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An efficient and versatile amine-induced Michael/Conia-ene cascade cyclization reaction has been developed for establishing 6,6- and 5,7-bicyclic fused carbocycles with simple acyclic beta-ketoesters as the substrates in one-pot condition and this new cyclization method has been successfully utilized in a formal synthesis of (+/-)-Clavukerin A.
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Li et al. (2009) studied this question.
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