Base- and Additive-Free Ir-Catalyzed <i>ortho</i>-Iodination of Benzoic Acids: Scope and Mechanistic Investigations
作者:Elis Erbing、Amparo Sanz-Marco、Ana Vázquez-Romero、Jesper Malmberg、Magnus J. Johansson、Enrique Gómez-Bengoa、Belén Martín-Matute
DOI:10.1021/acscatal.7b02987
日期:2018.2.2
A protocol for the C–H activation/iodination of benzoic acids catalyzed by a simple iridium complex has been developed. The method described in this paper allows the ortho-selective iodination of a variety of benzoic acids under extraordinarily mild conditions in the absence of any additive or base in 1,1,1,3,3,3-hexafluoroisopropanol as the solvent. The iridium catalyst used tolerates air and moisture
已经开发了一种由简单铱络合物催化的苯甲酸的C–H活化/碘化的方案。本文描述的方法允许在非常温和的条件下,在没有任何添加剂或碱的情况下,在1,1,1,3,3,3-六氟异丙醇作为溶剂中对多种苯甲酸进行邻位碘化。所用的铱催化剂可耐受空气和湿气,并选择性地以高转化率得到邻碘苯甲酸。机理研究表明,Ir(III)/ Ir(V)催化循环起作用,并且HFIP的独特性质使得能够使用羧基作为引导基团进行C-H碘化。