one-pot synthesis of 2-(hetero)aryl indolesvia sequential C–C coupling followed by C–Si bond cleavage and a subsequent tandem C–C/C–N bond forming reaction is described. A variety of functionalized indole derivatives were prepared by conducting this four step reaction under Pd/C–Cu catalysis. The methodology involved coupling of (trimethylsilyl)acetylene with iodoarenes in the presence of 10% Pd/C–CuI–PPh3 and triethylamine in MeOH, followed by treating the reaction mixture with K2CO3 in aqueous MeOH, and finally coupling with o-iodoanilides. The single crystal X-ray data of a synthesized indole derivative is presented. Application of the methodology, in vitro pharmacological properties of the synthesized compound, along with a docking study is described.

Graphical abstract: Sequential coupling/desilylation–coupling/cyclization in a single pot under Pd/C–Cu catalysis: Synthesis of 2-(hetero)aryl indoles
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