Amination of Heteroaryl Chlorides: Palladium Catalysis or S<sub>N</sub>Ar in Green Solvents?
作者:Katie Walsh、Helen F. Sneddon、Christopher J. Moody
DOI:10.1002/cssc.201300239
日期:2013.8
reaction of heteroarylchlorides in the pyrimidine, pyrazine and quinazoline series with amines in water in the presence of KF results in a facile SNAr reaction and N‐arylation. The reaction is less satisfactory with pyridines unless an additional electron‐withdrawing group is present. The results showed that the transition‐metal‐free SNAr reaction not only compares favourably to palladium‐catalysed
嘧啶、吡嗪和喹唑啉系列中的杂芳基氯化物与水中的胺在 KF 存在下发生反应,导致容易的 S N Ar 反应和N芳基化。除非存在额外的吸电子基团,否则吡啶的反应不太令人满意。结果表明,无过渡金属的 S N Ar 反应不仅优于钯催化的偶联反应,而且在碱和溶剂方面也可以在环境可接受的(“绿色”)条件下进行。
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。
Nickel-Catalyzed Amination of Aryl Chlorides and Sulfamates in 2-Methyl-THF
作者:Noah F. Fine Nathel、Junyong Kim、Liana Hie、Xingyu Jiang、Neil K. Garg
DOI:10.1021/cs501045v
日期:2014.9.5
The nickel-catalyzedamination of aryl O-sulfamates and chlorides using the green solvent 2-methyl-THF is reported. This methodology employs the commercially available and air-stable precatalyst NiCl2(DME), is broad in scope, and provides access to aryl amines in synthetically useful yields. The utility of this methodology is underscored by examples of gram-scale couplings conducted with catalyst loadings
Nickel-catalyzed cross-coupling of aryltrimethylammonium triflates and amines
作者:Xue-Qi Zhang、Zhong-Xia Wang
DOI:10.1039/c3ob41989d
日期:——
Nickel-catalyzed cross-coupling of aryltrimethylammonium triflates and amines was carried out under mild conditions. The reaction has a broad scope of substrates and can be performed by a one-pot procedure from an aryldimethylamine.
Nickel-Catalyzed Amination of Aryl Pivalates by the Cleavage of Aryl CO Bonds
作者:Toshiaki Shimasaki、Mamoru Tobisu、Naoto Chatani
DOI:10.1002/anie.200907287
日期:2010.4.6
Catalytic amination: The title reaction demonstrates the use of aryl carboxylates as suitable electrophilic coupling substrates in catalytic amination reactions. N‐heterocyclic carbene ligands and NaOtBu promote the amination of aryl pivalates through the cleavage of normally unreactive aryl carbon–oxygen bonds (see scheme; cod=cyclooctadiene).
催化胺化:标题反应表明在催化胺化反应中使用芳基羧酸盐作为合适的亲电子偶联底物。N-杂环卡宾配体和NaO t Bu通过裂解通常不活泼的芳基碳氧键来促进新戊酸芳基的胺化(参见方案; cod =环辛二烯)。