Copper-Catalyzed Cascade Cyclization of Arylsulfonylhydrazones Derived from <i>ortho</i>-Alkynyl Arylketones: Regioselective Synthesis of Functionalized Cinnolines
作者:Biao Yao、Tao Miao、Wei Wei、Pinhua Li、Lei Wang
DOI:10.1021/acs.orglett.9b03134
日期:2019.12.6
A novel copper-catalyzed cascade reaction of arylsulfonylhydrazones derived from ortho-alkynyl arylketones was accomplished. This reaction provides concise access to diversified cinnolines in good yields. The mechanistic investigations have disclosed involvement of the key alkynyl amination, 1,4-aryl migration, desulfonylation, and diazo radical cyclization cascade in the transformation.
完成了一种新的铜催化的衍生自邻炔基芳基酮的芳基磺酰基cascade的级联反应。该反应以高收率提供了对各种肉桂酸的简捷途径。机理研究表明,关键的炔基胺化,1,4-芳基迁移,脱磺酰化和重氮自由基环化级联反应参与了转化过程。