title: Free radical reaction between 2-benzoyl-1,4-benzoquinones and 1,3-dicarbonyl compounds.
abstract: A manganese(III)-mediated reaction between 2-benzoyl-1,4-benzoquinones and 1,3-dicarbonyl compounds that produces benzo[c]furan-4,7-diones and anthracene-1,4-diones with high chemoselectivity is described. With ethyl butyrylacetate, by changing the solvent, benzo[c]furan-4,7-diones and anthracene-1,4-diones can be generated in high chemoselectivities. With ethyl benzoylacetate, N ,N-dimethyl acetoacetamide and 1,3-diones, benzo[c]furan-4,7-diones were produced effectively with high selectivity. With 2-alkyl-5-benzoyl-1,4-benzoquinones, the regioselectivity of this reaction was also studied and the corresponding benzo[c]furan-4,7-dione and anthracene-1,4-dione derivatives were obtained in high regioselectivity.
authors.affiliation: Department of Chemistry, National Cheng Kung University, Tainan, Taiwan 70101, Republic of China.
authors.forename: Kuang-Po
authors.initials: KP
authors.lastname: Chen
authors.forename: Hen-Qun
authors.initials: HQ
authors.lastname: Lee
authors.forename: Yu-Chih
authors.initials: YC
authors.lastname: Cheng
authors.forename: Che-Ping
authors.initials: CP
authors.lastname: Chuang