The chemistry of heterocycles. IV. 2H-pyrido[4,3-e]-1,3-oxazine-2,4(3H)-dione,its precursors and some 3-substituted derivatives.

The preparation of 2H-pyrido4, 3-e]-1, 3-oxazine-2, 4(3H)-dione (II) and the anisoyl, benzoyl, 4-chlorobenzoyl, trans-cinnamoyl, 3, 5-dinitrobenzoyl, 2-furoyl, and 2-naphthoyl derivatives substituted at position 3 of II together with their infrared and ultraviolet spectra are described. The 3-substituted 2 and 4-(2-pyridylethyl) and hydroxymethyl derivatives of quinolinimide and cinchomeronimide were also prepared and their spectra recorded.