 The broad scope of the Kröhnke pyridine synthesis has made it particularly useful for the synthesis of poly aryl systems including pyridyl, thienyl, and furanyl moieties as well.The method tolerates a broad array of aryl substitiuents on both the α-pyridinium methyl ketone fragment and the α, β-unsaturated carbonyl compounds and can thus be used to generate a wide catalog of poly-aryl systems.Additionally, electron-withdrawing groups and electron-donating groups on the incoming aryl substituents are both well tolerated.