Intramolecular photochemical cycloaddition in N-alkenoyldihydropydinones or 3-acetyl-N-alkenoyltetrahydropydines is highly diastereoselective and affords substituted Cyclobutaquinolizidinones and cyclobutaindolizidinones, suitable derivatives of which undergo highly regioselective radical ring opening of the cyclobutane ring.
G. Adamson, A. L. J. Beckwith, M. Kaufmann and A. C. Willis, J. Chem. Soc., Chem. Commun., 1995, 1783 DOI: 10.1039/C39950001783
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