173605-15-7Relevant academic research and scientific papers
Alkyl(oxo)pyridazinecarbonitriles as Bnilding Blocks in Heterocyclic Synthesis: Novel Syntheses of Pyridopyridazines, Pyridopyridazines, Thiopyranopyridazines and 1,3,4-thiadiazaacenaphthylenes
Abu-Shanab, Fathi A.,Wakefield, Basil,Al-Omran, Fatima,Khalek, Mervat M. Abdel,Elnagdi, Mohamed Hilmy
, p. 2924 - 2946 (2007/10/03)
The pyridopyridazines 4a-k were obtained via condensing the pyridazinones 1a,b with dimethylformamide dimethyl acetal and subsequent treatment of the formed dimethylaminoethylene derivatives (2a-c) with ammonia, amines and hydrazines.Compound 4a is also formed from the reaction of 1d with HOAc/HCl (cf.Scheme 1).In contrast 2a-c afforded the pyridopyridazine-1-carboxylic acid 6a-c on treatment with HOAc/HCl.The reaction of 1a with carbon disulfide followed by methyl iodide gives the thiopyranopyridazine 11.The reaction of the thienopyridazinone (13a) with dimethylacetylene dicarboxylate gives the phthalazine (16) as the sole product, whereas reaction of (13a) with diethyl fumarate gives the thiadiazaacenaphthylene (19).
STUDIES WITH POLYFUNCTIONALLY SUBSTITUTED HETEROAROMATICS: NEW ROUTES FOR SYNTHESIS OF BENZOAZINES
Negm, Abdalla M.,El-Aal, Fatma Abd El-Maksoud Abd,Hafez, Ebtisam A.,Elnagdi, Mohamed H.,Mostafa, Yasser M. N.
, p. 1 - 8 (2007/10/03)
Pyridazine (I) reacts with dimethyl acetylenedicarboxylate and with N-phenyl-maleimide yielding phthalazine (II) and pyrrolophthalazine (III), respectively.Pyridine IV reacts with benzylidene malononitrile to give compound VI.Compounds VIa-c could be successfully converted into the isoquinolines XIa-c on treatment with acrylonitrile.In contrast to the behavior of arylidene malononitrile, compound IV react with N-phenylmaleimide to yield the pyrroloisoquinoline XIII.Similarly, the reaction of compound IV with each of tetracyanoethylene and dimethyl acetylenecarboxylate gave compounds XIV and XV respectively.Key words: Phthalazine, pyrrolophthalazine, isoquinoline, pyrroloisoquinoline, pyridothienopyridine.
