LiTMP Trans-Metal-Trapping of Fluorinated Aromatic Molecules: A Comparative Study of Aluminum and Gallium Carbanion Traps
作者:Ross McLellan、Marina Uzelac、Alan R. Kennedy、Eva Hevia、Robert E. Mulvey
DOI:10.1002/anie.201706064
日期:2017.8.1
(TMT) to a series of key fluorinated aromatics. In TMT, LiTMP performs the metalation, while an organometallic trap intercepts the emergent carbanion. This study contrasts the trapping abilities of iBu2AlTMP and Ga(CH2SiMe3)3, structurally mapping their TMT reactions and probing relative stabilities of metalated fluoroaromatic intermediates by NMR studies. Results show the installed Al−C(aryl) bonds are
氟芳族支架由于锂化中间体的低稳定性而对锂化提出了挑战。在这里,我们将跨金属捕集(TMT)应用于一系列关键的氟化芳族化合物。在TMT中,LiTMP进行金属化,而有机金属陷阱捕获新兴的碳负离子。本研究对比了i Bu 2 AlTMP和Ga(CH 2 SiMe 3)3的俘获能力。,通过NMR研究在结构上绘制它们的TMT反应图,并探测金属化的氟代芳族中间体的相对稳定性。结果表明,与Ga-C(芳基)物种相比,已安装的Al-C(芳基)键更容易通过苯炔形成和Li-F释放而分解。因此,后者与产生酮的苯甲酰氯的交叉偶联反应证明,对于向前的反应性更好。