New Ligands for Copper-Catalyzed CN Coupling Reactions at Gentle Temperature
作者:Jinyue Su、Yatao Qiu、Sheng Jiang、Dayong Zhang
DOI:10.1002/cjoc.201400147
日期:2014.8
Pyridin‐2‐ol‐N‐oxide was designed as an efficient ligand for the couplingreaction of aryl iodides, aryl bromides and aryl chlorides, respectively, with primary amines, cyclic secondary amines or N‐containing heterocycles at room or moderate temperature. The catalytic system showed great functional groups tolerance and excellent selective reactivity.
Palladium-Mediated Direct Synthesis of N-Substituted 4-Methyl- and 4-Ethylisoquinolone Derivatives
作者:Krishna Majumdar、Santanu Chakravorty、Krishanu Ray
DOI:10.1055/s-2008-1067244
日期:2008.9
N-Substituted 4-methyl- and 4-ethylisoquinolone derivatives are prepared from different N-allylbenzamide derivatives in a single step through a ligand-free palladium-mediated intramolecular Heck cyclization.
Platinum(II)-Crosslinked Single-Chain Nanoparticles: An Approach towards Recyclable Homogeneous Catalysts
作者:Nicolai D. Knöfel、Hannah Rothfuss、Johannes Willenbacher、Christopher Barner-Kowollik、Peter W. Roesky
DOI:10.1002/anie.201700718
日期:2017.4.24
successful formation of well‐defined PtII‐SCNPs was evidenced by size exclusion chromatography, dynamic light scattering, nuclearmagneticresonance (1H, 31P1H}, 195Pt), and diffusion‐ordered spectroscopy. Finally, the activity of the PtII‐SCNPs as homogeneous, yet recyclable catalyst was successfully demonstrated using the example of the amination of allyl alcohol.
我们介绍了铂(II)交联的单链纳米颗粒(Pt II -SCNPs)的合成和深入表征,以证明其作为可回收均相催化剂的应用。具体而言,苯乙烯和4-(二苯基膦基)苯乙烯的线性前体共聚物是通过硝基氧介导的聚合反应合成的。沿骨架的三芳基膦配体部分允许通过在稀溶液中添加[Pt(1,5-环辛二烯)Cl 2 ]进行单链的分子内交联。明确定义的PT的成功形成II -SCNPs通过尺寸排阻色谱法,动态光散射,核磁共振(证明1 H,31 p 1个H},195 Pt)和扩散有序光谱学。最后,以烯丙醇胺化为例成功地证明了Pt II- SCNPs是均相且可回收的催化剂的活性。
Copper-Catalyzed Multicomponent Reactions of Intramolecular and Intermolecular Thiotrifluoromethylation of Alkenes: Access to CF<sub>3</sub>–Containing 2-Iminothiazolidines and Isothioureas
作者:Sainan Liu、Liqin Jiang
DOI:10.1021/acs.orglett.2c02854
日期:2022.10.7
at 75 °C. An intermolecular multicomponent reaction of thioureas, activated and unactivatedalkenes, and Togni reagent II has also been developed under DMAP in acetonitrile at roomtemperature. These two alkene difunctionalization reactions provide CF3-containing 2-iminothiazolindines and isothioureas in moderate to excellent yields with broad substrate scope and good functional group tolerance, respectively
Photo‐triggered Intramolecular Radical Tandem Regioselective Alkylation/Cyclization of 1,
<scp>6‐Dienes</scp>
with
<scp>Redox‐Active</scp>
Esters Enabled by an
<scp>EDA</scp>
Complex
作者:Bin Sun、Lan Ling、Xiaohui Zhuang、Lulu Yang、Jieli Yin、Can Jin
DOI:10.1002/cjoc.202200516
日期:2023.1
radical tandem alkylation/cyclization between 1,6-dienes and redox-active esters has been developed, affording a series of N-aryl pyrrolidine-2-ones in moderate to good yields. The transformation is driven by the formation of an electron-donor-acceptor (EDA) complex and a subsequent single electron transfer (SET) process. This photocatalyst-free protocol features excellent regioselectivity, mild conditions