Iridium‐Catalysed Reductive Deoxygenation of Ketones with Formic Acid as Traceless Hydride Donor
作者:Zhiheng Yang、Xueya Zhu、Shiyi Yang、Weiyan Cheng、Xiaojian Zhang、Zhanhui Yang
DOI:10.1002/adsc.202000821
日期:2020.12.8
An iridium‐catalysed deoxygenation of ketones and aldehydes is achieved, with formic acid as hydride donor and water as co‐solvent. At low catalyst loading, a number of 4‐(N,N‐disubstituted amino) arylketones are readily deoxygenated in excellent yields and chemoselectivity. Numerous functional groups, especially phenolic and alcoholic hydroxyls, secondary amine, carboxylic acid, and alkyl chloride
以甲酸为氢化物供体,水为助溶剂,实现了铱催化的酮和醛的脱氧。在低催化剂负载下,许多4-(N,N-二取代氨基)芳基酮易于脱氧,具有出色的收率和化学选择性。许多官能团,尤其是酚羟基和醇羟基,仲胺,羧酸和烷基氯,都具有良好的耐受性。当使用DCO 2 D和D 2 O代替它们的氢化对应物时,可获得双歧化的双链烷烃达90%。激活4‐(N,N已证明二取代氨基)芳基会经历各种有用的转化。脱氧氘已用于制备氘代药物分子Chlorambucil-4,4- d 2。
Cation−π Interactions in the Benzylic Arylation of Toluenes with Bimetallic Catalysts
作者:Sheng-Chun Sha、Sergei Tcyrulnikov、Minyan Li、Bowen Hu、Yue Fu、Marisa C. Kozlowski、Patrick J. Walsh
DOI:10.1021/jacs.8b05143
日期:2018.10.3
A method to directly arylate toluene derivatives with aryl bromides to generate diarylmethanes, which are important building blocks in drug discovery, is described. In this method, KN(SiMe3)2 in combination with a (NIXANTPHOS)Pd catalyst accomplished the deprotonative activation of toluene derivatives to permit cross-coupling with aryl bromides. Good to excellent yields are obtained with a range of
Direct Arylation/Alkylation/Magnesiation of Benzyl Alcohols in the Presence of Grignard Reagents via Ni-, Fe-, or Co-Catalyzed sp<sup>3</sup> C–O Bond Activation
作者:Da-Gang Yu、Xin Wang、Ru-Yi Zhu、Shuang Luo、Xiao-Bo Zhang、Bi-Qin Wang、Lei Wang、Zhang-Jie Shi
DOI:10.1021/ja307045r
日期:2012.9.12
Direct application of benzyl alcohols (or their magnesium salts) as electrophiles in various reactions with Grignardreagents has been developed via transition metal-catalyzed sp(3) C-O bond activation. Ni complex was found to be an efficient catalyst for the first direct cross coupling of benzyl alcohols with aryl/alkyl Grignardreagents, while Fe, Co, or Ni catalysts could promote the unprecedented
已经通过过渡金属催化的 sp(3) CO 键活化开发了苯甲醇(或其镁盐)在与格氏试剂的各种反应中作为亲电试剂的直接应用。发现 Ni 配合物是苯甲醇与芳基/烷基格氏试剂首次直接交叉偶联的有效催化剂,而 Fe、Co 或 Ni 催化剂可以促进苯甲醇在( n) 己基MgCl。这些方法提供了将苯甲醇转化为各种功能的直接途径。
Iodine-Catalyzed Borylation of Benzylic Alcohols
作者:Chunyu Yin、Lu Luo、Hua Zhang
DOI:10.1021/acs.orglett.3c00367
日期:2023.3.17
Direct borylation of benzylic alcohols has been achieved via an iodine-catalyzed process. This transition-metal-free borylation transformation is compatible with various functional groups and provides a practical and convenient method to access important and useful benzylic boronate esters from widely available benzylic alcohols. Preliminary mechanistic investigations indicated that benzylic iodide
1,3-Dicyclohexylimidazol-2-ylidene as a Superior Ligand for the Nickel-Catalyzed Cross-Couplings of Aryl and Benzyl Methyl Ethers with Organoboron Reagents
A new catalytic system has been developed involving the use of Ni(cod)2 in conjunction with 1,3-dicyclohexylimidazol-2-ylidene for the cross-coupling of aryl and benzyl methyl ethers with organoboron reagents. This method not only allows for the use of readily available methyl ethers as halide surrogates but also provides a functional group tolerant method for the late-stage derivatization of complex molecules.