Synthesis of substituted 5H-pyridazino[3, 4-b]-1, 4-benzoxazines (3,4-diazaph enoxazines)
A number of 2,10-substituted 3,4-diazaphenoxazines were obtained by the condensation of 2-chloro-3,4-diazaphenoxazine and its 10-substituted derivatives with cyclic amines.