Directed regioselective <i>ortho</i>,<i>ortho</i>′-magnesiations of aromatics and heterocycles using <i>s</i>Bu<sub>2</sub>Mg in toluene
作者:Andreas Hess、Jan P. Prohaska、Sabrina B. Doerrich、Florian Trauner、Ferdinand H. Lutter、Sébastien Lemaire、Simon Wagschal、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1039/d1sc01777b
日期:——
functionalized either by Pd-catalyzed arylation or by trapping reactions with a broad range of electrophiles (aldehydes, ketones, allylic halides, acyl chlorides, Weinreb amides, aryl halides, hydroxylamine benzoates, terminal alkynes). Furthermore, several double ortho,ortho′-magnesiations were realized in the case of aryl oxazolines, N-aryl pyrazoles as well as 2-aryl-2H-1,2,3-triazoles by simply repeating the
芳基唑类作为生物活性化合物是普遍存在的,其区域选择性功能化具有极其重要的合成意义。在这里,我们报告了可溶于甲苯的二烷基镁基s Bu 2 Mg的开发。这种新试剂可以对各种N-芳基化吡唑和 1,2,3-三唑以及带有恶唑啉、磷酸二酰胺或酰胺导向基团的芳烃进行温和的区域选择性邻位镁化。所得二芳基镁试剂通过 Pd 催化的芳基化或通过与多种亲电子试剂(醛、酮、烯丙基卤、酰氯、Weinreb 酰胺、芳基卤、苯甲酸羟胺、末端炔)的捕获反应进一步官能化。此外,在芳基恶唑啉、N-芳基吡唑以及2-芳基-2H -1,2,3-三唑的情况下,通过简单地重复镁化/亲电试剂捕获序列,实现了几种双邻位、邻'-镁化,从而允许有价值的1,2,3-功能化芳烃的制备。