Tetrahedron p. 3187 - 3194 (1988)
Update date:2022-08-03
Topics:
Maki, Yoshifumi
Shimada, Kaoru
Sako, Magoichi
Hirota, Kosaku
Irradiation of 2'-hydroxychalcones (3) with UV-visible light in the presence of heterocycle N-oxides such as pyrimido<5,4-g>pteridine N-oxide (I) results in the formation of the corresponding flavones (4) and flavanones (5).The photooxidative cyclisation of (3) induced by (1) to give (4) most efficiently occurred among the heterocycle N-oxides examined and could be reasonably explained by considering an initial single-electron oxidation of (3) by (1) under the photochemical conditions and subsequent intramolecular cyclisation.
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