Direct C-2 Acylation of Thiazoles with Aldehydes via Metal- and Solvent-Free C–H Activation in the Presence of tert-Butyl Hydroperoxide
作者:Bhalchandra Bhanage、Ashok Khemnar
DOI:10.1055/s-0033-1340068
日期:——
activation of aldehydes and thiazoles is developed. The reaction occurs smoothly, under metal-, acid- and solvent-free conditions usingtert-butylhydroperoxide as the oxidant under an air atmosphere, to afford a wide range of heteroaryl ketones in moderate to good yields. The sp2 C–H bonds in the aldehyde and thiazole undergo directoxidativecross-coupling, resulting in C-2 acylation of the azole
Reactions of 2-acylthiazolium salts with N-arylhydroxylamines
作者:Luísa M Ferreira、Ana M Lobo、Sundaresan Prabhakar、Antonieta C Teixeira
DOI:10.1016/s0040-4020(98)01161-2
日期:1999.3
2-Acylthiazolium salts, easily obtained by alkylation of the corresponding 2-acylthiazoles with methyl triflate, react with N-arylhydroxylamines to furnish the O-acyl derivatives of relevance in the induction of cancer by aromatic amines. (C) 1999 Elsevier Science Ltd. All rights reserved.
Organocatalytic C–H Bond Arylation of Aldehydes to Bis-heteroaryl Ketones
作者:Qiao Yan Toh、Andrew McNally、Silvia Vera、Nico Erdmann、Matthew J. Gaunt
DOI:10.1021/ja400051d
日期:2013.3.13
An organocatalytic aldehyde C-H bond arylation process for the synthesis of complex heteroaryl ketones has been developed. By exploiting the inherent electrophilicity of diaryliodonium salts, we have found that a commercial N-heterocyclic carbene catalyst promotes the union of heteroaryl aldehydes and these heteroaromatic electrophile equivalents in good yields. This straightforward catalytic protocol offers access to ketones bearing a diverse array of arene and heteroarene substituents that can subsequently be converted into molecules displaying structural motifs commonly found in medicinal agents.