An efficient protocol for the one-pot multicomponent synthesis of polysubstituted pyridines by using a biopolymer-based magnetic nanocomposite
作者:Ali Maleki、Abbas Ali Jafari、Somayeh Yousefi、Vahid Eskandarpour
DOI:10.1016/j.crci.2015.09.002
日期:2015.12
Résumé A biopolymer cellulose-based magnetic composite nanocatalyst was prepared and characterized by using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). Then, it was used efficiently in the multicomponent synthesis of polysubstituted pyridines under mild reaction conditions and using an easy work-up procedure at room temperature in ethanol. The nanocatalyst can be recovered easily and reused several times without significant loss of catalytic activity. Supplementary Materials: Supplementary materials for this article are supplied as separate files: mmc1.doc mmc2.zip mmc3.doc mmc4.doc
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
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
Silver(<scp>i</scp>)–N-heterocyclic carbene catalyzed multicomponent reactions: a facile synthesis of multisubstituted pyridines
作者:Shravankumar Kankala、Ramakanth Pagadala、Suresh Maddila、Chandra Sekhar Vasam、Sreekantha B. Jonnalagadda
DOI:10.1039/c5ra16582b
日期:——
A room temperature four component reaction between aromatic aldehydes, CH2(CN)2and NH4OAc with ketones mediated by Ag(i)–NHC pre-catalysts to produce multisubstituted pyridines in a short reaction time in eco-friendly ethanol was described.
A novel inorganic–organic nanohybrid material SBA-15@triazine/H5PW10V2O40 as efficient catalyst for the one-pot multicomponent synthesis of multisubstituted pyridines
inorganic–organic nanohybrid material SBA-15@triazine/H5PW10V2O40 (SBA-15@ADMPT/H5PW10V2O40) was prepared and used as an efficient, eco-friendly, and highly recyclable catalyst for the one-potmulticomponentsynthesis of multisubstituted pyridines from the reaction of aldehydes, cyclic ketones, malononitrile, and ammonium acetate with good to excellent yields (77–97%). The nanohybrid catalyst was prepared by the chemical
一种新颖的无机-有机纳米杂化材料SBA-15 @三嗪/ H 5 PW 10 V 2 ö 40(SBA-15 @ ADMPT / H 5 PW 10 V 2 ö 40)制备并用作有效的,环境友好的,并一种高度可回收的催化剂,用于醛,环酮,丙二腈和乙酸铵的反应,可一锅多组分合成多取代的吡啶,产率好至极好(77-97%)。通过Keggin杂多酸H 5 PW 10 V 2 O 40的化学锚固来制备纳米杂化催化剂。用2-APTS -4,6-双(3,5-二甲基-1H-吡唑-1-基)-1,3,5-三嗪(ADMPT)接头修饰的SBA-15中孔二氧化硅表面上。FT-IR,XRD,SEM,TEM,BET,EDX和DTA-TGA光谱等标准表征数据证实杂多酸H 5 PW 10 V 2 O 40在固定在用ADMPT改性的SBA-15中孔二氧化硅上之后,其完全分散在固体载体的表面上并且保留了其结构。此外,纳米催化剂可