Nickel-Catalyzed Denitrogenative<i>ortho</i>-Arylation of Benzotriazinones with Organic Boronic Acids: an Efficient Route to Losartan and Irbesartan Drug Molecules
作者:Vijaykumar H. Thorat、Nitinkumar Satyadev Upadhyay、Chien-Hong Cheng
DOI:10.1002/adsc.201800923
日期:2018.12.21
Denitrogenative ortho‐arylation, vinylation and methylation of 1,2,3‐benzotriazin‐4‐(3H)‐ones with organic boronic acids catalyzed by nickel complexes to give a wide range of o‐substituted benzamides were demonstrated. Further, the catalytic reaction is successfully applied to the synthesis of the popular hypertensive drugs losartan and irbesartan in high yields.
Metal‐Free, Visible‐Light Promoted Intramolecular Azole C−H Bond Amination Using Catalytic Amount of I
<sub>2</sub>
: A Route to 1,2,3‐Triazolo[1,5‐
<i>a</i>
]quinazolin‐5(4
<i>H</i>
)‐ones
作者:Weigen Du、Hongtai Huang、Tiebo Xiao、Yubo Jiang
DOI:10.1002/adsc.202000917
日期:2020.11.18
A metal‐free, visible‐light promoted intramolecular azole C−H bond amination for the rapid and efficient synthesis of pharmaceutical important 1,2,3‐triazolo[1,5‐a]quinazolin‐5(4H)‐ones has been developed. Employing 2‐(1,2,3‐triazol‐1‐yl)benzamides as the easily available precursors and catalytic amount of I2 as an initiator, the desired product were isolated in moderate to excellent yiels with a broad
快速有效合成重要的1,2,3-三唑[1,5 - a ]喹唑啉-5(4 H)-酮的无金属,可见光促进的分子内唑氢键形成胺化反应发达。使用2-(1,2,3-三唑-1-基)苯甲酰胺作为易得的前体,并以催化量的I 2作为引发剂,以中等至优异的收率分离出所需的产物,具有广泛的底物范围和良好的功能小组宽容。此外,该协议具有条件温和,操作简单且易于扩展的特点。初步的机理研究表明,反应过程中可能涉及自由基途径。
Palladium Catalyzed Regioselective Synthesis of Substituted Biaryl Amides through Decarbonylative Arylation of Phthalimides
作者:Partha Kumar Samanta、Papu Biswas
DOI:10.1021/acs.joc.8b03157
日期:2019.4.5
cross-coupling of N-substituted phthalimides with arylhalide provides a single step direct access of a wide range of synthetically appealing ortho-substituted biarylamides in high yields through unique carbonyl (CO) replacement. The reaction proceeds through a ligand-freecondition and is well tolerant to the diverse functionality of both imide and halide units. The reaction negates any requirement of
Synthesis of <i>ortho</i>-arylated and alkenylated benzamides by palladium-catalyzed denitrogenative cross-coupling reactions of 1,2,3-benzotriazin-4(3<i>H</i>)-ones with organoboronic acids
作者:Madasamy Hari Balakrishnan、Madasamy Kanagaraj、Velayudham Sankar、Mahesh Kumar Ravva、Subramaniyan Mannathan
DOI:10.1039/d1nj03706d
日期:——
established by using phenyl boronate ester as the coupling partner. The reaction is believed to proceed via a five-membered aza-palladacyclic intermediate. DFT calculations were studied comparing the reactivity of palladium and nickel complexes in the five-membered aza-metallacycle formation from 1,2,3-benzotriazin-4(3H)-ones. The application of the reaction was successfully demonstrated by converting ortho-alkenylated
描述了一种有效的钯催化脱氮 Suzuki-Miyaura 型 1,2,3-苯并三嗪-4(3 H )-酮与有机硼酸的交叉偶联。该反应与各种芳基和烯基硼酸相容,以良好至高产率提供邻芳基化和烯基化苯甲酰胺。还成功地使用了杂芳族硼酸。与此同时,通过使用苯基硼酸酯作为偶联伙伴建立了偶联反应。据信该反应通过五元氮杂-钯环中间体进行。研究了 DFT 计算,比较了钯和镍配合物在 1,2,3-苯并三嗪-4(3 H)-那些。通过还原反应将邻-烯基化产物以高产率转化为邻-烷基化产物,成功地证明了该反应的应用。
Visible Light-Induced Photocatalyst-Free Aromatic Amidation for the Synthesis of 3,4-Dihydroquinolin-2(1H)-ones
Abstract A simple protocol has been proposed for the visible light-induced aromatic amidation reaction to afford 3,4-dihydroquinolin-2(1H)-ones. The amidation proceeded smoothly without any photocatalyst at room temperature, and the desired products were obtained in 46–72% yields.