Copper-catalyzed ortho-C–H amination of protected anilines with secondary amines
作者:Ángel Manu Martínez、Nuria Rodríguez、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1039/c3cc49633c
日期:——
A practical Cu-catalyzed picolinamide-directed o-amination of anilines showing excellent mono-substitution selectivity and high functional group tolerance has been developed.
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.
PdII-Catalyzed CH Olefination of N-(2-Pyridyl)sulfonyl Anilines and Arylalkylamines
作者:Alfonso García-Rubia、Beatriz Urones、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1002/anie.201105611
日期:2011.11.11
N‐(2‐pyridyl)sulfonyl group acts as a removable directing group in the PdII‐catalyzed aryl CH ortho alkenylation of N‐alkyl aniline, benzylamine, and phenethylamine derivatives with electron‐poor alkenes. The products were obtained in high yields (70–90 %) and with complete regiocontrol. The mild reductive N‐sulfonyl removal enables the construction of a variety of nitrogen heterocycles. EWG=electron‐withdrawing
Metal Free Bi(hetero)aryl Synthesis: A Benzyne Truce-Smiles Rearrangement
作者:Catherine M. Holden、Shariar M. A. Sohel、Michael F. Greaney
DOI:10.1002/anie.201510236
日期:2016.2.12
A new benzyne transformation is described that affords versatile biaryl structures without recourse to transition-metal catalysis or stoichiometric amounts of organometallic building blocks. Aryl sulfonamides add to benzyne upon fluoride activation, and then undergo an aryl Truce-Smiles rearrangement to afford biaryls with sulfur dioxide extrusion. The reaction proceeds under simple reaction conditions
Nickel-Catalyzed Intramolecular Desulfitative C—N Coupling: A Synthesis of Aromatic Amines
作者:Jiangjun Liu、Xiuwen Jia、Xuemeng Chen、Haotian Sun、Yue Li、Søren Kramer、Zhong Lian
DOI:10.1021/acs.joc.0c00009
日期:2020.4.17
intramolecular C—N coupling reaction via SO2 extrusion is presented. The use of a catalytic amount of BPh3 allows the transformation to take place under much milder conditions (60 °C) than previously reported C—N coupling reactions by CO or CO2 extrusion (160–180 °C). In addition, this method displays good functional group tolerance and versatility, as it can be applied to the synthesis of dialkyl aryl