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
N-benzoylated carbazole derivatives were investigated. It was found that the bulky t-butyl and iodo groups restricted rotation about the N–C7′ and C7′–C1′ bonds to separate four stereoisomers, in which rotation about the C7′–C1′ bond was in perfect concert with rotation about the N–C7′ bond. The relation of the rotation of the N–C7′ and C7′–C1′ axes was investigated by comparing the stereochemistry of