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Becker, Marc R; Wearing, Emily R; Schindler, Corinna S
Nature chemistry, 10/2020, Letnik: 12, Številka: 10Journal Article
Intermolecular 2+2 photocycloadditions represent a powerful method for the synthesis of highly strained, four-membered rings. Although this approach is commonly employed for the synthesis of oxetanes and cyclobutanes, the synthesis of azetidines via intermolecular aza Paternò-Büchi reactions remains highly underdeveloped. Here we report a visible-light-mediated intermolecular aza Paternò-Büchi reaction that utilizes the unique triplet state reactivity of oximes, specifically 2-isoxazoline-3-carboxylates. The reactivity of this class of oximes can be harnessed via the triplet energy transfer from a commercially available iridium photocatalyst and allows for 2+2 cycloaddition with a wide range of alkenes. This approach is characterized by its operational simplicity, mild conditions and broad scope, and allows for the synthesis of highly functionalized azetidines from readily available precursors. Importantly, the accessible azetidine products can be readily converted into free, unprotected azetidines, which represents a new approach to access these highly desirable synthetic targets.
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