Aminolysis of <i>O</i>-Aryl Thionobenzoates: Amine Basicity Combines with Modulation of the Nature of Substituents in the Leaving Group and Thionobenzoate Moiety to Control the Reaction Mechanism
nucleophile and nucleofuge, that is, the reaction proceeds through T(+/-) when the leaving aryloxide is less basic than the attacking amine, but through T(+/-) and T(-) when the leaving group is more basic than the amine. However, the reaction mechanism is not influenced by the electronic nature of the substituent X in the nonleavinggroup. The Hammett plot for the reactions of 2a-f with benzylamine is
An efficient iodine-mediated multipathway coupled domino reaction has been developed for the synthesis of thiobenzamides from benzylamines, benzylamines/aldehydes, and N-alkyl benzylamines under the same reaction conditions. This approach combines two consecutive domino processes in one pot using iodine as the oxidant.
Europhtal: An industrial cobalt phthalocyanine complex as the efficient catalyst for synthesis of thioamides by one‐pot reaction of mercaptans and amines
The potential of industrial cobaltphthalocyanines in the synthesis of thioamides is reported. A mixture of an industrial sulfonated cobaltphthalocyanines known as Co[(SO3Na)2,3Pc] (Europhtal catalyst additive 8020) is introduced as an efficient catalyst capable of converting benzyl thiols to synthetically valuable thioamides by reaction with amines and DMSO. In this procedure, different primary and
selective, efficient, and simple method for direct transamidation of thioamides with amines, promoted by commercially available acetophenone under metal-/solvent-free conditions. The reaction tolerated a wide range of functional groups and substrates, including single- or double-thioamides, benzylamines, or alkyl/cycloalkyl-substituted aliphatic amines. The present protocol can be applied to gram-scale in
作者:Alan R. Katritzky、Rachel M. Witek、Valerie Rodriguez-Garcia、Prabhu P. Mohapatra、James W. Rogers、Janet Cusido、Ashraf A. A. Abdel-Fattah、Peter J. Steel
DOI:10.1021/jo050670t
日期:2005.9.1
Benzotriazole reagents for thioacylation (RCSBt), thiocarbamoylation (RR'NCSBt), aryl/alkoxythioacylation (ROCSBt), and aryl/alkylthiothioacylation (RSCSBt) are synthesized, and their utility is assessed by syntheses of representative heteroaryl thioureas 3a-g, thioamides 15a-s, thionoesters 16a-h, thiocarbamates 17a-e, dithiocarbamates 18a-d, thiocarbonates 19a-c, and dithiocarbonates 20a-c.