... 2,3-c]pyrido[2,3-e][l,4]oxazines 6 Jean Gauthier* [1] and Jean Simon Duceppe 1081 Department of Chemistry, Ayerst Research ... Heterocyclic Chem., 21, 1081 (1984). ... 1086 J. Gauthier and JS Duceppe Vol.21 2-[l-Pyrrolidinyl)carbonyl]-4ff-imidazo[2,3-c]pyrido[2,3-e][l,4]oxazine-l ...