Noncatalytic Pyridyl-Directed Alkylation and Arylation Carbon–Fluorine Bond of Polyfluoroarenes with Grignard Reagents
摘要:
Cross-coupling reaction of polyfluoroarenes with Grignard reagents via pyridine-directed cleavage of C-F bond in the absence of metal catalysts was developed. A possible mechanism was suggested.
A revisit of organoaluminumreagents for cross-coupling reactions has opened up several types of C–C bond formation protocols through cleavage of phenolic/alcoholic C–O and C–F and ammonium C–N bonds. Catalyzed by the commercially available NiCl2(PCy3)2 catalyst, these reactions proceed smoothly with a wide range of substrates and broad functional group compatibility, providing a versatile methodology
An iron-catalyzed C-C bond formation reaction of a nitrogen-containing aromatic compound with an arylzinc reagent takes place at 0 degrees C in a good to quantitative yield. The reaction involves a C-Hbondactivationdirected by a neighboring nitrogen atom. The important additives in this reaction are 1,10-phenanthroline, tetramethylethylenediamine, and 1,2-dichloro-2-methylpropane, in the absence
含氮芳族化合物与芳基锌试剂的铁催化 CC 键形成反应在 0 摄氏度下以良好的定量产率发生。该反应涉及由相邻氮原子引导的 CH 键活化。该反应中的重要添加剂是 1,10-菲咯啉、四甲基乙二胺和 1,2-二氯-2-甲基丙烷,在没有它们的情况下观察到非常低的产物收率。
Ligand-induced reactivity of β-diketiminate magnesium complexes for regioselective functionalization of fluoroarenes via C–H or C–F bond activations
作者:Laia Davin、Ross McLellan、Alan R. Kennedy、Eva Hevia
DOI:10.1039/c7cc07193k
日期:——
Using β-diketiminate Mg(II) complexes containing either alkyl, aryl or amide groups, the regioselectivefunctionalization of a wide range of fluoroarenes is accomplished but in uniquely different ways. Overcoming common limitations of traditional s-block bases, kinetically activated [(DippNacnac)Mg(TMP)] (1) deprotonates these molecules at room temperature, trapping sensitive fluoroaryl anions that