Sm. Al-mousawi et al., Alkylazinylcarbonitriles as building blocks in heterocyclic synthesis: a route for the synthesis of 4-methyl-2-oxopyridines, PHARMAZIE, 54(8), 1999, pp. 571-574
The reaction of 1 with active methylene reagents afforded the enaminoamides
2 which readily cyclised to the pyridones 5. Compound 5 condensed with DMF
DMA to afford the dimethylamino pyridones 8. These coupled with aryldiazoni
um chloride to give hydrazonoals 10. Compound 2 coupled with aromatic diazo
nium salts to yield the arylazopyridines 4.