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Synthesis of Seven Membered Oxacycles: Recent Developments and New Approaches

AuthorsSinka, Victoria; Martín, Víctor S.; Cruz, Daniel A.; Padrón, Juan I.
Seven‐membered rings
Issue Date24-Jul-2020
CitationEuropean Journal of Organic Chemistry (2020)
AbstractThis minireview focuses on recent advances in the synthesis of seven‐membered ring oxacycles, whether saturated, unsaturated, fused or isolated. We cover a remarkable variety of strategies and methods developed during the past two decades, based mainly on cyclizations, ring‐closing metathesis, conjugate additions, and ring expansions. The cyclizations can be generated directly or triggered through an oxocarbenium ion, carbocation or iminium‐type species. Also discussed are ring‐closing metatheses and conjugate additions, in which the precursor has the functionalities and correct stereochemistry of the final seven‐membered ring oxacycle. Finally, examples of ring expansions are described, predominantly involving cyclopropanes and epoxides. These cases include reactions governed by the intermediate species and others, where the precursor holds the stereochemical information for the final oxacycle.
Publisher version (URL)https://doi.org/10.1002/ejoc.202000850
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