An efficient synthesis of 2-amino-4-aryl-3,5-dicarbonitrile-6-ethoxypyridine derivatives by the solvent taking part in the reaction
作者:Suhui Wang、Sheng Xia、Shimin Tao、Yunyun Zha、Youjian Feng、Liangce Rong
DOI:10.1007/s11164-012-0829-x
日期:2013.9
An efficient and facile synthesis of 2-amino-4-aryl-3,5-dicarbonitrile-6-ethoxypyridine via reaction of aromatic aldehydes, malononitrile, and ethanol in the presence of NaOH has been developed, without using the classic reagents amines and 1,3-dicarbonyl compounds. It is interesting that weak nucleophilic reagent ethanol could take part in the reaction without using strong base catalyst sodium ethylate. Compared with existing methods, the reported process has the advantages of excellent yields, easily obtainable raw materials, and mild reaction conditions.
Reusable Ce-V Loaded Alumina Catalyst for Multicomponent Synthesis of Substituted Pyridines in Green Media
作者:Suresh Maddila、Surya N. Maddila、Sreekantha B. Jonnalagadda、Palakondu Lavanya
DOI:10.1002/jhet.2430
日期:2016.3
as an effective heterogeneous catalyst is synthesized by a simple technique. The catalyst was identified by powder X‐ray diffraction, SEM, TEM, and BET surface area analysis. The catalyst is fully recyclable and reusable for several runs preserving its high activity. The catalytic activity of Ce‐V/Al2O3 is described by synthesis of a series of multisubstituted pyridines in good to excellent yields via