Abstract
Intra- and intermolecular [2 + 2] photocycloadditions on 3-aminocyclopentenones are described. Fragmentation of the resultant aminocyclobutanes by retro-Mannich reactions leads to the formation of diketones, ketoimines or conjugated enaminones, the latter of which can undergo further reactions to afford γ-aminotropones and Diels–Alder adducts.
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