n of alkenes with anilines has been developed for the atom-economical synthesis of 2-substituted propanamides bearing an α-stereocenter. A novel phosphoramidite ligand L16 was discovered which exhibited very high reactivity and selectivity in the reaction. This asymmetric Markovnikov hydroaminocarbonylation employs readily available starting materials and tolerates a wide range of functional groups
Reaction of azides and enolisable aldehydes under the catalysis of organic bases and Cinchona based quaternary ammonium salts
作者:Dario Destro、Sandra Sanchez、Mauro Cortigiani、Mauro F. A. Adamo
DOI:10.1039/c7ob00799j
日期:——
preparation of amides starting from azides and enolisable aldehydes. The reaction proceeded via the formation of triazoline intermediates that were converted into amides via Lewis acid catalysis. Preliminary studies on the preparation of triazolines under chiral phasetransfercatalysis are also presented, demonstrating that enantioenriched amides could be prepared from achiral aldehydes in moderate to low
<i>N</i>,<i>N</i>-Diethylurea-Catalyzed Amidation between Electron-Deficient Aryl Azides and Phenylacetaldehydes
作者:Sheng Xie、Olof Ramström、Mingdi Yan
DOI:10.1021/ol503655a
日期:2015.2.6
Experimental data support 1,3-dipolarcycloaddition between DEU-activated enols and electrophilic phenyl azides, especially perfluoroaryl azides, followed by rearrangement of the triazolineintermediate. The activation of the aldehyde under near-neutral conditions was of special importance in inhibiting dehydration/aromatization of the triazolineintermediate, thus promoting the rearrangement to form aryl amides
Acid-free regioselective aminocarbonylation of alkenes
作者:Huizhen Liu、Ning Yan、Paul J. Dyson
DOI:10.1039/c4cc02167c
日期:——
An efficient method for the synthesis of N-aryl monosubstituted carboxamides via the Pd-catalyzed carbonylation of alkenes with CO and amines is described.