Multicomponent Domino Cyclization-Oxidative
Aromatization on a Bifunctional Pd/C/K-10
Catalyst: An Environmentally Benign Approach toward the
Synthesis of Pyridines
Facile Aromatisation of Hantzsch 1,4-Dihydropyridines by Autoxidation in the Presence of <i>P</i>-toluenesulfonic Acid in Acetic Acid
作者:Ding Zhang、Min Sha
DOI:10.3184/174751918x15208600846791
日期:2018.3
A simple protocol to achieve the aromatisation of Hantzsch dihydropyridines in high yield was established using p-toluenesulfonic acid in acetic acid and yields of 90% were obtained at room temperature. With regards to the Hantzsch1,4-dihydropyridines derived from alkyl aldehydes bearing one or more á-hydrogens, dealkylation products were obtained through a proposed autoxidation mechanism.
Multicomponent Domino Cyclization-Oxidative
Aromatization on a Bifunctional Pd/C/K-10
Catalyst: An Environmentally Benign Approach toward the
Synthesis of Pyridines
作者:Béla Török、Omar De Paolis、Jonathan Baffoe、Shainaz Landge
DOI:10.1055/s-0028-1083177
日期:——
A one-pot synthesis of substituted pyridines via a domino cyclization-oxidative aromatization (dehydrogenation) approach is described. The process is based on the use of a new bifunctional noble metal-solid acid catalyst, Pd/C/K-10 montmorillonite and microwave irradiation. The cyclization readily takes place on the strong solid acid while palladium dehydrogenates the dihydropyridine intermediates to the desired products.