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Paper | Regular issue | Vol 68, No. 8, 2006, pp.1659-1668
Published online, 27th June, 2006
DOI: 10.3987/COM-06-10783
Phosphoric Acid-on-Silica Gel: A Green Catalyst for the Synthesis of Symmetrical Bis(indolyl)alkanes

Manas Chakrabarty,* Ratna Mukherjee, Ajanta Mukherji, Shiho Arima, and Yoshihiro Harigaya

*Department of Chemistry, Bose Institute, 93/1, A. P. C. Road, Kolkata-700009, India

Abstract

Orthophosphoric acid, adsorbed on TLC-grade silica gel, has been demonstrated to be an efficient green catalyst for an expeditious and solvent-free one-step synthesis of symmetrical bis(indolyl)alkanes from the reaction of indoles with aryl aldehydes at 60-70 °C.