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.
Synthesis of 2-Keto(hetero)aryl Benzox(thio)azoles through Base Promoted Cyclization of 2-Amino(thio)phenols with α,α-Dihaloketones
作者:Jun Jiang、Huaxu Zou、Qizhi Dong、Ruijia Wang、Linghui Lu、Yonggang Zhu、Weimin He
DOI:10.1021/acs.joc.5b02093
日期:2016.1.4
An interesting base-promoted protocol for the synthesis of 2-keto(hetero)aryl benzox(thi)azoles has been developed. Starting from commercially available 2-amino(thio)phenols and alpha,alpha-dihaloketones, moderate to good yields of the corresponding heterocycles can be achieved. Notably, only EtNH2 was required as the promoter here, and the reaction can be easily performed on a large scale.