Zirconium-hydride-catalyzed site-selective hydroboration of amides for the synthesis of amines: Mechanism, scope, and application
作者:Bo Han、Jiong Zhang、Haijun Jiao、Lipeng Wu
DOI:10.1016/s1872-2067(21)63853-6
日期:2021.11
diverse amines. Various readily reducible functional groups, such as esters, alkynes, and alkenes, were well tolerated. Furthermore, the methodology was extended to the synthesis of bio- and drug-derived amines. Detailed mechanistic studies revealed a reaction pathway entailing aldehyde and amido complex formation via an unusual C–N bond cleavage-reformation process, followed by C–O bondcleavage.
Sulfated tungstate: a highly efficient catalyst for transamidation of carboxamides with amines
作者:Sagar P. Pathare、Ashish Kumar H. Jain、Krishnacharya G. Akamanchi
DOI:10.1039/c3ra00127j
日期:——
An environmentally benign protocol for the transamidation of carboxamides with amines using sulfated tungstate, as a heterogeneous catalyst, has been developed. The method has been successfully applied to the synthesis of a wide range of aromatic and aliphatic amides and phthalimides. Efficient transformation, mild reaction conditions, easy product isolation and the potential reusability of the catalyst
The use of BrCCl3-PPh3 in Appel type transformations to esters, O-acyloximes, amides, and acid anhydrides
作者:Mariam Al-Azani、Mazen al-Sulaibi、Nuha al Soom、Yosef Al Jasem、Bernhard Bugenhagen、Bassam Al Hindawi、Thies Thiemann
DOI:10.1016/j.crci.2016.04.004
日期:2016.8
Abstract Esters, acyloximes, amides and acid anhydrides have been prepared from the respective carboxylic acids, oximes, amines and alcohols by the use of the reagent combination BrCCl3-PPh3. The reactions obviate the handling acyl halides or more aggressive reagents PCl3, POCl3, or SOCl2. Furthermore, the environmentally hazardous CCl4 used in Appel-type reactions is replaced with BrCCl3, a reagent
Chemical‐Reductant‐Free Electrochemical Deuteration Reaction using Deuterium Oxide
作者:Xu Liu、Ruoyu Liu、Jiaxing Qiu、Xu Cheng、Guigen Li
DOI:10.1002/anie.202005765
日期:2020.8.10
We report a method for the electrochemical deuteration of α,β‐unsaturated carbonyl compounds under catalyst‐ and external‐reductant‐free conditions, with deuteration rates as high as 99 % and yields up to 91 % in 2 h. The use of graphite felt for both the cathode and the anode was key to ensuring chemoselectivity and high deuterium incorporation under neutral conditions without the need for an external
HAPpy catalysts: Hydroxyapatite‐supported gold nanoparticles efficiently catalyze the deoxygenation of amides, sulfoxides, and pyridine N‐oxides, with silanes as reductants, to give the corresponding products with excellent turnover numbers (see graphic). Furthermore, this catalyst is easily recovered and reused without any loss of efficiency.