Biphenyl-2-ols undergo regioselectivemono- and diarylation upon a treatment with aryl iodides in the presence of a palladium catalyst in DMF using Cs2CO3 as a base to produce 1,1′ : 2′,1″-terphenyl-2-ol and 2′,6′-diphenylbiphenyl-2-ol and their derivatives. The reaction of 1-naphthol selectively occurs at its 8-position to give 8-aryl-1-naphthols. In the reaction of 2-naphthol with aryl bromides, diarylated
Exhaustive Reduction of Esters Enabled by Nickel Catalysis
作者:Adam Cook、Sekar Prakash、Yan-Long Zheng、Stephen G. Newman
DOI:10.1021/jacs.0c02405
日期:2020.5.6
tolyl-derivatives. This is achieved by an organosilane-mediated ester hydrosilylation reaction and subsequent Ni/NHC catalyzed hydrogenolysis. The resulting conditions provide a direct and efficient alternative to multi-step procedures for this transformation that often require use of hazardous metal hydrides. Applications in the synthesis of -CD3 containing products, derivatization of bioactive molecules, and chemoselective
我们报告了将未活化的芳基酯直接还原为其相应的甲苯基衍生物的一步程序。这是通过有机硅烷介导的酯氢化硅烷化反应和随后的 Ni/NHC 催化氢解来实现的。由此产生的条件为通常需要使用危险金属氢化物的这种转化的多步骤程序提供了一种直接有效的替代方法。展示了在合成含 -CD3 的产品、生物活性分子的衍生化以及在其他 CO 键存在下进行化学选择性还原中的应用。
Nickel-catalyzed cyanation of phenol derivatives activated by 2,4,6-trichloro-1,3,5-triazine
作者:Liang Wang、Yaoyao Wang、Jun Shen、Qun Chen、Ming-Yang He
DOI:10.1039/c8ob01034j
日期:——
A nickel-catalyzed cyanation of phenolderivatives activated by 2,4,6-trichloro-1,3,5-triazine (TCT) using aminoacetonitrile as the cyanating agent is described. This catalytic system delivered the desired products in moderate to good yields with good substrate compatibility. The readily available starting materials, cost-effective nickel catalyst and metal-free cyanating agent are the major features
Palladium nanoparticles in an ionic liquid prepared readily by sputter deposition efficiently catalyze the Suzuki–Miyaura coupling of hydrophobic as well as hydrophilic aryl halides in water.