Abstract

AbstractThe synthesis of 2‐exo‐substituted brendene derivatives 3a, 5a and 6 as well as 2,5‐disubstituted brendene derivative 7 is described, starting from the readily available tetracyclo‐[4.3.0.02,9.04,8]nonanone 1. The cationic rearrangement reactions of tetracyclic skeleton of 1 and 2 have been studied. The mechanism of these reactions is discussed. The preparation of inaccessible exo‐alcohol 2a by reduction of ketone 1 is presented.

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