Synthesis of Biaryls by Pd-Catalyzed Decarboxylative Homo- and Heterocoupling of Substituted Benzoic Acids
作者:Kai Xie、Sizhuo Wang、Zhiyong Yang、Jidan Liu、Anwei Wang、Xiujian Li、Ze Tan、Can-Cheng Guo、Wei Deng
DOI:10.1002/ejoc.201100913
日期:2011.10
base, symmetrical and unsymmetrical biaryls can be readily synthesized through the Pd-catalyzed decarboxylative homo- and heterocoupling of substituted benzoic acids. The reaction gave the desired products in 40–90 % yield and is compatible with 2-nitro-, 2-methoxy-, 2-fluoro-, and 2-chloro-substituted benzoic acids.
Highly efficient heterogeneous copper-catalyzed decarboxylative cross-coupling of potassium polyfluorobenzoates with aryl halides leading to polyfluorobiaryls
作者:Yang Lin、Mingzhong Cai、Zhiqiang Fang、Hong Zhao
DOI:10.1039/c7ra05711c
日期:——
reaction of potassium polyfluorobenzoates with aryl iodides and bromides was achieved in diglyme or DMAc at 130 or 160 °C in the presence of 10–20 mol% of a 1,10-phenanthroline-functionalized MCM-41-immobilized copper(I) complex, [MCM-41-Phen-CuI], yielding a variety of polyfluorobiaryls in good to excellent yields. This heterogeneous copper(I) complex could easily be prepared via a simple procedure
For improvement of the duration of action of FR35447 (I), 2-(biphenylimino)imidazolidines (III) were synthesized and their hypotensive activity was tested against conscious normotensive rats. 2-(4'-Fluoro-[1, 1'-biphenyl]-2-ylimino)imidazolidine (III l) exhibited superior hypotensive potency and was comparable to clonidine (II) in its duration of action.The structure-activity relationships of III are also described.