A Simple Method for the Preparation of 2-Amino-4-aryl-3-cyanopyridines by the Condensation of Malononitrile with Aromatic Aldehydes and Alkyl Ketones in the Presence of Ammonium Acetate
Nanomagnetically modified vitamin B
<sub>3</sub>
(Fe
<sub>3</sub>
O
<sub>4</sub>
@Niacin): An efficient and reusable green biocatalyst for microwave‐assisted rapid synthesis of 2‐amino‐3‐cyanopyridines in aqueous medium
Superparamagnetic nanoparticles of modified vitamin B3 (Fe3O4@Niacin) represent a new, efficient and green biocatalyst for the one‐pot synthesis of 2‐amino‐3‐cyanopyridine derivatives via four‐component condensation reaction between aldehydes, ketones, malononitrile, and ammonium acetate undermicrowaveirradiation in water. This new magnetic organocatalyst was easily isolated from the reaction mixture by
Poly N,N-dimethylaniline-formaldehyde supported on silica-coated magnetic nanoparticles: a novel and retrievable catalyst for green synthesis of 2-amino-3-cyanopyridines
作者:Sajad Asadbegi、Mohammad Ali Bodaghifard、Akbar Mobinikhaledi
DOI:10.1007/s11164-017-3200-4
日期:2020.3
Preparation and application of novel and reusable magneticnanoparticles with poly N,N-dimethylaniline-formaldehyde support as a heterogeneous basic catalyst have been described. The reported catalyst was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction patterns, transmission electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetric
Abstract A first example of environmentally benign zinc complex catalyzed one-pot four-component reaction between malononitrile, ketone, ammonium acetate and aromatic aldehyde for the facilesynthesis of fully substituted pyridines just within 2 min in environmentally friendly solvent ethanol has been optimized. GRAPHICAL ABSTRACT
Iodine‐promoted facile protocol is designed for the production of pyridines at room temperature under ultrasound irradiation. Eleven pyridine derivatives in excellent yields (91–97%) are synthesized with 2 hr reaction time. Additional advantage of the proposed ultrasound‐assisted eco‐friendly, cost‐effective protocol is easy separation of product, and our in silico studies show good binding affinity
An efficient and promising synthetic approach to assemble skeletons of multifunctionalized pyridine derivatives in presence of recyclableheterogeneoussulfated tin oxide (STO) catalyst has been evolved. The STO catalyst was used as a promoter for the cyclocondensation process in ethanol at 70°C. Overall performance of this catalyst was attributed to the cooperative contribution of its Lewis and Brønsted‐Lowry