[(<i>t</i>Bu<sub>2</sub>PhP)Ag(μ-OCF<sub>3</sub>)]<sub>2</sub>: A Thermally Stable, Light-Insensitive Nucleophilic Reagent for Trifluoromethoxylation
作者:Daoqian Chen、Yongrui Luo、Long Lu、Qilong Shen
DOI:10.1021/acs.organomet.4c00073
日期:——
variety of alkyl electrophiles including benzyl bromodes/chlorides, primary alkyl bromides/iodides/triflates/nosylates, and secondary alkyl bromides/triflates/nosylates in good to excellent yields. Mechanistic investigation by reaction with three enantioenriched secondary alkyl electrophiles suggested that these reactions proceed via an SN2 pathway, which is consistent with our original mechanistic hypothesis
许多三氟甲氧基化方法经常提出亲核 AgOCF 3作为关键中间体。然而,这种中间体的结构仍然难以捉摸。在此,制备了热稳定、光不敏感的亲核三氟甲氧基化试剂[Ag(PPh t Bu 2 )(OCF 3 )] ( 1 )并进行了充分表征。试剂1与多种烷基亲电子试剂反应,包括苄基溴/氯化物、伯烷基溴/碘化物/三氟甲磺酸酯/对硝基苯磺酸酯和仲烷基溴化物/三氟甲磺酸酯/对硝基苯磺酸酯,产率良好至优异。通过与三种对映体富集的二级烷基亲电子试剂反应进行的机理研究表明,这些反应通过 S N 2 途径进行,这与我们最初的机理假设一致。