Synlett 2005(10): 1575-1578  
DOI: 10.1055/s-2005-869865
LETTER
© Georg Thieme Verlag Stuttgart · New York

Acid-Mediated Highly Regioselective Oxidation of Substituted Furans: A Simple and Direct Entry to Substituted Butenolides

Juan P. Ceñala, Carlos R. Carrerasa, Carlos E. Tonna, Juan I. Padrónb, Miguel A. Ramírezb, David D. Díazb, Fernando García-Telladoc, Victor S. Martín*b
a INTEQUI-CONICET-Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, Chacabuco y Pedernera, 5700-San Luis, Argentina
b Instituto Universitario de Bioorgánica ‘Antonio González’, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez, 2, 38206 La Laguna, Tenerife, Canary Islands, Spain
Fax: +34(922)318571; e-Mail: vmartin@ull.es;
c Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas, Avda. Astrofísico Francisco Sánchez, 3, 38206 La Laguna, Tenerife, Canary Islands, Spain
Further Information

Publication History

Received 11 February 2005
Publication Date:
07 June 2005 (online)

Abstract

The scope and limitations of an expeditious synthesis of substituted butenolides from 3-substituted or 3,4-disubstituted furans is described. The entire process embodies a controlled oxidation of the furan core to a 2,5-dialkoxy-dihydrofuran intermediate and a regioselective acid-catalyzed hydrolysis to the butenolide ­derivative. 3-Substituted furans yield exclusively 2-substituted butenolides. Calculations studies provide substantiation of a proposed mechanism.

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1

Instituto Canario de Investigación del Cáncer, www.icic.es.

19

Theoretical calculations details are available from the authors upon request.

20

Obtained by integration of the electronic density over the considered atomic basin.