bond of 2-(1-hydroxyalkyl)-1,4-naphthoquinones and 2-(1-amidoalkyl)-1,4-naphthoquinones. This reaction provides an effective method for the synthesis of naphtho[2,3-c]furan-4,9-diones and benzo[f]isoindole-4,9-diones. In the presence of O 2 , manganese(III) acetate oxidation of β-keto esters also generates acyl radicals, which then undergo radical addition to 2-(1-amido-alkyl)-1,4-naphthoquinones, and