Pd<sup>II</sup>‐Catalyzed Monoselective<i>ortho</i>Halogenation of CH Bonds Assisted by Counter Cations: A Complementary Method to Directed<i>ortho</i> Lithiation
were evaluated as catalysts for the oxidation of benzhydrol to benzophenone in the presence of Oxone® (2KHSO5·KHSO4·K2SO4) as a co-oxidant at room temperature. A study on the substituent effect of the benzene ring of N-isopropyl-2-iodobenzamide on the oxidation revealed that its reactivity increased in the following order of substitution: 5-NO2 < 5-CO2Me, 3-OMe < 5-OAc < 5-Cl < H, 4-OMe < 5-Me < 5-OMe
Ir
<sup>III</sup>
‐Catalyzed Selective
<i>ortho</i>
‐Monoiodination of Benzoic Acids with Unbiased C−H Bonds
作者:Erik Weis、Magnus J. Johansson、Belén Martín‐Matute
DOI:10.1002/chem.202002204
日期:2020.8.12
An iridium‐catalyzed selective ortho‐monoiodination of benzoicacids with two equivalent C−H bonds is presented. A wide range of electron‐rich and electron‐poor substrates undergo the reaction under mild conditions, with >20:1 mono/di selectivity. Importantly, the C−H iodination occurs selectively ortho to the carboxylic acid moiety in substrates bearing competing coordinating directing groups. The