Irradiation of 4-methoxy-2-quinolone (IV) in methanol in the presence of substituted ethylenes provided intermolecular addition products. The cycloaddition reaction was shown to be regioselective giving in all cases 5-substituted 3, 6-dihydrocyclobuta [c]-2-quinolones (V). Base treatment of these cycloadducts afforded the corresponding cyclobuta [c]-2-quinolones (VI).
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Kaneko et al. (1979) studied this question.
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