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Synlett 1990; 1990(11): 673-674
DOI: 10.1055/s-1990-21206
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An Easy Route to Acylfurans and Dihydrofurans by Intramolecular Cyclization of Substituted 1,3-Diketones

José Barluenga* , Miguel Tomás, Angel Suárez-Sobrino
  • *Departamento de Química Organometálica, Facultad de Química, Universidad de Oviedo, E-33071 Oviedo, Spain
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Publication Date:
08 March 2002 (online)

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The synthesis of 3-acylfurans 5 and 4-acyl-2,3-dihydrofurans 6 is achieved by intramolecular cyclization of 2-(2-alkynyl or 2-alkenyl)-substituted 1, 3-diketones 3 and 4 prepared from 4-amino-1-azabutadienes. The reaction, which involves either an exo-dig or exo-trig ring closure, is promoted by polyphosphoric acid.

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