An efficient synthesis of polycyclic molecules has been performed by a sequence involving palladium-catalyzed C-H activation and [4 + 2] cycloaddition. The intermediate benzocyclobutenes underwent a microwave-enhanced electrocyclic ring-opening/cycloaddition process with complete torquoselectivity and diastereoselectivity.
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Chaumontet et al. (2009) studied this question.
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