Nickel-Catalyzed Cross-Electrophile Coupling between C(sp<sup>2</sup>)–F and C(sp<sup>2</sup>)–Cl Bonds by the Reaction of <i>ortho</i>-Fluoro-Aromatic Amides with Aryl Chlorides
作者:Itsuki Nohira、Naoto Chatani
DOI:10.1021/acscatal.1c01102
日期:2021.4.16
between C(sp2)–Fbonds in ortho-fluoro-substituted aromatic amides and C(sp2)–Cl bonds in aryl chlorides in the presence of Zn as a reductant and LiOtBu as a base, and LiCl and ZnCl2 as additives is reported. The reaction displayed excellent functional group tolerance and a broad substrate scope. The reaction was also applicable to cross-electrophile coupling between C(sp2)–F and C(sp2)–O bonds in an
在锌为还原剂和LiO t Bu为原子的情况下,邻氟取代的芳族酰胺中的C(sp 2)-F键与芳基氯中的C(sp 2)-Cl键之间的镍催化交叉亲电子偶联。据报道,LiCl和ZnCl 2作为添加剂。该反应显示出优异的官能团耐受性和广泛的底物范围。该反应也适用于甲苯磺酸芳基酯和三氟甲磺酸酯衍生物中C(sp 2)–F和C(sp 2)–O键之间的亲电子交联。
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.
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-Photocatalyzed Synthesis of Phenanthridinones and Quinolinones via Direct Oxidative C–H Amidation
作者:Yonghoon Moon、Eunyoung Jang、Soyeon Choi、Sungwoo Hong
DOI:10.1021/acs.orglett.7b03600
日期:2018.1.5
A straightforward synthetic strategy to construct biologically relevant phenanthridinones and quinolinones was developed via visible-light-promoted direct oxidative C-H amidation. In this photocatalytic system, amidyl radicals can be generated by homolysis of the N-H bond of simple amide precursors via single-electron transfer under blue LED illumination, which leads to oxidative intramolecular C-H amidation. Moreover, an efficient synthetic strategy using a photocascade enabled facile assembly of quinolinone structures through a catalytic sequence involving triplet energy (E-T) transfer based E/Z olefin isomerization and subsequent photocatalytic generation of amidyl radical intermediates.