An Efficient Synthesis of 4,4-Disubstituted 5,6-Dihydro-3(4H)-pyridinone 1-Oxides by Thermal Cyclisation of Unsaturated 1,2-Hydroxyiminoketones

Abstract
3,3-Disubstituted 1,2-hydroxyiminoketones 6 with the hydroxyimino group distal and δ,ε to an olefinic bond undergo thermal cyclisation to produce high yields of 4,4-disubstituted 5,6-dihydro-3(4H)-pyridinone 1-oxides 7.

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