A new type of intermolecular (4 + 2) cycloaddition, based on a gold-catalyzed reaction between allenamides and acyclic conjugated dienes, is reported. The annulation, which fails under standard Diels–Alder conditions, provides a straight entry to a variety of differently substituted cyclohexenes, and takes place with excellent regio- and diastereoselectivity.
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Faustino et al. (2011) studied this question.
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