Irradiation of 4-allyloxy-2-quinolone (1) gave the tetracyclic adduct (2) as the sole product, whereas 4-(but-3-enyloxy)-2-quinolone (7) led to a mixture (ca. 7 : 1) of adducts (8) and (9); base treatment of the adducts (2), (8), and (9) gave rise to the novel 1,2-dihydrocyclobuta[c]quinolin-3(4H)ones (3), (10), and (11) in quantitative yields.
C. Kaneko, T. Naito and M. Somei, J. Chem. Soc., Chem. Commun., 1979, 804 DOI: 10.1039/C39790000804
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