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A short synthesis of Hagen’s gland lactones 1 and 2 from commercially available pentanal and heptanal, respectively, is outlined. The approach relies on sequential ring closing metathesis and intramolecular oxy-Michael addition as the key transformations.
A simple and straightforward methodology of general utility to construct sterically encumbered furo[3,2-b]furanone scaffolds present in a diverse range of bioactive natural products is delineated. The methodology emanates from readily available Morita–Baylis–Hillman adducts and employs sequential ring closing metathesis and oxy-Michael addition cascade as the key steps.
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