β-Dicéto énamines hétérocycliques: 2. (Pyridyl-4)-2 indanediones-1,3 C-et N-substituées

The authors have studies the regulation of the position of substitution in 2-(4-pyridy)-1-,3-indandiones and the precise methods for introducing functionalised substitutents on teh dihydropyridine nitrogen. These N-substituted compounds can also be synthetised by (a) condensation of momo- or polymethlated pyridines on dialkyl and monoalkyl phthalates and (b) by the oxidative condensation of Nalkylpyridinium btomides on 1,3-indandione. The negative solvatochromy observed in the electronic spectra of the N-substituted 2-(1,4-dihydrp-4-pyridylidèene)-1,3-indandiones leads us to propose a betaïne structure for these compounds.