When 4-acetyl- or 4-methyl-5,6-dihydrofuro[3,2-b]pyridin-2(4H)-one or 4-acetyl-7-bromo-1,4,5,6-tetrahydropyrrolo[3,2-b]pyridin-2-one s irradiated, dimeric products are obtained. Irradiation of 5,6-dihydrofuro[3,2-b]pyridin-2(4H)-one in benzene gives a dimer, whereas irradiation in methanol causes electrocyclic ring opening, giving 3-methoxymethylaminohexa-2,4- and -2,5-dien-4-olides [(15)–(17)].
G. Jones and J. R. Phipps, J. Chem. Soc., Perkin Trans. 1, 1975, 458 DOI: 10.1039/P19750000458
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