Irradiation of 2-alkoxy-3-(2-oxoalkyl)-1,4-naphthoquinone in benzene gave a novel cyclization product, (1,3)dioxepino-1,4-naphthoquinone via intramolecular H-abstraction reaction.
Photoinduced Cyclization of 2-Acetonyl-3-alkoxy-1,4-naphthoquinones: Formation of 2-Alkyl-Substituted 4-Methylnaphtho[2,3-<i>d</i>]-1,3-dioxepin-6,11-diones
作者:Katsuhiko Nakagawa
DOI:10.1246/bcsj.64.2852
日期:1991.9
Irradiation of 2-acetonyl-3-alkoxy-1,4-naphthoquinones in benzene gave 2-alkyl-substituted 4-methylnaphtho[2,3-d]-1,3-dioxepin-6,11-dione and 2-acetonyl-3-hydroxy-1,4-naphthoquinone via intramolecular hydrogen-abstraction reaction. Irradiation of quinones in methanol, however, gave the latter product exclusively.