R2OOC. ^L XOOR2
The initial product of the condensation is a 1,4-dihydropyridine 19, which can be oxidized to the corresponding pyridine derivative 20 . Microwave-assisted combinatorial chemistry was recently applied to the high-throughput Hantzsch synthesis to create libraries of diverse substituted pyridines [21, 22]. The authors used a solvent-free approach in a 96-well plate format employing filter bottom plates. Bentonite clay was used as support and ammonium nitrate was applied as source of ammonia and oxidant , according to Scheme 13.
Was this article helpful?