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Recent advances in synthetic methods to access azetines. A. Copper-catalyzed enantioselective [3+1]-cycloaddition to access tetrasubstituted 2-azetines. B. Ring-expansion of aziridines via rhodium carbenoids to access 1-azetines. C. Lewis acid catalyzed [2+2]-cycloaddition to access 2-azetines. D. Flow synthesis of 2-substituted 2-azetines via formation of α-lithiated-2-azetines. E. Divergent synthesis of 1- and 2-azetines via a [2+2]-photocycloaddition.
