Arylation of hydrocarbons enabled by organosilicon reagents and weakly coordinating anions
作者:Brian Shao、Alex L. Bagdasarian、Stasik Popov、Hosea M. Nelson
DOI:10.1126/science.aam7975
日期:2017.3.31
silicon substituents on an aryl ring set the stage for cleavage of strong C–H bonds. Turning benzene into a C–H bond cleaver Ask chemists for the best way to break a strong bond, and they will tell you to make an even stronger one. Shao et al. applied this principle by using silicon-fluorine bonds to break carbon-hydrogenbonds. They prepared benzene rings with adjacent fluorine and silicon substituents
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。
Synthesis of Enantiopure 1-Aryl-1-butylamines and 1-Aryl-3-butenylamines by Diastereoselective Addition of Allylzinc Bromide to Imines Derived from (R)-Phenylglycine Amide
作者:Jan Dalmolen、Marcel van der Sluis、José W. Nieuwenhuijzen、Auke Meetsma、Ben de Lange、Bernard Kaptein、Richard M. Kellogg、Quirinus B. Broxterman
DOI:10.1002/ejoc.200300662
日期:2004.4
The highlydiastereoselective addition of allylzinc bromide to imines derivedfrom (R)-phenylglycine amide is reported. Homoallylamines with high enantiomeric purity are obtained from the adducts in three steps on removal of the chiralauxiliary by means of a nonreductive protocol. Removal of the auxiliary by hydrogenation leads to the saturated amines, also in high enantiomeric purity. [reaction: see