An efficient biomaterial supported bifunctional organocatalyst (ES-SO3− C5H5NH+) for the synthesis of β-amino carbonyls
作者:Sanny Verma、Suman L. Jain、Bir Sain
DOI:10.1039/c0ob00965b
日期:——
A biomaterial supported organocatalyst, readily synthesized by the reaction of chemically modified sulfonic group containing expanded corn starch with pyridine exhibited excellent catalytic activity for the synthesis of β-amino carbonyls in excellent yields via aza-Michael addition of amines to electron deficient alkenes. A remarkable enhancement in the reaction rates was observed with the prepared bifunctional organocatalyst in comparison to the either starch grafted sulfonic acid or the corresponding homogeneous pyridinium p-toluenesulfonate.
Aza-Michael Addition of Amines to <font>α</font>,<font>β</font>-Unsaturated Compounds Using Molecular Iodine as Catalyst
作者:Kalyan Jyoti Borah、Mridula Phukan、Ruli Borah
DOI:10.1080/00397910903320241
日期:2010.8.31
Aza-Michael adducts are obtained in very good yields by the conjugate addition of aliphatic amines to α,β-unsaturated compounds using molecular iodine as catalyst in dichloromethane at room temperature. Aromatic amines were found to be reactive under reflux in toluene.
The electrochemical fluorination of N-containing carboxylic acids (Part 4). Fluorination of methyl 3-dialkylamino-isobutyrates and methyl 3-dialkylamino-n-butyrates
作者:Takashi Abe、Haruhiko Fukaya、Eiji Hayashi、Yoshio Hayakawa、Masakazu Nishida、Hajime Baba
DOI:10.1016/0022-1139(93)03019-i
日期:1994.2
Several methylesters of 3-dialkylamino-substituted n- and isobutyric acids have been subjected to electrochemical fluorination to give the corresponding perfluoroacid fluorides. Dimethyl, diethyl, pyrrolidino, morpholino, piperidino and N-methylpiperazino groups were investigated as dialkylamino substituents. The structure/yield relationship was evaluated both in terms of the structure of the acid and
very simple conjugate addition of aromatic and aliphatic amines to α,β-unsaturated carbonyl compounds under solvent-free conditions in the presence of catalytic amount of silicontetrachloride is reported. The reaction of aryl and alkyl amines with different Michael acceptors gave the corresponding Michael adducts with simple catalyst and good to excellent yields.
ZrOCl2·8H2O on montmorillonite K10 accelerated conjugate addition of amines to α,β-unsaturated alkenes under solvent-free conditions
作者:Mohammed M. Hashemi、Bagher Eftekhari-Sis、Amir Abdollahifar、Behzad Khalili
DOI:10.1016/j.tet.2005.10.006
日期:2006.1
At roomtemperature, ZrOCl2·8H2O on montmorillonite K10 efficiently catalyzes conjugate addition of amines to a variety of conjugated alkenes such as α,β-unsaturated carbonyl compounds, carboxylic esters, nitriles and amides undersolvent-freeconditions. The catalyst can be recycled for subsequent reactions without any appreciable loss of efficiency.