26. Oxidative hydroxylation of heterocyclic β-dicarbonylcompounds
Stadlbauer W., Kappe Th.
Monatsh. Chem. 116 (1985) 1005-1015
Abstract: 3-Substituted 4-hydroxy-2-quinolones (1), 5-substituted barbituric acids (3)
and 4-substituted pyrazolidine-2,4-diones were oxidized to yield the corresponding
hydroxy derivatives 2, 4 or 9, respectively.