Catalytic Transamidation Reactions Compatible with Tertiary Amide Metathesis under Ambient Conditions
作者:Nickeisha A. Stephenson、Jiang Zhu、Samuel H. Gellman、Shannon S. Stahl
DOI:10.1021/ja8094262
日期:2009.7.29
present study reveals that simple zirconium- and hafnium-amido complexes are highly efficient catalysts for equilibrium-controlled transamidation reactions between secondary amines and tertiary amides. In a number of cases, transamidation proceeds rapidly at room temperature. We find that these new catalysts are sufficiently active to promote the metathesis of tertiary amides, which arises from successive
Manganese/cobalt-catalyzed oxidative C(sp<sup>3</sup>)–H/C(sp<sup>3</sup>)–H coupling: a route to α-tertiary β-arylethylamines
作者:Meiling Tan、Kaizhi Li、Jiangliang Yin、Jingsong You
DOI:10.1039/c7cc08512e
日期:——
An oxidative coupling reaction of an α-C(sp3)–H bond of amine with a benzylic C(sp3)–H bond provides diverse collections of α-tertiary β-arylethylamines.
Lanthanum trifluoromethanesulfonate is an effective single-component catalyst for synthesizing a variety of amides directly from esters and amines under mild conditions. Highly selective amidation of esters and amines, as well as catalyst-controlled amidation of esters, demonstrated the effectiveness of the catalyst system.
Highly chemoselective, sterically sensitive NHC-catalysed amine acylation with pyridil
作者:Amy C. Maguire、Vikas Kumar、Stephen J. Connon
DOI:10.1039/c9cc06937b
日期:——
A new strategy for the protection of amines has been developed involving reaction with pyridil under the influence of N-heterocyclic carbene catalysis. The methodology is capable of distinguishing between two amines characterised by small differences in steric bulk and the resulting pyridoyl amides can be cleaved without requiring either strongly acidic or basic hydrolysis.
Solvent-Free Iron(III) Chloride-Catalyzed Direct Amidation of Esters
作者:Blessing D. Mkhonazi、Malibongwe Shandu、Ronewa Tshinavhe、Sandile B. Simelane、Paseka T. Moshapo
DOI:10.3390/molecules25051040
日期:——
work, we report the synthesis of these functional groups via an iron(iii) chloride-catalyzed direct amidation of esters. The reactions are conducted under solvent-free conditions and found to be compatible with a range of amine and ester substrates generating the desired amides in short reactiontimes and good to excellent yields at a catalyst loading of 15 mol%.