Radical cyclization cascade reactions of epoxycyclohexanes possessing alkene and alkyne side chains have been achieved. Sequential 5‐ or 6‐exo‐trig/5‐exo‐dig reactions triggered by epoxide ring opening with Cp2TiCl were found to provide a useful unified synthetic method for generating the carbon skeletons of clovane and cedrane, two tricyclic sesquiterpenes. The factors responsible for the development of stereoselectivity during cyclization are also discussed.
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Suzuki et al. (2024) studied this question.
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