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
在好氧条件和可见光照射下,使用DDQ作为光催化剂和BocNH2作为胺源,实现了苯衍生物的CH胺化反应。缺电子和富电子的苯作为底物反应,具有中等至良好的产品收率。反应的胺范围包括Boc-胺,氨基甲酸酯,吡唑,磺酰亚胺和脲。初步的机理研究表明,芳烃被DDQ的三重态氧化为具有不同亲电性的自由基阳离子,并且胺和DDQ之间的电荷转移络合物作为反应的中间产物。