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General approaches to synthesize azetines generally fall into three categories. A. [2+2]-cycloaddition strategies can yield either 1- or 2-azetines depending on the choice of cycloaddition partners. B. Elimination of a leaving group on an azetidine compound can yield either 1-azetines or 2-azetines. C. Ring expansions of three membered rings can form 1-azetines from azirines or cyclopropyl azides, and 2-azetines from diazoaziridines.
