Ut. Bhalerao et A. Krishnaiah, A MILD AND EFFICIENT METHOD FOR THE DEHYDROGENATION OF DIHYDROPYRIDO-PYRIMIDINONES AND RELATED-COMPOUNDS BY USING ACTIVE MNO2, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 34(7), 1995, pp. 587-590
Various fluorinated dihydropyrido[2,3-d]pyrimidin-4-ones (3) are conve
niently oxidised to respective pyrido[2,3-d]pyrimidin-4-(3H)-ones (4)
in quantitative yields by using active MnO2. This method has been gene
ralised by applying to other related heterocyclic compounds: