Pd-Catalyzed α-Arylation of α,α-Difluoroketones with Aryl Bromides and Chlorides. A Route to Difluoromethylarenes
作者:Shaozhong Ge、Wojciech Chaładaj、John F. Hartwig
DOI:10.1021/ja501117v
日期:2014.3.19
α-difluoroketones with aryl and heteroaryl bromides and chlorides catalyzed by an air- and moisture-stable palladacyclic complex containing P(t-Bu)Cy2 as ligand. The combination of this Pd-catalyzed arylation and base-induced cleavage of the acyl–aryl C–C bond within the α-aryl-α,α-difluoroketone constitutes a one-pot, two-step procedure to synthesize difluoromethylarenes from aryl halides. A broad range
Mono et difluoration electrochimiques de groupes benzyliques
作者:Eliane Laurent、Bernard Marquet、Robert Tardivel
DOI:10.1016/s0040-4020(01)89079-7
日期:——
a fluorinating reagent allowed to introduce a fluorine atom in α position of electron withdrawing group via carbocation + (ECBECN mechanism). Whatever the E group monofluorides are obtained in good yields from paramethoxy derivatives (R=p-OCH3). In this case, by raising the potential of working electrode after the monofluorination step, gem difluorides can be directly prepared from 1. When the substituent
以CH 3 CN为溶剂,以Et 3 N,3HF为氟化剂,对苄基化合物进行阳极氧化,通过碳正离子+(EC B EC N机理)在吸电子基团的α位置引入氟原子。从对甲氧基衍生物(R = p-OCH 3)以高收率获得任何E基团一氟化物。在这种情况下,通过在单氟化步骤之后提高工作电极的电势,可以直接从1制备二氟化宝石。当苯环的取代基与甲氧基不同时,氟化物2和乙酰胺的混合物 通常可以得到H 2 O 3,这两种化合物的比例与阳离子稳定性有关。
[EN] METAL-CATALYZED COUPLING OF ARYL AND VINYL HALIDES WITH ALPHA, ALPHA-DIFLUOROCARBONYL COMPOUNDS<br/>[FR] COUPLAGE CATALYSÉ MÉTALLIQUE D'HALOGÉNURES D'ARYLE ET DE VINYLE AVEC DES COMPOSÉS ALPHA, ALPHA-DIFLUOROCARBONYLE
申请人:UNIV CALIFORNIA
公开号:WO2014165861A1
公开(公告)日:2014-10-09
The coupling of aryl, heteroaryl, and vinyl halides with α,α-difluoroketones or silyl ethers or siylenol ethers of α,α-difluoroketones and α,α-difluoroamides and esters are described. Further derivatization of the coupling products (such as ketone cleavage and Baeyer-Villiger oxidation) is also described.
METAL-CATALYZED COUPLING OF ARYL AND VINYL HALIDES WITH ALPHA, ALPHA-DIFLUOROCARBONYL COMPOUNDS
申请人:THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
公开号:US20160052854A1
公开(公告)日:2016-02-25
The coupling of aryl, heteroaryl, and vinyl halides with α,α-difluoroketones or silyl ethers or siylenol ethers of α,α-difluoroketones and α,α-difluoroamides and esters are described. Further derivatization of the coupling products (such as ketone cleavage and Baeyer-Villiger oxidation) is also described.
Palladium catalyzed direct α-arylation of α,α-difluoroketones with aryl bromides
作者:Chen Guo、Ruo-Wen Wang、Feng-Ling Qing
DOI:10.1016/j.jfluchem.2012.05.001
日期:2012.11
The palladium-catalyzed direct alpha-arylations of alpha,alpha-difluoroketones with diverse aryl bromides have been developed by using rac-BINAP as ligand and Cs2CO3 as a mild base in xylene. This method provides an efficient and straightforward access to a variety of alpha-aryl-alpha,alpha-difluoroketones with broad substrate scope. (C) 2012 Elsevier B.V. All rights reserved.