Alkylation of ethyl 2-(4-oxo-1,4-dihydroquinolin-2-yl)acetate by Michael addition with various alkenes has been carried out. The C-alpha alkylated intermediates so formed can be cyclized with hot polyphosphoric acid to acridine-1,9-diones.
Alkylation of ethyl 2-(4-oxo-1,4-dihydroquinolin-2-yl)acetate by Michael addition with various alkenes has been carried out. The C-alpha alkylated intermediates so formed can be cyclized with hot polyphosphoric acid to acridine-1,9-diones.
Fused quinolizines have been formed from ethyl 2-(1,4-dihydro-4-oxoquinolin-2-yl)acetate by (a) Michael addition reactions of the sodium salt with alkynes (cyclization onto N occurs without isolation of the intermediate) and (b) Knoevenagel reaction with aryl aldehydes and thermal cyclization of the intermediates.