Synthesis 2016; 48(12): 1865-1871
DOI: 10.1055/s-0035-1560432
special topic
© Georg Thieme Verlag Stuttgart · New York

Furans to Benzofurans: Intramolecular Cross-Benzoin Reactions Catalysed by N-Heterocyclic Carbenes

Autoren

  • Rajendra P. Shirke

  • Virsinha Reddy

  • R. Vijaya Anand

  • S. S. V. Ramasastry*

Weitere Informationen

Publikationsverlauf

Received: 24. Februar 2016

Accepted after revision: 08. März 2016

Publikationsdatum:
15. April 2016 (online)


Graphical Abstract

Abstract

The first synthesis of dihydrobenzofuranones and benzofurans based on an intramolecular cross-benzoin reaction has been reported. Commercially available 3-furan carboxaldehydes are readily α-alkylated to furnish 3-formyl-2-furylcarbinols, which are further elaborated to the synthesis of benzofurans in good yields through sequential bismuth(III) chloride catalysed furfurylation and a novel NHC-promoted intramolecular cross-benzoin condensation reaction.

Supporting Information