Collect. Czech. Chem. Commun. 1989, 54, 2721-2730

Preparation and synthetic utilization of diarylmethylenemalonaldehydes

Vladimír Král, Ladislav Jelínek and David Šaman

Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6


A general synthetic approach to disubstituted methylenemalonaldehydes consisting in reaction of geminal dihalogeno derivatives with 1,3-bis(dimethylamino)trimethinium perchlorate is described. Solution of the prepared compounds has been determinated by NMR spectroscopy. The prepared compounds were utilized as suitable synthons of pyrazole (XII), 4H-1,2,6-oxadiazine (XIV) and diazepine (XV) derivatives.