Rapid Access to Bi- and Tri-Functionalized Dibenzofurans and their Application in Selective Suzuki-Miyaura Cross Coupling Reactions
作者:Caroline Wern、Christian Ehrenreich、Dominik Joosten、Thorsten vom Stein、Herwig Buchholz、Burkhard König
DOI:10.1002/ejoc.201801286
日期:2018.11.8
Syntheses of 1,2-, 1,3-, 1,4-, 1,8-, 2,4-, 3,4-, 4,8-, 1,2,4-, 1,2,8- and 1,3,4-functionalized dibenzofurans in few steps with good to excellent yields starting from dibenzofuran-1-ol or -4-ol are presented. These rapidly accessible bi- or tri-functionalized building blocks are of great interest for the synthesis of bioactive substances or functional material development. Furthermore, for intermediates
Control of reactive site in palladium-catalyzed Grignard cross-coupling of arenes containing both bromide and triflate
作者:Takashi Kamikawa、Tamio Hayashi
DOI:10.1016/s0040-4039(97)01655-9
日期:1997.10
Reaction of 4-bromophenyl triflate (1) with phenylmagnesiumbromide in the presence of 5 mol % of PdCl2(dppp) gave 97% yield of 4-bromobiphenyl (2a), which was formed by selective replacement of triflate in 1 by phenyl. On the hand, bromide in 1 was substituted with the phenyl Grignard reagent selectively by use of PdCl2(meo-mop)2 to give 4-biphenyl triflate (3a) in high yield. The selective substitution
Organogelation enables fast organolithium cross-coupling reactions in air
作者:Paco Visser、Ben L. Feringa
DOI:10.1039/d3cc00756a
日期:——
on palladium-catalysed cross-coupling reactions using organolithium reagents has seen major breakthroughs in the past decade. However, the use of inert conditions, as well as slow addition of the organolithium species, is generally required. Here we describe the Pd-catalysed cross-coupling of C36H74-gelated organolithium reagents with aryl bromides. The reaction proceeds in 5 min at room temperature
在过去十年中,基于有机锂试剂的钯催化交叉偶联反应的 C-C 键形成取得了重大突破。然而,通常需要使用惰性条件以及缓慢添加有机锂物质。在这里,我们描述了 Pd 催化的 C 36 H 74凝胶化有机锂试剂与芳基溴化物的交叉偶联。反应在室温下进行 5 分钟,同时消除了以前需要的缓慢添加,并严格使用惰性气氛。至关重要的是,有机锂凝胶的使用方便了处理,并极大地提高了过程安全性,不需要任何特殊安全预防措施的克级转化就说明了这一点。
PROCESS FOR THE PRODUCTION OF ARYLAMINES
申请人:Merck Patent GmbH
公开号:US20220127251A1
公开(公告)日:2022-04-28
The invention relates to a process for producing compounds containing at least one arylamino group by means of a palladium-catalysed coupling reaction of an arylamino compound with an aryl compound, using LiOtBu as a base.