Nitriles in heterocyclic synthesis: novel synsthesis of benzo[c]-coumarin and of benzo[c]pyrano[3,2-c]quinoline derivatives

Syntheses a partir de methyl-4 oxo-2 chromenecarbonitrile-3 ou de dihydro-5,6 dimethyl-4,6 dioxo-2,5 pyranno [3,2-c] quinoleinecarbonitrile-3, et d'α-cyano ou α-ethoxycarbonyl cinnamonitriles