Continuous-Flow Synthesis of Biaryls by Negishi Cross-Coupling of Fluoro- and Trifluoromethyl-Substituted (Hetero)arenes
作者:Stefan Roesner、Stephen L. Buchwald
DOI:10.1002/anie.201605584
日期:2016.8.22
continuous‐flow method for the regioselective arylation of fluoroarenes and fluoropyridines has been developed. The telescoped procedure reported here consists of a three‐step metalation, zincation, and Negishi cross‐coupling sequence, providing efficient access to a variety of functionalized 2‐fluorobiaryl products. Precise temperature control of the metalation step, made possible by continuous‐flow technology
A bulky carboxylic acid bearing one 1-adamantylmethyl and two methyl substituents at the α-position is demonstrated to work as an efficient carboxylate ligand source in Pd-catalyzed intermolecular C(sp2)–H bond arylation reactions.
Generation of Aryl Radicals from Aryl Halides: Rongalite-Promoted Transition-Metal-Free Arylation
作者:Fazhi Yu、Runyu Mao、Mingcheng Yu、Xianfeng Gu、Yonghui Wang
DOI:10.1021/acs.joc.9b01113
日期:2019.8.16
is reported. Rongalite as a novel precursor of super electron donors was used to initiate a series of electron-catalyzed reactions under mild conditions. These transition-metal-free radical chain reactions enable the efficient formation of C–C, C–S, and C–P bonds through homolytic aromatic substitution or SRN1 reactions. Moreover, the synthesis of antipsychoticdrug Quetiapine was performed on gram
t-butylperoxyesters of 1-adamantyl, 1-bicyclo[2,2,2]octyl and 1-biciclo[2.2.1]heptyl carboxylic acids. The reactivity of p-difluorobenzene relative to benzene indicated that bridgehead radicals possess nucleophiliccharacter.
Copper‐Catalysed Suzuki‐Miyaura Cross‐Coupling of Highly Fluorinated Aryl Boronate Esters with Aryl Iodides and Bromides and Fluoroarene−Arene π‐Stacking Interactions in the Products
作者:Yudha P. Budiman、Alexandra Friedrich、Udo Radius、Todd B. Marder
DOI:10.1002/cctc.201901220
日期:2019.11.7
combination of copper iodide and phenanthroline as the ligand is an efficientcatalyst for Suzuki‐Miyaura cross‐coupling of highly fluorinated boronate esters (aryl−Bpin) with aryl iodides and bromides to generate fluorinated biaryls in good to excellent yields. This method represents a nice alternative to traditional cross‐coupling methods which require palladiumcatalysts and stoichiometric amounts of