Cyclic hydrazides. 2. synthesis of substituted 4-hydroxy-1-oxo-1,2-dihydropyridazino[4,5-b]quinoline 5-oxides

Article abstract of DOI:10.1007/BF02315189

Reaction of N-oxides of dimethyl quinoline-2,3-dicarboxylates with hydrazine and subsequent oxidation with peracetic acid has given quinoline-2,3-dicarboxylic acid hydrazide 5-oxides, from which water soluble-quaternary ammonium salts can be prepared. 199