Electro-organic reactions part 35. Efficient carbon—oxygen bond formation in the anodic coupling of pyridopyrimidine derivatives.
作者:Mustafa Gullu、Liaquat A. Razack、James H.P. Utley、Ronald J. King、G.Ray White
DOI:10.1016/s0040-4020(01)87057-5
日期:1991.1
4-H-Pyrido[1,2-a]pyrimidine-2,4-diones (Chichibabin) derivatives, formed by condensation of 2-aminopyridines with substituted dialkylmalonates, are electroactive. In solution in CH2Cl2/CF3CO2H mixtures they are smoothly and selectively anodically coupled in high yield. The products are novel and unexpected; radical coupling at the C-3 and O-4 positions is involved and the proposed mechanism is analogous to that of oxidative phenolic coupling.
Buu-Hoi; Declercq, Recueil des Travaux Chimiques des Pays-Bas, 1954, vol. 73, p. 376,380