发现在腈亚胺和高度环应变的N N双键之间以光诱导的1,3-偶极环加成形式形成了亲极性。碳桥键合的八环偶氮苯(CBOA)的光异构化使其反式构型以非常快的速率(28 400 M -1 s -1)加速了连接反应。基于CBOA的光点击反应被证明是生物正交的。此外,NoxaB肽已被CBOA装订器成功交联,该装订器起着双重作用:光控制肽的构象和探针在活细胞中的光缀合。
Abstract An easy one-step synthesis of 3,4-diarylsydnones from 3-arylsydnones and arylboronic acids by Pd-catalyzed C–H bond activation is described. An easy one-step synthesis of 3,4-diarylsydnones from 3-arylsydnones and arylboronic acids by Pd-catalyzed C–H bond activation is described.
Direct Arylation of Sydnones with Aryl Chlorides toward Highly Substituted Pyrazoles
作者:Andrew W. Brown、Joseph P. A. Harrity
DOI:10.1021/acs.joc.5b00143
日期:2015.2.20
The direct arylation of the C4 position of both N-alkyl- and N-arylsydnones with aryl/heteroaryl chlorides has been realized. The reaction is quite general and allows access to a wide range of 4-substituted sydnones. Yields of more challenging substrates can be improved through the use of aryl bromides.