Nickel-Catalyzed Denitrogenative Annulation of 1,2,3-Benzotriazin-4-(3<i>H</i>
)-ones with Benzynes for Construction of Phenanthridinone Scaffolds
作者:Vijaykumar H. Thorat、Nitinkumar Satyadev Upadhyay、Masahiro Murakami、Chien-Hong Cheng
DOI:10.1002/adsc.201701143
日期:2018.1.17
The synthesis of phenanthridinones via denitrogenative annulation of 1,2,3‐benzotriazin‐4‐(3H)‐ones with arynes catalysed by Ni(0)/dppm was successfully developed. A variety of phenanthridinones were prepared in good to excellent yields. Based on this method, nature product, N‐methylcrinasidine, was synthesized.
1,2,3-Benzotriazin-4(3H)-ones and 1,2,3,4-benzothiatriazine 1,1(2H)-dioxide reacted with isocyanides in the presence of a palladium catalyst to give 3-(imino)isoindolin-1-ones and 3-(imino)thiaisoindoline 1,1-dioxides, respectively, in high yield. An intermediate azapalladacycle was generated through denitrogenation of the triazine moiety, and an isocyanide was incorporated therein.
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。
Trifluoroacetic Acid-Mediated Denitrogenative <i>ortho</i>-Hydroxylation of 1,2,3-Benzotriazin-4(3<i>H</i>)-ones: A Metal-Free Approach
作者:Kanagaraj Madasamy、Madasamy Hari Balakrishnan、Ramaraju Korivi、Subramaniyan Mannathan
DOI:10.1021/acs.joc.2c00354
日期:2022.7.1
An efficient trifluoroacetic acid-mediated denitrogenative hydroxylation of 1,2,3-benzotriazin-4(3H)-ones is described. This metal-free approach is compatible with a wide range of 1,2,3-benzotriazin-4(3H)-ones, affording ortho-hydroxylated benzamides in good to high yields with a short reaction time. The reaction is believed to proceed via a benzene diazonium intermediate. The synthetic utility of
描述了一种有效的三氟乙酸介导的 1,2,3-benzotriazin-4(3 H )-ones 的脱氮羟基化。这种不含金属的方法与多种 1,2,3-benzotriazin-4(3 H )-one相容,可在较短的反应时间内以良好至高产率提供邻羟基化苯甲酰胺。据信该反应通过苯重氮中间体进行。该反应的合成效用通过以良好收率制备抗微生物药物利肝素 C 和苯并恶嗪-2,4(3 H )-二酮类化合物得到成功证明。
Nickel-Catalyzed, Manganese-Assisted Denitrogenative Cross-Electrophile-Coupling of Benzotriazinones with Alkyl Halides for ortho-Alkylated Benzamides
作者:Fengze Wang、Yi Tong、Gang Zou
DOI:10.1021/acs.orglett.2c02182
日期:2022.8.12
Br, I) in the presence of manganese powder as a reductant has been developed. The reaction furnishes ortho-alkylated secondary benzamides in modest to good yields under mild conditions. The scope of the reaction is demonstrated with 25 examples, showing good tolerance of steric hindrance and common functional groups, thus providing an efficient protocol to ortho-alkylated benzamide derivatives without