Synthesis of New Heterocycles through a Cation-Driven Tandem Ring-Enlargement−Annulation Reaction

The thionium ion, generated through a cyclopropylcarbinyl-cyclobutyl ring expansion, is, for the first time, intramolecularly intercepted by activated aromatic rings to generate new versatile 2a-methyl-8b-(phenylsulfanyl-1,2a,3,8b-tetrahydro-2H-cyclobuta[c]chromenes.

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Bibliographische Detailangaben
Veröffentlicht in:	Organic letters 2002-07, Vol.4 (15), p.2565-2567
Hauptverfasser:	Bernard, Angela M, Cadoni, Enzo, Frongia, Angelo, Piras, Pier P, Secci, Francesco
Format:	Artikel
Sprache:	eng
Schlagworte:	Benzopyrans - chemical synthesis Biological Factors - chemical synthesis Cations - chemistry Cyclization Cyclobutanes - chemical synthesis Heterocyclic Compounds - chemical synthesis Quaternary Ammonium Compounds - chemistry
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Beschreibung
Zusammenfassung:	The thionium ion, generated through a cyclopropylcarbinyl-cyclobutyl ring expansion, is, for the first time, intramolecularly intercepted by activated aromatic rings to generate new versatile 2a-methyl-8b-(phenylsulfanyl-1,2a,3,8b-tetrahydro-2H-cyclobuta[c]chromenes.
ISSN:	1523-7060 1523-7052
DOI:	10.1021/ol026199x