The Halogen–Samarium Exchange Reaction: Synthetic Applications and Kinetics
作者:Lucile Anthore‐Dalion、Andreas D. Benischke、Baosheng Wei、Guillaume Berionni、Paul Knochel
DOI:10.1002/anie.201814373
日期:2019.3.18
Fast I/Sm and Br/Sm exchanges take place when various aromatic or heterocyclic iodides and bromides are treated with nBu2SmCl⋅4 LiCl and nBu3Sm⋅5 LiCl, respectively. The resulting organosamarium reagents were efficiently quenched with aldehydes, ketones, and imines. Also, they undergo acylations when treated with N,N‐dimethylamides leading to ketones. The rate of the Br/Sm exchange for a typical aryl
当分别用n Bu 2 SmCl·4 LiCl和n Bu 3 Sm·5 LiCl处理各种芳族或杂环碘化物和溴化物时,会发生快速的I / Sm和Br / Sm交换。将所得有机sa试剂有效地用醛,酮和亚胺淬灭。同样,当用N,N-二甲基酰胺处理时,它们会发生酰化反应,生成酮。确定了典型的芳基溴的Br / Sm交换速率,发现其比Br / Mg交换快8.5×10 5,这表明金属交换速率与碳的离子特性有关。金属键和对金属的电负性。
New Synthesis of Biaryls<i>via</i>Rh-Catalyzed Decarbonylative Suzuki-Coupling of Carboxylic Anhydrides with Arylboroxines
作者:L. J. Gooßen、J. Paetzold
DOI:10.1002/adsc.200404190
日期:2004.12
cross-coupling of aromatic carboxylicanhydrides or acid chlorides with triarylboroxines has been achieved for the first time under decarbonylation, giving rise to the unsymmetrical biaryls rather than the expected diaryl ketones. This newdecarbonylative Suzuki coupling, catalyzed by a [Rh(ethylene)2Cl]2/KF system, can be applied to aromatic, heteroaromatic and vinylic carboxylicanhydrides, potentially opening