Irradiation of a variety of model spirodiones related to the antitumour antibiotic Fredericamycin A in various solvents at 300 nm furnishes quantitative yields of γ-alkylidene γ-butyrolactones; its relevance to the typical shape alteration, photostability and consequent biological response of Fredericamycin is discussed.
B. Pandey, R. S. Reddy and P. Kumar, J. Chem. Soc., Chem. Commun., 1993, 870 DOI: 10.1039/C39930000870
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