Iron-Catalyzed Difluoromethylation of Arylzincs with Difluoromethyl 2-Pyridyl Sulfone
作者:Wenjun Miao、Yanchuan Zhao、Chuanfa Ni、Bing Gao、Wei Zhang、Jinbo Hu
DOI:10.1021/jacs.7b11976
日期:2018.1.24
We report the first iron-catalyzed difluoromethylation of arylzincs with difluoromethyl2-pyridylsulfone via selective C-S bond cleavage. This method employs the readily available, bench-stable fluoroalkyl sulfone reagent and inexpensive iron catalyst, allowing facile access to structurally diverse difluoromethylated arenes at low temperatures. The experiment employing a radical clock indicates the
Photocatalytic Decarboxylative Coupling of Aliphatic N‐hydroxyphthalimide Esters with Polyfluoroaryl Nucleophiles
作者:Xiangli Yi、Runze Mao、Lara Lavrencic、Xile Hu
DOI:10.1002/anie.202108465
日期:2021.10.25
of alkylated polyfluoroarenes remains challenging. Here we describe a decarboxylative coupling reaction of N-hydroxyphthalimide esters of aliphatic carboxylicacids with polyfluoroaryl zinc reagents (Zn-ArF) via synergetic photoredox and copper catalysis. This method readily converts primary and secondary alkyl carboxylicacids into the corresponding polyfluoroaryl compounds, which could have a wide
多氟芳烃是医学和材料化学中的一类重要化合物。烷基化多氟芳烃的合成仍然具有挑战性。在这里,我们描述了脂肪族羧酸的 N-羟基邻苯二甲酰亚胺酯与多氟芳基锌试剂 (Zn-Ar F ) 通过协同光氧化还原和铜催化进行的脱羧偶联反应。该方法很容易将伯烷基羧酸和仲烷基羧酸转化为相应的多氟芳基化合物,该化合物可以具有广泛的 F 含量 (2F-5F) 和芳基上可变的 F 取代模式。实现了广泛的范围和良好的官能团相容性,包括在天然产物和药物衍生的底物上。机理研究表明,[Cu-(Ar F ) 2 ]物种可能负责将多氟芳基转移至烷基自由基。
Iron catalysed Negishi cross-coupling using simple ethyl-monophosphines
作者:Caleb A. Brown、Terence A. Nile、Mary F. Mahon、Ruth L. Webster
DOI:10.1039/c5dt00112a
日期:——
Reported is a rare example of the use of monophosphines in iron catalysed Negishi cross-coupling. Substrate scope in terms of alkyl bromide and diaryl zinc reagent is explored.
Quaternary Centers by Nickel‐Catalyzed Cross‐Coupling of Tertiary Carboxylic Acids and (Hetero)Aryl Zinc Reagents
作者:Tie‐Gen Chen、Haolin Zhang、Pavel K. Mykhailiuk、Rohan R. Merchant、Courtney A. Smith、Tian Qin、Phil S. Baran
DOI:10.1002/anie.201814524
日期:2019.2.18
redox-active esters with aryl zinc reagents. Previously limited to primary, secondary, and specialized tertiary centers, a new protocol has been devised to enable the coupling of general tertiary systems using nickel catalysis. The scope of this operationally simple method is broad, and it can be used to simplify the synthesis of medicinally relevant motifs bearing quaternary centers.
Cobalt‐Catalyzed α‐Arylation of Substituted α‐Bromo α‐Fluoro β‐Lactams with Diaryl Zinc Reagents: Generalization to Functionalized Bromo Derivatives
作者:Mélanie M. Lorion、Vanessa Koch、Martin Nieger、Hi‐Yung Chen、Aiwen Lei、Stefan Bräse、Janine Cossy
DOI:10.1002/chem.202001721
日期:2020.10.15
A cobalt‐catalyzed cross‐coupling of α‐bromo α‐fluoro β‐lactams with diarylzinc or diallylzinc reagents is herein disclosed. The protocol proved to be general, chemoselective and operationally simple allowing the C4 functionalization of β‐lactams. The substrate scope was expanded to α‐bromo lactams and amides, α‐bromo lactones and esters as well as N‐ and O‐containing heterocycles.