Abstract
Abstract Dienic acid 5 was transformed into tricyclic ketone 6 in four steps using the cyclopentene annulation of dienic diazoketones. Hydrogenation of 6 under several conditions yielded ketone 7a which was further transformed into β-epiisocomene 4 and epiisocomene 3, contrary to the results previously reported by Samir Chatterjee.
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