N-heterocyclic carbene-catalysed pentafluorophenylation of aldehydes
作者:Guang-Fen Du、Fen Xing、Cheng-Zhi Gu、Bin Dai、Lin He
DOI:10.1039/c5ra05487g
日期:——
N-heterocyclic carbenes have been utilized as highly efficient organocatalysts to catalyse multifluorophenylation of aldehydes with fluorinated aryltrimethylsilanes to afford the corresponding adducts in 49–99% yields.
A combination of dimethylzinc, perfluoroalkyliodide, and LiCl afforded a new type of perfluoroalkyl (RF) zinc ate complex. These complexes show much greater thermal stability than conventional perfluorinated metal species, such as RF–lithium species and Grignardreagents, and they can be used at room temperature or higher. The results of DFT calculations on the origin of the enhanced stability are
二甲基锌,全氟烷基碘化物和LiCl的组合提供了一种新型的全氟烷基(R F)锌盐配合物。这些络合物显示出比常规的全氟化金属物种(例如R F –锂物种和格氏试剂)更高的热稳定性,并且可以在室温或更高温度下使用。报道了DFT计算的结果,指出了增强的稳定性的起源,并证明了R F-锌酸盐配合物的合成效用。
Transition Metal Catalyst‐Free, Base‐Promoted 1,2‐Additions of Polyfluorophenylboronates to Aldehydes and Ketones
作者:Zhiqiang Liu、Goutam Kumar Kole、Yudha P. Budiman、Ya‐Ming Tian、Alexandra Friedrich、Xiaoling Luo、Stephen A. Westcott、Udo Radius、Todd B. Marder
DOI:10.1002/anie.202103686
日期:2021.7.19
A novel protocol for the transition metal-free 1,2-addition of polyfluoroaryl boronate esters to aldehydes and ketones is reported, which provides secondary alcohols, tertiary alcohols, and ketones. Control experiments and DFT calculations indicate that both the ortho-F substituents on the polyfluorophenyl boronates and the counterion K+ in the carbonate base are critical. The distinguishing features
报道了一种将多氟芳基硼酸酯与醛和酮进行无过渡金属 1,2-加成的新方案,可提供仲醇、叔醇和酮。对照实验和 DFT 计算表明,多氟苯基硼酸酯上的邻位 F 取代基和碳酸盐碱中的抗衡离子 K +都很关键。该方法的显着特点包括使用市售起始原料以及与多种羰基化合物进行广泛的反应,从而获得中等至优异的产率。在这一系列外消旋多氟芳基甲醇中,涉及 O−H⋅⋅⋅O 和 O−H⋅⋅⋅N 氢键以及芳烃-全氟芳烃相互作用的有趣结构特征也得到了解决。
Dehydrative Allylation of 2-Alkylbenzophenones with Allylic Alcohols
Herein reported is a dehydrative allylation reaction of 2-alkylbenzophenones with allylic alcohols promoted by light and palladium. Photoirradiation of 2-alkylbenzophenones generates nucleophilic s...