The preparation of 2H-pyrido[4,3-el-1,3-oxazine-2,4(3H)-dione (11) 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 a r e described. The 3-substituted 2 and 4-(2-pyridylethyl) and hydroxymethyl derivatives of quinolinimide and cinchomeronimide were also prepared and their spectra recorded.