Rhodium(<scp>iii</scp>)-catalysed aerobic synthesis of highly functionalized indoles from N-arylurea under mild conditions through C–H activation
作者:Subban Kathiravan、Ian A. Nicholls
DOI:10.1039/c4cc06020b
日期:——
arylation of alkynes using copper as the terminal oxidant for regeneration of the catalytically active species under aerobic conditions is described. This novel C-H activation reaction was applied to the synthesis of a wide range of substituted indolesfrom N-arylureas.
Copper‐Catalyzed Mild Nitration of Protected Anilines
作者:Elier Hernando、Rafael R. Castillo、Nuria Rodríguez、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1002/chem.201404000
日期:2014.10.20
A practical copper‐catalyzed direct nitration of protected anilines, by using one equivalent of nitric acid as the nitrating agent, has been developed. This procedure features mild reaction conditions, wide structural scope (with regard to both N‐protecting group and arene substitution), and high functional‐group tolerance. Dinitration with two equivalents of nitric acid is also feasible.
Merging C–H Activation and Alkene Difunctionalization at Room Temperature: A Palladium-Catalyzed Divergent Synthesis of Indoles and Indolines
作者:Manash Kumar Manna、Asik Hossian、Ranjan Jana
DOI:10.1021/ol5036968
日期:2015.2.6
A palladium-catalyzed 1,2-carboamination through C–H activation at room temperature is reported for the synthesis of 2-arylindoles, and indolines from readily available, inexpensive aryl ureas and vinyl arenes. The reaction initiates with a urea-directed electrophilic ortho palladation, alkene insertion, and β-hydride elimination sequences to provide the Fujiwara–Moritani arylation product. Subsequently
One-pot synthesis of 2,3-difunctionalized indoles via Rh(<scp>iii</scp>)-catalyzed carbenoid insertion C–H activation/cyclization
作者:Honggui Lv、Jingjing Shi、Bo Wu、Yujuan Guo、Junjun Huang、Wei Yi
DOI:10.1039/c7ob01977g
日期:——
Reported herein is the first Rh(III)-catalyzedcarbenoidinsertionC–H activation/cyclization of N-arylureas and α-diazo β-keto esters. The redox-neutral reaction has the following features: good to excellent yields, broad substrate/functional group tolerance, exclusive regioselectivity, and no need for additional oxidants or additives, which render this methodology as a more efficient and versatile
Direct<i>ortho</i>-Trifluoroethylation of Aromatic Ureas by Palladium Catalyzed C-H activation: A Missing Piece of Aromatic Substitutions
作者:Szabolcs Kovács、Balázs L. Tóth、Gábor Borsik、Tamás Bihari、Nóra V. May、András Stirling、Zoltán Novák
DOI:10.1002/adsc.201601136
日期:2017.2.2
Development of direct late‐stage installation of alkyl groups into aromatic systems is an important and challenging task of current organic chemistry. In spite of the existing functionalization methods in organic chemistry for the substitution reactions on aromatic systems, the direct alkylation of aromatic ureas is unknown. Herein, as a first example we report a novel palladium catalyzed fluoroalkylation