Photolysis of the enones 4a–c leads to regioselective hydrogen abstraction and subsequent cyclization to furnish the spiro compounds 5a–d, which on further elaboration provide the spiro dione 6, a model for the antitumour antibiotic, fredericamycin-A 1.
B. Pandey, U. R. Khire and N. R. Ayyangar, J. Chem. Soc., Chem. Commun., 1990, 1791 DOI: 10.1039/C39900001791
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