Synthesis 2014; 46(22): 3121-3132
DOI: 10.1055/s-0034-1378454
paper
© Georg Thieme Verlag Stuttgart · New York

A Palladium on Carbon Catalyzed One-Pot Synthesis of Substituted Benzimidazoles

Soumen Joardar*
a   Chembiotek, TCG Lifesciences Ltd., Kolkata-700 091, West Bengal, India
b   Department of Chemistry, University of Kalyani, Kalyani-741 235, West Bengal, India
,
Anjan Bhattacharyya
c   Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur-741 252, Nadia, West Bengal, India   Email: joardarsoumen@gmail.com   Fax: +91(33)25828282
,
Saktipada Das*
b   Department of Chemistry, University of Kalyani, Kalyani-741 235, West Bengal, India
› Author Affiliations
Further Information

Publication History

Received: 10 December 2013

Accepted after revision: 22 June 2014

Publication Date:
30 July 2014 (online)


Abstract

A new and efficient palladium on carbon catalyzed one-pot intramolecular nitro reduction/cyclization reaction has been developed for the preparation of a series of substituted benzimidazoles, including some novel ring-fused [1,2-a]-tricyclic, [1,2-a]-tetracyclic, and chiral benzimidazoles. The main advantages of this method are the mild and simple reaction conditions, the easy isolation of the products, and the excellent yields. The reaction has the potential to be used as a general procedure for the preparation of 7-aminobenzimidazoles in good yields. A plausible mechanism for the reaction is proposed.

Supporting Information