Synthesis of novel functionally substituted pyridazines and oxazines

Acetone 1,3-di(phenylhydrazone) reacts with arylidenemalononitriles in the presence of piperidine to give the coressponding 3,3′-carbonylbispyridazine derivatives. Under the same reaction conditions dioxime reacts with arylidenemalononitriles to give the corresponding 3,3′-carbonylbis-1,2-oxazines. Dioxime reacts with primary aromatic amines and formalin in a molar ratio of 1:1:2 to give 1-arylidene-3,5-dihydroxyimino-piperidine-4-ones. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1223–1229, August, 2008.