ChemInform Abstract: Formal Aza-[3 + 3] versus Aza-[3 + 2] Cycloadditions of Heterocyclic Enaminones with Maleic Anhydride and Maleimides: Skeletally Diverse Synthesis of Pyrrolizidinones, Indolizidinones, and Pyrroloazepinones.

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