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Metal-free coupling of azoles with 2- and 3-haloindoles providing access to novel 2- or 3-(azol-1-yl)indole derivatives.

Research paper by Martin M Poirier, Sébastien S Goudreau, Jason J Poulin, Jolaine J Savoie, Pierre L PL Beaulieu

Indexed on: 20 Apr '10Published on: 20 Apr '10Published in: Organic Letters



Abstract

Thermal or microwave-mediated heating of 2- or 3-haloindoles with azoles (pK(a) < 8) provides a straightforward, metal-free, and environmentally friendly access to novel 2-(azol-1-yl)indoles. Furthermore, previously unknown 2,3-bis(azolyl-1-yl)indoles can be prepared from 2,3-dihaloindoles by sequential reaction with two distinct azoles. This operationally simple acid-catalyzed process delivers novel indole derivatives in fair to excellent yields and expands the chemical diversity of substitutions that can be introduced on this medicinally important scaffold.