<i>N</i>-Heterocyclic carbene (NHC) catalyzed amidation of aldehydes with amines <i>via</i> the tandem <i>N</i>-hydroxysuccinimide ester formation
作者:Ashmita Singh、A. K. Narula
DOI:10.1039/d1nj00591j
日期:——
A facile method for the amidation of aldehydes by a cascade approach was developed. This methodology, reported for the first time, uses a N-heterocycliccarbene (NHC) as the catalyst, and N-hydroxysuccinimide (NHS) mediated synthesis of amides utilising TBHP as the oxidant. Various substituted aldehydes reacted smoothly with NHS giving the corresponding active esters in moderate to good yields, which
A Palladium-Catalyzed Carbonylation Approach to Acid Chloride Synthesis
作者:Jeffrey S. Quesnel、Bruce A. Arndtsen
DOI:10.1021/ja4098093
日期:2013.11.13
We describe a new approach to acid chloride synthesis via the palladium-catalyzed carbonylation of aryl iodides. The combination of sterically encumbered phosphines ((PBu3)-Bu-t) and CO coordination has been found to facilitate the rapid carbonylation of aryl iodides into acid chlorides via reductive elimination from ((Bu3P)-Bu-t)(CO)Pd(COAr)Cl. The formation of acid chlorides can also be exploited to perform traditional aminocarbonylation reactions under exceptionally mild conditions (ambient temperature and pressure), and with a range of weakly nucleophilic substrates.
A General Method for Two-Step Transamidation of Secondary Amides Using Commercially Available, Air- and Moisture-Stable Palladium/NHC (<i>N</i>-Heterocyclic Carbene) Complexes
作者:Guangrong Meng、Peng Lei、Michal Szostak
DOI:10.1021/acs.orglett.7b00796
日期:2017.4.21
The first general method is reported for transamidation of secondary carboxamides catalyzed by Pd-NHC (NHC = N-heterocyclic carbene) complexes. Commercially available, air- and moisture-stable (NHC)Pd(R-allyl)Cl complexes can effect C–N cross-coupling of a wide range of N-Boc and N-Ts amides, obtained by selective amide N-functionalization, with non-nucleophilic anilines and sterically hindered amines