A Pd‐catalyzedSuzuki cross‐coupling of arylboronicacids with Yagupolskii–Umemoto reagents was explored. In contrary to trifluoromethylations, the Pd‐catalyzedreaction of R−B(OH)2 and [Ar2SCF3]+[OTf]− provided the arylation products (R−Ar) in good to high yields. The reaction confirms that the S−Ar bonds of [Ar2SCF3]+[OTf]− can be readily cleaved in the presence of Pd complexes. The relatively electron‐poor
Cation Radical-Accelerated Nucleophilic Aromatic Substitution for Amination of Alkoxyarenes
作者:Nicholas J. Venditto、David A. Nicewicz
DOI:10.1021/acs.orglett.0c01621
日期:2020.6.19
Nucleophilic aromaticsubstitution (SNAr) is a common method for arene functionalization; however, reactions of this type are typically limited to electron-deficient aromatic halides. Herein, we describe a mild, metal-free, cation-radical accelerated nucleophilic aromaticsubstitution (CRA-SNAr) using a potent, highly oxidizing acridinium photoredox catalyst. Selectivesubstitution of arene C–O bonds
亲核芳香取代(S Ñ AR)是芳烃官能化的常用方法; 然而,这种类型的反应通常限于缺乏电子的芳族卤化物。在此,我们描述了一个温和的,无金属的,阳离子自由基加速亲核芳香取代(CRA-S ñ使用一种强效,高氧化性的吖啶photoredox催化剂的Ar)。各种芳族伯亲核试剂显示出芳烃醚基在多种芳基醚上的选择性取代。还提供了支持所提出的CRA-S N Ar途径的机理证据。