Mh. Elnagdi et al., STUDIES ON POLYFUNCTIONALISED HETEROAROMATICS - A NOVEL SYNTHESIS OF POLYFUNCTIONALISED PYRIDINE, PYRIDAZINE AND PYRIDO[2,3-C]PYRIDAZINE DERIVATIVES, Journal of chemical research. Synopses, (1), 1998, pp. 26-27
Ethyl 2-arylhydrazono-3-oxobutyrates react with alpha,beta-unsaturated
nitriles to afford either pyridopyridazine or pyridine derivatives de
pending on the structure of the unsaturated nitrile.