Ruthenium(II)‐Catalyzed CH Activation with Isocyanates: A Versatile Route to Phthalimides
作者:Suman De Sarkar、Lutz Ackermann
DOI:10.1002/chem.201404261
日期:2014.10.20
A cationic ruthenium(II)‐complex was utilized in the efficient synthesis of phthalimide derivatives by CHactivation with synthetically useful amides. The reaction proceeded through a mechanistically unique insertion of a cycloruthenated species into a CHet multiple bond of isocyanate. The novel method also proved applicable for the synthesis of heteroaromatic unsymmetric diamides as well as a potent
Rh(III)-Catalyzed Aryl and Alkenyl C–H Bond Addition to Diverse Nitroalkenes
作者:Tyler J. Potter、David N. Kamber、Brandon Q. Mercado、Jonathan A. Ellman
DOI:10.1021/acscatal.6b03217
日期:2017.1.6
The transition-metal-catalyzed C–H bond addition to nitroalkenes has been developed. Very broad nitroalkene scope was observed for this Rh(III)-catalyzed method, including for aliphatic, aromatic, and β,β-disubstituted derivatives. Additionally, various directing groups and both aromatic and alkenyl C–H bonds were effective in this transformation. Representative nitroalkane products were converted
Chloroform‐mediated acylative coupling of amines and indoles has been developed. Indoles and amines in chloroform were treated with dimethylzinc in the presence of air, resulting in a three‐component acylative coupling reaction in which in‐situ generation of phosgene produces indole‐3‐carboxamides.
Rh<sup>III</sup>-Catalyzed Synthesis of Cyclopenta[<i>b</i>]carbazoles via Cascade C–H/C–C Bond Cleavage and Cyclization Reactions: Using Amide as a Traceless Directing Group
作者:Yanwei Wang、Bin Li、Baiquan Wang
DOI:10.1021/acs.orglett.9b03969
日期:2020.1.3
Rhodium-catalyzed cascade C-H/C-C cleavage and cyclization reactions of 3-amide substituted indoles with diynes to construct cyclopenta[b]carbazoles have been developed. A strategy amide worked as a novel traceless directing group along with C-C bondcleavage via Friedel-Crafts-retro reaction has been disclosed in this protocol. This method exhibits a broad substrate scope and tolerates various functional
Weakly Coordinating <i>tert</i>-Amide-Assisted Ru(II)-Catalyzed Synthesis of Azacoumestans via Migratory Insertion of Quinoid Carbene: Application in the Total Synthesis of Isolamellarins
作者:Souradip Sarkar、Rajarshi Samanta
DOI:10.1021/acs.orglett.2c01556
日期:2022.7.1
A weakly coordinating tert-amide-directed straightforward method was developed for the synthesis of azacoumestans using the corresponding azaheterocycle derivatives and diazonaphthoquinones under cheap Ru(II)-catalyzed conditions. The reaction proceeds via migratory insertion of quinoid carbene and subsequent Brønstead acid-mediated cyclization. The optimized C2-selective method offered a wide scope
开发了一种弱配位叔酰胺定向的直接方法,用于在廉价的 Ru(II) 催化条件下使用相应的氮杂杂环衍生物和重氮萘醌合成氮杂香豆素。该反应通过醌型卡宾的迁移插入和随后的布朗斯特酸介导的环化进行。优化的 C2 选择性方法提供了广泛的重要氮杂杂环化合物。通过开发的方案合成了生物活性天然产物,如异醇 A 和 B。初步机制研究强调了可能的机制途径。