Metal-free tandem reactions of 2-iodoaryl ynones with sodium azide for the synthesis of benzoisoxazole containing 1,2,3-triazoles
作者:Kashif Majeed、Fengtao Zhou、Qiuyu Zhang
DOI:10.1039/d0ob02608e
日期:——
A metal-free approach has been developed for the synthesis of benzo[c]isoxazole (anthranils) containing 1,2,3-triazoles. The reaction proceeded efficiently through a [3 + 2] azide–alkyne cycloaddition, SNAr azidation and denitrogenative cyclization sequence. The metal-free protocol enabled effective construction of one N–O and three C–N bonds in one pot. In addition, the synthetic utility of the current
已开发出一种无金属方法来合成含有 1,2,3-三唑的苯并[ c ]异恶唑(邻氨基苯甲酸酯)。该反应通过 [3 + 2] 叠氮化物-炔烃环加成、S N Ar 叠氮化和脱氮环化序列有效地进行。无金属协议能够在一锅中有效地构建一个 N-O 和三个 C-N 键。此外,通过对所得产品进行后期修改,进一步证明了当前方法的合成效用。
Synthesis of 2,1-Benzoisoxazole-Containing 1,2,3-Triazoles through Copper-Catalyzed Three-Component Domino Reactions of <i>o</i>-Bromoacetophenones, Aldehydes, and Sodium Azide
We herein describe an efficient copper-catalyzed three-component domino protocol used to prepare 2,1-benzoisoxazole-containing 1,2,3-triazoles from commercially available o-bromoacetophenones, aldehydes, and sodium azide. This domino process involves Aldol condensation, copper-catalyzed azide-chalcone oxidative cyclization, 1,2,3-triazole-assisted azidation, and denitrogenative cyclization sequences