Teaching Old Compounds New Tricks: DDQ-Photocatalyzed C−H Amination of Arenes with Carbamates, Urea, and N-Heterocycles
作者:Somnath Das、Palani Natarajan、Burkhard König
DOI:10.1002/chem.201705442
日期:2017.12.22
The C-H amination of benzene derivatives was achieved using DDQ as photocatalyst and BocNH2 as the amine source under aerobic conditions and visible light irradiation. Electron-deficient and electron-rich benzenes react as substrates with moderate to good product yields. The amine scope of the reaction comprises Boc-amine, carbamates, pyrazoles, sulfonimides and urea. Preliminary mechanistic investigations
Highly<i>ortho</i>-Selective Chlorination of Anilines Using a Secondary Ammonium Salt Organocatalyst
作者:Xiaodong Xiong、Ying-Yeung Yeung
DOI:10.1002/anie.201607388
日期:2016.12.23
An organocatalytic, highly facile, efficient, and regioselective ortho‐chlorination of anilines is described. A secondary ammonium chloride salt has been employed as the catalyst and the reaction can be conducted at room temperature without protection from air and moisture. In addition, the reaction is readily scalable and the catalyst can be recycled and reused. This catalytic protocol has been applied