title: Investigations on the synthesis and properties of N-phenyl derivatives of 1,4-dioxo(1,4,5-trioxo)-1,2,3,4-tetra(1,2,3,4,5,6-hexa) hydropyrido-[3,4-d]pyridazines and allied compounds.
abstract: 2-(1-Piperidino)- and 2-(4-methyl-1-piperazinyl)-6-methyl-3,4-pyridinedicarboximides (1, 2) react with N-phenylhydrazine yielding N-phenylamino-3,4-pyridinedicarboximides (7, 8). The same reaction with 1,6-dimethyl-2-oxo-1,2-dihydro- and 2-chloro-6-methyl-3,4-pyridinedicarboximides (3, 17) gives the salts of the corresponding N-phenylpyridopyridazines with phenylhydrazine (13, 18), which transform into N-phenylaminoimides (14, 19) during boiling in 80% acetic acid. Compounds 7, 8 and 14 isomerize to the corresponding 2-phenyl-1,4-dioxo(1,4,5-trioxo)-1,2,3,4-tetra(1,2,3,4,5,6-hexa) hydropyrido[3,4-d]pyridazines (9, 10, 15) under the influence of heating in alcoholic solution of C2H5ONa or CH3ONa. Only in the case of imide 19 are 2- and 3-phenyl isomers (20 and 21) formed under these conditions. Some of the obtained compounds were pharmacologically active.
authors.affiliation: Department of Chemistry of Drugs, Wrocław University of Medicine, Poland.
authors.forename: H
authors.initials: H
authors.lastname: Sladowska
authors.forename: J
authors.initials: J
authors.lastname: Potoczek
authors.forename: M
authors.initials: M
authors.lastname: Sokołowska
authors.forename: G
authors.initials: G
authors.lastname: Rajtar
authors.forename: M
authors.initials: M
authors.lastname: Sieklucka-Dziuba
authors.forename: T
authors.initials: T
authors.lastname: Kocki
authors.forename: Z
authors.initials: Z
authors.lastname: Kleinrok
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000138:chemical synthesis / Q000737:chemistry; D005260:Female; D007274:Injections, Intraperitoneal; D007928:Lethal Dose 50; D008297:Male; D051379:Mice; D015394:Molecular Structure; D009043:Motor Activity / Q000187:drug effects; D011724:Pyridazines / Q000138:chemical synthesis* / Q000737:chemistry* / Q000494:pharmacology / Q000633:toxicity; D051381:Rats; D017208:Rats, Wistar; D013329:Structure-Activity Relationship
chemical_list: D000890:Anti-Infective Agents; D011724:Pyridazines