Palladium- and Nickel-Catalyzed Aminations of Aryl Imidazolylsulfonates and Sulfamates
作者:Lutz Ackermann、René Sandmann、Weifeng Song
DOI:10.1021/ol200267b
日期:2011.4.1
A nickel complex derived from dppf, along with NaOt-Bu as the base, allowed for challenging aminations of aryl sulfamates. An improved functional group tolerance is observed in novel palladium-catalyzed aminations of imidazolylsulfonates with rac-BINAP as the ligand.
衍生自dppf的镍络合物以及NaO t -Bu作为碱,可实现富挑战性的氨基磺酸氨基酯的胺化反应。以rac -BINAP为配体的新型钯催化的咪唑基磺酸盐胺化反应观察到官能团耐受性提高。
Nickel-Catalyzed Amination of Aryl Sulfamates and Carbamates Using an Air-Stable Precatalyst
作者:Liana Hie、Stephen D. Ramgren、Tehetena Mesganaw、Neil K. Garg
DOI:10.1021/ol301847m
日期:2012.8.17
A facile nickel-catalyzed method to achieve the amination of synthetically useful arylsulfamates and carbamates is reported. Contrary to most Ni-catalyzed amination reactions, this user-friendly approach relies on an air-stable Ni(II) precatalyst, which, when employed with a mild reducing agent, efficiently delivers aminated products in good to excellent yields. The scope of the method is broad with
报道了一种简便的镍催化方法来实现合成有用的氨基磺酸芳基酯和氨基甲酸酯的胺化。与大多数 Ni 催化的胺化反应相反,这种用户友好的方法依赖于空气稳定的 Ni(II) 预催化剂,当它与温和的还原剂一起使用时,可以有效地以良好到优异的产率提供胺化产物。该方法的范围就两个偶联伙伴而言都是广泛的,并且包括杂环底物。
An Efficient Suzuki-Miyaura Coupling of Aryl Sulfamates and Boronic Acids Catalyzed by NiCl2(dppp)
作者:Guo-Jun Chen、Fu-She Han
DOI:10.1002/ejoc.201200444
日期:2012.7
The SuzukiMiyaura cross-coupling of aryl sulfamates and boronicacids was investigated by using [1,3-bis(diphenylphosphanyl)propane]nickel(II) chloride NiCl2(dppp)} as the catalyst. The results showed that NiCl2(dppp) is a highly active and general catalyst that allows effective SuzukiMiyaura cross-coupling of aryl sulfamates with a slight excess amount of the boronicacid (1.2 equiv.) in the presence
Pincer-Nickel-Catalyzed Cross-Coupling of Aryl Sulfamates with Arylzinc Chlorides
作者:Jian-Long Tao、Zhong-Xia Wang
DOI:10.1002/ejoc.201500987
日期:2015.9
The nickel N,N,N-pincer complex 2 was demonstrated to effectively catalyze the cross-coupling of arylsulfamates with arylzincchlorides under mild conditions. The reaction is suitable for a wide range of substrates, and tolerates various functional groups.
Oxidative Addition of Aryl Electrophiles to a Prototypical Nickel(0) Complex: Mechanism and Structure/Reactivity Relationships
作者:Sonia Bajo、Gillian Laidlaw、Alan R. Kennedy、Stephen Sproules、David J. Nelson
DOI:10.1021/acs.organomet.7b00208
日期:2017.4.24
Detailed kinetic studies of the reaction of a model Ni0 complex with a range of aryl electrophiles have been conducted. The reactions proceed via a fast ligand exchange pre-equilibrium, followed by oxidativeaddition to produce either [NiIX(dppf)] (and biaryl) or [NiII(Ar)X(dppf)]; the ortho substituent of the aryl halide determines selectivity between these possibilities. A reactivity scale is presented
已经对模型 Ni0 络合物与一系列芳基亲电子试剂的反应进行了详细的动力学研究。反应通过快速配体交换预平衡进行,然后氧化加成生成 [NiIX(dppf)](和联芳基)或 [NiII(Ar)X(dppf)];芳基卤化物的邻位取代基决定了这些可能性之间的选择性。提出了一个反应性等级,其中一系列底物按照它们经历氧化添加的速率进行定量排序。氧化加成速率与原型交叉偶联反应中的转化率松散相关。在动力学实验中导致 NiI 产物的底物在催化条件下会产生更多的同源偶联产物。