Abstract
The putative oxyallyl cation intermediate generated following Nazarov cyclization of dienone has been successfully intercepted with potassium alkynyltrifluoroborates which act as σ-nucleophiles in the presence of BF3·Et2O. This new trapping modality allowed unprecedented introduction of an alkynyl moiety to the cyclopentanone framework by means of an interrupted Nazarov reaction. The α-alkynyl cyclopentanone product can be further transformed into an array of densely functionalized cyclic compounds.
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