Synlett 2013; 24(10): 1238-1242
DOI: 10.1055/s-0033-1338946
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© Georg Thieme Verlag Stuttgart · New York

Gold(I)-Catalyzed Intramolecular [4+3]-Cycloaddition Reactions with Furan Propargyl Esters as the Substrates: Carbenoid vs. Stabilized Allyl Cation

Benjamin W. Gung*
Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, USA   Fax: +1(513)5295715   eMail: gungbw@muohio.edu
,
Ryan C. Conyers
Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, USA   Fax: +1(513)5295715   eMail: gungbw@muohio.edu
,
Josh Wonser
Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, USA   Fax: +1(513)5295715   eMail: gungbw@muohio.edu
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Publikationsverlauf

Received: 02. April 2013

Accepted after revision: 22. April 2013

Publikationsdatum:
28. Mai 2013 (online)


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Abstract

The tricyclic ring system with an oxabicyclo[3.2.1]octadiene and a fused six-membered ring was produced efficiently using the readily available propargyl ester furan substrate in the presence of a Au(I) complex. The reaction involves a tandem 3,3-rearrangement of the propargyl ester followed by an intramolecular [4+3]-cycloaddition reaction. Both the primary ligand of the gold complex (N-heterocyclic carbene; NHC) and a neutral dynamic ligand (PhCN) are important for the success of the reaction.

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