Aerobic Oxidative Amidation of Aromatic and Cinnamic Aldehydes with Secondary Amines by CuI/2-Pyridonate Catalytic System
作者:Mingwen Zhu、Ken-ichi Fujita、Ryohei Yamaguchi
DOI:10.1021/jo301553v
日期:2012.10.19
A simple and convenient CuI/2-pyridonate catalytic system for the oxidative amidation of aldehydes with secondary amines has been developed. With this system, a variety of useful arylamides have been synthesized in moderate to good yields in the presence of small amount of copper catalyst and the pyridonate ligand, generating only water as a coproduct. Synthesis of cinnamamides was also achieved by
Decarboxylative Negishi Coupling of Redox‐Active Aliphatic Esters by Cobalt Catalysis
作者:Xu‐Ge Liu、Chu‐Jun Zhou、E. Lin、Xiang‐Lei Han、Shang‐Shi Zhang、Qingjiang Li、Honggen Wang
DOI:10.1002/anie.201806799
日期:2018.10
A cobalt‐catalyzed decarboxylative Negishi coupling reaction of redox‐active aliphatic esters with organozinc reagents was developed. The method enabled efficient alkyl–aryl, alkyl–alkenyl, and alkyl–alkynyl coupling reactions under mild reaction conditions with no external ligand or additive needed. The success of an in situ activation protocol and the facile synthesis of the drug molecule (±)‐preclamol
Copper-Catalyzed Aerobic Oxidative Amidation of Benzyl Alcohols
作者:Scott W. Krabbe、Vincent S. Chan、Thaddeus S. Franczyk、Shashank Shekhar、José G. Napolitano、Carmina A. Presto、Justin A. Simanis
DOI:10.1021/acs.joc.6b01686
日期:2016.11.18
A Cu-catalyzed synthesis of amides from alcohols and secondary amines using the oxygen in air as the terminal oxidant has been developed. The methodology is operationally simple requiring no high pressure equipment or handling of pure oxygen. The commercially available, nonprecious metal catalyst, Cu(phen)Cl2, in conjunction with di-tert-butyl hydrazine dicarboxylate and an inorganic base provides
利用空气中的氧气作为末端氧化剂,从醇和仲胺中Cu催化合成酰胺已得到发展。该方法操作简单,不需要高压设备或纯氧气的处理。可商购的非贵金属催化剂Cu(phen)Cl 2与二叔丁基肼二羧酸酯和无机碱一起以中等到极好的收率提供了多种苯甲酰胺。胺共轭酸的p K a和醇的电子学被证明会影响碱的选择,以实现最佳反应性。提出了一种与观察到的反应性趋势,KIE和Hammett研究相一致的机制。
Catalytic N‐Acylation of Cyclic Amines by Arylglyoxylic Acids via Radical‐Radical Cross‐Coupling
A unique copper‐based catalyst system allows for the N‐acylation of cyclic amines by arylglyoxylic acids via radical‐radical cross‐coupling strategy. As evidenced by EPR, UV‐Vis, and mass spectrometric analysis, the amide linkage formation proceeds through a Cu(I)/Cu(II) catalytic cycle involving a twofold SET process.
Copper-Manganese Spinel Oxide Catalyzed Synthesis of Amides and Azobenzenes via Aminyl Radical Cations
作者:Shaista Sultan、Manjeet Kumar、Shekaraiah Devari、Debaraj Mukherjee、Bhahwal Ali Shah
DOI:10.1002/cctc.201501218
日期:2016.2
A highly efficient Cu–Mn‐catalyzed process for the aminolysis of esters was developed. Also, the catalyst promoted the self‐ and cross‐dehydrogenativecoupling of anilines to generate symmetrical and unsymmetrical azobenzenes, respectively. The reactions were performed under neutral conditions with an inexpensive catalyst, gave high yields, and offered wide functional group tolerance.