<i>N</i>-Arylation of (hetero)arylamines using aryl sulfamates and carbamates <i>via</i> C–O bond activation enabled by a reusable and durable nickel(0) catalyst
elemental analysis techniques. The reaction proceeded via carbon–oxygen bondcleavage of (hetero)aryl carbamates and sulfamates under simple and mild conditions without the use of any external ligands. This method demonstrated functional group tolerance in the N-arylation of various nitrogen-containing compounds as well as aliphatic amines, anilines, pyrroles, pyrazoles, imidazoles, indoles, and indazoles
已经开发出了一种有效且通用的芳基胺化方案,使用了可磁回收的Ni(0)基纳米催化剂。该新型稳定催化剂是在EDTA改性的Fe 3 O 4 @SiO 2上制备的,并通过FT-IR,EDX,TEM,XRD,DLS,FE-SEM,XPS,NMR,TGA,VSM,ICP和元素分析技术进行了研究。该反应通过在简单温和的条件下不使用任何外部配体的情况下,通过(杂)芳基氨基甲酸酯和氨基磺酸酯的碳-氧键裂解来进行。该方法证明了N中的官能团耐受性各种含氮化合物以及脂肪族胺,苯胺,吡咯,吡唑,咪唑,吲哚和吲唑的芳基化,收率良好。此外,该催化剂可以通过使用外部磁场容易地回收,并且可以直接重复使用至少六次而不会显着降低其活性。
One-Pot Synthesis of O-Aryl Carbamates
作者:Marc Adler、Sami Varjosaari、Paolo Suating
DOI:10.1055/s-0035-1560726
日期:——
interest. A simple, versatile, one-pot procedure for the synthesis of substituted O-aryl carbamates has been developed, and a protocol is henceforth described. N-Substituted carbamoyl chloride is formed in situ and subsequently reacted with a substituted phenol, avoiding the direct manipulation of sensitive reactants. This procedure offers an economical and efficient route to many compounds of interest
Photochemically Driven Nickel‐Catalyzed Carboxylative C−N Coupling: Scope and Mechanism**
作者:Seifallah Abid、Kevin P. Quirion、Yi Yang、Renhe Tang、Binh Khanh Mai、Peng Liu、Anis Tlili
DOI:10.1002/chem.202301271
日期:2023.8.4
The carboxylative Buchwald–Hartwigamination is disclosed herein under mild conditions of temperature and under atmospheric pressure of CO2. The key to success is the use of a dual strategy organophotocatalysis/nickel catalysis under visible light irradiation. The developed conditions demonstrated high functional group tolerance toward (hetero)aryl iodide and bromide. Furthermore, preliminary mechanistic
Air‐Stable Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>‐EDTA‐Ni(0) as an Efficient Recyclable Magnetic Nanocatalyst for Effective Suzuki‐Miyaura and Heck Cross‐Coupling via Aryl Sulfamates and Carbamates
The synthesis of inexpensive and novel air‐stable Ni(0) nanoparticles immobilized on the EDTA‐modified Fe3O4@SiO2 nanocatalyst was investigated in Suzuki‐Miyaura and Heckcross‐couplingreactions. This catalytic system displayed a greatly improved substrate scope for the carbon–carbon bond formations starting from a wide range of green and economical electrophiles aryl and heteroaryl carbamates and
廉价且新颖的,稳定的,稳定在EDTA修饰的Fe 3 O 4 @SiO 2上的Ni(0)纳米颗粒的合成在Suzuki-Miyaura和Heck交叉偶联反应中研究了纳米催化剂。该催化体系通过在温和,操作简单的反应条件下通过高效方法,从广泛的绿色和经济亲电氨基甲酸酯和杂芳基氨基甲酸酯和氨基磺酸盐开始,显着改善了碳-碳键形成的底物范围。合成的多相催化剂还通过FT-IR,TEM,XRD,DLS,FE-SEM,UV-Vis,EDX,XPS,TGA,NMR,VSM,ICP和元素分析技术进行了全面表征。可以通过外部磁场容易地回收异质磁性纳米催化剂,并且在催化剂的沥滤可忽略不计并且活性没有实质性降低的情况下,至少七次重复用于接下来的反应至少七次。所有这些亮点使本协议变得有趣,
Rhodium-Catalyzed C–O Bond Alkynylation of Aryl Carbamates with Propargyl Alcohols
作者:Kosuke Yasui、Naoto Chatani、Mamoru Tobisu
DOI:10.1021/acs.orglett.8b00674
日期:2018.4.6
The rhodium-catalyzedalkynylation of aryl carbamates with propargyl alcohols is described. This methodology can provide aryl acetylenes from aryl carbamates via C–O bond activation. The use of propargyl alcohols as alkynylating agents allows the use of a variety of functional groups that are incompatible with organometallic nucleophiles. This reaction also serves to broaden the utility of a carbamate