A Cross-Coupling Approach to Amide Bond Formation from Esters
作者:Taoufik Ben Halima、Jaya Kishore Vandavasi、Mohanad Shkoor、Stephen G. Newman
DOI:10.1021/acscatal.7b00245
日期:2017.3.3
A palladium-catalyzed cross-coupling between aryl esters and anilines is reported, enabling access to diverse amides. The reaction takes place via activation of the C–O bond by oxidative addition with a Pd–NHC complex, which enables the use of relatively non-nucleophilic anilines that otherwise require stoichiometric activation with strong bases in order to react. High yields of aromatic, aliphatic
Transition‐Metal‐Free DMAP‐Mediated Aromatic Esterification of Amides with Organoboronic Acids
作者:Tao Wang、Yanqing Wang、Kai Xu、Yuheng Zhang、Jiarui Guo、Lantao Liu
DOI:10.1002/ejoc.202100478
日期:2021.6.14
A new, transition-metal-free, effective method for aromatic esterification of amides with organoboronic acids has been developed, leading to a wide range of benzoate derivatives with yields ranging from moderate to good. The catalytic reaction shows broad substrate scope and excellent functional group tolerance.
N-heterocyclic carbene-catalyzed oxidation of aldehydes for the synthesis of amides via phenolic esters
作者:Miran Ji、Seungyeon Lim、Hye-Young Jang
DOI:10.1039/c4ra04012k
日期:——
N-heterocyclic carbene-catalyzedoxidationusingTEMPO is reported for the conversion of aldehydes to amides. A wide range of amides were synthesized in good yields (up to 72%) via a one-pot, sequential protocol involving oxidative esterification of aldehydes and subsequent aminolysis. To promote efficient aminolysis, various alkoxide leaving groups were evaluated.
Acylation of oxindoles using methyl/phenyl esters <i>via</i> the mixed Claisen condensation – an access to 3-alkylideneoxindoles
作者:Ramdas Sreedharan、Purushothaman Rajeshwaran、Pradeep Kumar Reddy Panyam、Saurabh Yadav、C. M. Nagaraja、Thirumanavelan Gandhi
DOI:10.1039/d0ob00789g
日期:——
Predominantly, aggressive acid chlorides and stoichiometric coupling reagents are employed in the acylating process for synthesizing carbonyl tethered heterocycles. Herein, we report simple acyl sources, viz. methyl and phenyl esters, which acylate oxindoles via the mixed Claisen condensation. This straightforward protocol is mediated by LiHMDS and KOtBu and successfully applied to a wide range of
Nickel-Catalyzed C−S Bond Formation via Decarbonylative Thioetherification of Esters, Amides and Intramolecular Recombination Fragment Coupling of Thioesters
A nickelcatalyzed cross‐coupling protocol for the straightforward C−Sbond formation has been developed. Various mercaptans and a wide range of ester and amide substrates bearing various substituents were tolerated in this process which afforded products in good to excellent yields. Furthermore, an intramolecular protocol for the synthesis of thioethers starting from thioesters has been developed