Improved Process for the Preparation of 2-Methyl-3-trifluoromethylaniline: A Versatile Intermediate for Flunixin Synthesis
摘要:
A detailed new experimental investigation into the synthesis of Flunixin via 2-methyl-3-trifluoromethylaniline is described. The coupling process between 2-methyl-3-trifluoromethylaniline and 2-chloronicotinate was achieved stoichiometrically and in high yield, when ethylene glycol was used as reaction solvent at 160-degrees-C.
Palladium(II)-Catalyzed Oxidative Homo- and Cross-Coupling of Aryl <i>ortho</i>-sp<sup>2</sup> C–H Bonds of Anilides at Room Temperature
作者:Chong Mei、Wenjun Lu
DOI:10.1021/acs.joc.8b00120
日期:2018.4.20
The preparation of secondary 2,2′-bisanilides has been successfully achieved through an oxidative coupling of aryl ortho-sp2 C–H bonds of anilides in the presence of catalytic Pd(OAc)2 and K2S2O8 as an oxidant in MsOH/CF3CO2H (TFA) at roomtemperature (25 °C). The aromatic rings of anilides substituted by various electron-donating or electron-withdrawing groups are tolerant in these coupling reactions
通过在催化性Pd(OAc)2和K 2 S 2 O 8作为氧化剂的存在下,通过对苯甲酸酯的芳基邻-sp 2 C-H键进行氧化偶联,成功地完成了2,2'-双苯胺的制备。在室温(25°C)下在MsOH / CF 3 CO 2 H(TFA)中溶解。在这些偶联反应中,被各种给电子或吸电子基团取代的苯甲酸酯的芳环是可容忍的。
Ligand Promoted Olefination of Anilides for Indirectly Introducing Fluorinated Functional Groups via Palladium Catalyst
作者:Dongjie Wang、Xu Xu、Jingyu Zhang、Yingsheng Zhao
DOI:10.1021/acs.joc.0c02701
日期:2021.2.5
We report a palladium-catalyzed, ligand promoted, C–H fluorine-containing olefination of anilides with 4-bromo-3,3,4,4-tetrafluorobutene as the fluorinated reagent, which has a potential transformation into other compounds due to its -CF2CF2Br functional group. -CF2CF2H was obtained by using the mild reducing agent sodium borohydride. Bioactivecompounds such as aminoglutethimide derivative and propham
Insertion of Benzene Rings into the Amide Bond: One-Step Synthesis of Acridines and Acridones from Aryl Amides
作者:Didier G. Pintori、Michael F. Greaney
DOI:10.1021/ol902568x
日期:2010.1.1
Insertion of benzene rings into the amide bond using the reactive intermediate benzyne is described. Aromatic amides undergo smooth insertion when treated with O-triflatophenyl silane benzyne precursors, producing versatile aminobenzophenone products in good to excellent yield. The process is entirely metal-free and has been exemplified on the synthesis of biologically active acridones and acridines
Use of the Wilkinson Catalyst for the<i>ortho</i>-CH Heteroarylation of Aromatic Amines: Facile Access to Highly Extended π-Conjugated Heteroacenes for Organic Semiconductors
作者:Yumin Huang、Di Wu、Jingsheng Huang、Qiang Guo、Juan Li、Jingsong You
DOI:10.1002/anie.201406445
日期:2014.11.3
An unprecedented catalytic system composed of the Wilkinson catalyst [Rh(PPh3)3Cl] and CF3COOH enabled the highly regioselective cross‐coupling of aromatic amines with a variety of heteroarenes through dual CH bond cleavage. This protocol provided a facile and rapid route from readily available substrates to (2‐aminophenyl)heteroaryl compounds, which may be conveniently transformed into highly extended
CuCl-catalyzed ortho trifluoromethylation of arenes and heteroarenes with a pivalamido directing group
作者:Shangjun Cai、Chao Chen、Zelin Sun、Chanjuan Xi
DOI:10.1039/c3cc41331d
日期:——
The CuCl catalyzed direct trifluoromethylation of sp2 C–H bonds has been realized, using the Togni reagent as the CF3 source. This reaction achieves the goal of regio-selectively converting C–H into C–CF3 with ecological and readily available starting materials.