Intramolecular Pauson-Khand Reaction of 3-Alkynyl-1-Alkylideneclycles: A Convenient Synthesis of [5.n.1.01,5] Tricyclic Compounds
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An intramolecular Pauson-Khand reaction of various 3-alkynyl-1- alkylidenecyclic compounds was performed to give the corresponding [5.n.1.01,5] tricyclic compounds (n = 2-4). A facile construction of the core structure in cedrene terpenoids was also investigated in detail and formal total synthesis of α- and β-cedrenes was accomplished. pp.827-844