Visible-Light Photocatalytic Functionalization of Isocyanides for the Synthesis of Secondary Amides and Ketene Aminals
作者:Rolando Cannalire、Jussara Amato、Vincenzo Summa、Ettore Novellino、Gian Cesare Tron、Mariateresa Giustiniano
DOI:10.1021/acs.joc.0c01946
日期:2020.11.6
photocatalytic protocol enabling the formation of secondary amides from electron-poor organic bromides and isocyanides was developed. In addition, the in situ interception of ketenimine intermediates with nitrogen nucleophiles such as amines, hydrazines, and TMSN3 afforded, in a one-pot two-step procedure, valuable scaffolds such as ketene aminals, pyrazolones, and tetrazoles. Mechanistic evidence confirmed
开发了一种新的可见光诱导的光催化方案,该方案能够从贫电子的有机溴化物和异氰酸酯中形成仲酰胺。另外,通过一锅两步程序,用氮亲核试剂(如胺,肼和TMSN 3)原位截获酮亚胺中间体,可提供有价值的骨架,如乙烯酮缩醛,吡唑啉酮和四唑。机理证据证实了一种自由基途径,其中异氰酸酯充当自由基双生子受体,产生关键的亚氨基自由基基团。