作者:William I. Nicholson、Fabien Barreteau、Jamie A. Leitch、Riley Payne、Ian Priestley、Edouard Godineau、Claudio Battilocchio、Duncan L. Browne
DOI:10.1002/anie.202106412
日期:2021.9.27
The direct mechanochemical amidation of esters by ball milling is described. The operationally simple procedure requires an ester, an amine, and substoichiometric KOtBu and was used to prepare a large and diverse library of 78 amide structures with modest to excellent efficiency. Heteroaromatic and heterocyclic components are specifically shown to be amenable to this mechanochemical protocol. This
Dehydrogenative amide synthesis from alcohol and amine catalyzed by hydrotalcite-supported gold nanoparticles
作者:Jiangling Zhu、Yan Zhang、Feng Shi、Youquan Deng
DOI:10.1016/j.tetlet.2012.04.048
日期:2012.6
Hydrotalcite-supported nano-gold (Au/HT) was found to be a highly efficient heterogeneous catalyst for the dehydrogenative synthesis of amidefromalcohol and amine. Amines and alcohols with different structures could be converted into the amides under mild reaction conditions with up to 98% isolated yields. Mechanism exploration suggested that ester might be the reaction intermediate.
Base-Controlled Completely Selective Linear or Branched Rhodium(I)-Catalyzed C−H <i>ortho</i>
-Alkylation of Azines without Preactivation
作者:Gaël Tran、Kevin D. Hesp、Vincent Mascitti、Jonathan A. Ellman
DOI:10.1002/anie.201702409
日期:2017.5.15
A [RhI]/bisphosphine/base catalytic system for the ortho‐selectiveC−H alkylation of azines by acrylates and acrylamides is reported. This catalytic system features an unprecedented complete linear or branched selectivity that is solely dependent on the catalytic base that is used. Complete branched selectivity is even achieved for ethyl methacrylate, which enables the introduction of a quaternary
据报道,[Rh I ] /双膦/碱催化体系可通过丙烯酸酯和丙烯酰胺对嗪进行邻位选择性C H烷基化。该催化体系具有前所未有的完全线性或支化选择性,这完全取决于所使用的催化碱。甲基丙烯酸乙酯甚至可以实现完全支化的选择性,从而可以引入季碳中心。对于直链和支链烷基化都表现出优异的官能团相容性。这种转化的操作简便性和广泛范围使其可以快速获得具有直接制药和农用化学相关性的功能化杂志。
Manganese Catalyzed Direct Amidation of Esters with Amines
作者:Zhengqiang Fu、Xinghua Wang、Sheng Tao、Qingqing Bu、Donghui Wei、Ning Liu
DOI:10.1021/acs.joc.0c02478
日期:2021.2.5
metal catalyzed amidations remains a challenge. Here, a manganese(I)-catalyzed method for the direct synthesis of amides from a various number of esters and amines is reported with unprecedented substrate scope using a low catalyst loading. A wide range of aromatic, aliphatic, and heterocyclic esters, even in fattyacid esters, reacted with a diverse range of primary aryl amines, primary alkyl amines
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。