Cobalt catalysed aminocarbonylation of thiols in batch and flow for the preparation of amides
作者:Jose Maria Orduña、Gema Domínguez、Javier Pérez-Castells
DOI:10.1039/d1ra04736a
日期:——
The synthesis of amides from thiols through a cobalt-catalyzed aminocarbonylation is shown. After optimizing all the reaction parameters, the methodology makes possible the obtention of amides with variable yields, while competing reactions such as the formation of disulfides and ureas can be limited. The process works well with aromatic thiols with electron donating groups (EDG) whereas other thiols
Nafion®-catalyzed microwave-assisted Ritter reaction: an atom-economic solvent-free synthesis of amides
作者:Vivek Polshettiwar、Rajender S. Varma
DOI:10.1016/j.tetlet.2008.02.009
日期:2008.4
An atom-economic solvent-free synthesis of amides by the Ritter reaction of alcohols and nitriles under microwaveirradiation is reported. This green protocol is catalyzed by solid-supported Nafion®NR50 with improved efficiency and reduced waste production.
The synthesis and structure of pyridine-oxadiazole iridium complexes and catalytic applications: Non-coordinating-anion-tuned selective C N bond formation
作者:Wei Yao、Yilin Zhang、Haiyan Zhu、Chenyang Ge、Dawei Wang
DOI:10.1016/j.cclet.2019.08.049
日期:2020.3
Abstract Several novel pyridine-oxadiazole iridium complexes were synthesized and characterized through X-ray crystallography. The designed iridium complexes revealed surprisingly high catalytic activity in CN bondformation of amides and benzyl alcohols with the assistance of non-coordinating anions. In an attempt to achieve borrowing hydrogen reactions of amides with benzyl alcohols, N,N'-(phenylmethylene)dibenzamide
photoelectron spectrometry (XPS), Fourier-transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD). The resulting copper/cobalt composites exhibited a much higher catalytic activity towards the borrowing hydrogen reactions of benzenesulfonamides with benzyl alcohols and carboxamides with alcohols than copper polymers. In addition, copper/cobalt composites could be easily recovered and reused
(MPV)-type reduction between benzonitriles and benzylic alcohols under transition-metal-free conditions has been demonstrated for the first time. Using simple KOt-Bu as the base, various benzonitriles can be efficiently reduced by benzylic alcohols via hydrogen transfer reduction, and the resultant phenyl imine can react further with benzylic alcohols to give amides as the final product in which both
Meerwein-Ponndorf-Verley (MPV) 型在无过渡金属条件下苯甲腈和苯甲醇之间的还原首次得到证实。以简单的 KO t -Bu 为碱,苯甲醇可以通过氢转移还原有效地还原各种苯甲腈,生成的苯亚胺可以与苯甲醇进一步反应得到酰胺作为最终产物,其中醇和腈均被纳入。初步机理研究表明,该反应可能经历多个 MPV 型氢转移过程。