E. Knaus, K. Avasthi, K. Redda
Jan 15, 1980
Citations
0
Influential Citations
4
Citations
Journal
Canadian Journal of Chemistry
Abstract
Reaction of pyridinecarboxaldehydes 1 with α-ethoxyvinyllithium 2 affords 2-ethoxy-1-(pyridinyl)-2-propen-1-ols 3 which on hydrolysis with aqueous formic acid give pyridinyl α-hydroxyketones 4. Selenium dioxide oxidation of 4a and 4b provides pyridinyl α-diketones 9 which on condensation with o-phenylenediamine afford 3-methyl-2-(pyridinyl) quinoxalines 11. Pyridinyl α-hydroxyketones 4a and 4b react with hydroxylamines to yield a mixture of E- and Z-oximes 5 and 6.