57193-24-5Relevant articles and documents
IrIII-Catalyzed Selective ortho-Monoiodination of Benzoic Acids with Unbiased C?H Bonds
Weis, Erik,Johansson, Magnus J.,Martín-Matute, Belén
supporting information, p. 10185 - 10190 (2020/07/31)
An iridium-catalyzed selective ortho-monoiodination of benzoic acids 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 reaction is performed at room temperature and no inert atmosphere or exclusion of moisture is required. Mechanistic investigations revealed a substrate-dependent reversible C?H activation/protodemetalation step, a substrate-dependent turnover-limiting step, and the crucial role of the AgI additive in the deactivation of the iodination product towards further reaction.
Switchable C?H Alkylation of Aromatic Acids with Maleimides in Water: Carboxyl as a Diverse Directing Group
Pu, Fan,Liu, Zhong-Wen,Zhang, Lin-Yan,Fan, Juan,Shi, Xian-Ying
, p. 4116 - 4122 (2019/09/12)
A ruthenium-catalyzed protocol to access conjugate addition or decarboxylative conjugate addition of aromatic acids with maleimides has been developed. The reaction shows interesting chemoselectivity with different substituted benzoic acids. The reaction pathway of C?H alkylation is controlled by the intrinsic property of aromatic acids but not reaction conditions. Under almost the same reaction conditions, carboxyl can act as either a classical directing group or a traceless directing group, thereby generating two kinds of products, i. e., 2-alkyl substituted benzoic acids and alkyl substituted benzenes. These two reactions proceeded under mild and redox-neutral conditions in neat water under the atmosphere of air, and could be easily scaled up to grams. The decarboxylative conjugate addition, where carboxyl acts as a traceless directing group, can be realized without the addition of any ligand, silver or copper salt.
Palladium-Catalyzed H/D Exchange Reaction with 8-Aminoquinoline as the Directing Group: Access to ortho-Selective Deuterated Aromatic Acids and β-Selective Deuterated Aliphatic Acids
Zhao, Donghong,Luo, Haofan,Chen, Binhui,Chen, Wenteng,Zhang, Guolin,Yu, Yongping
, p. 7860 - 7866 (2018/07/21)
We develop a palladium-catalyzed H/D exchange reaction with 8-aminoquinoline as the directing group as well as D2O as the source of deuterium atom and solvent. This reaction achieves selectively H/D exchange at the ortho-C-H of aromatic amides and the β-C-H of aliphatic amide. Ortho-deuterated aromatic acids and β-deuterated aliphatic acids are obtained by removal of the directing group. And a possible mechanism is also proposed.
