Several fluorophenyl azides were photolyzed with aniline at room temperature. Only pentafluoro and 2,6-difluorophenyl azides gave asymmetrical fluoroazobenzenes as the major products. These products were generated by singlet NH insertion reaction with aniline followed by oxidation of the resulting aromatic hydrazine.
A detailed mechanism study on the anion ligand promoted selective C–H bond fluorination is reported. The role of the anion ligand has been clarified by experimentalevidence and DFT calculations. Moreover, the nitrate promoted C–F bond reductive elimination enabled a selective C–H bond fluorination of various symmetric and asymmetric azobenzenes to access diverse o-fluoroanilines.
Exhaustive Catalytic <i>ortho</i>-Alkoxylation of Azobenzenes: Flexible Access to Functionally Diverse Yellow-Light-Responsive Photoswitches
作者:Adrian Müller-Deku、Oliver Thorn-Seshold
DOI:10.1021/acs.joc.2c02214
日期:2022.12.16
exhaustive ortho-alkoxylation of azobenzenephotoswitches. Alkoxylation is known to improve the photoswitch properties that control azobenzenes’ success in chemical biology or materials sciences, e.g., better completeness of both E → Z and Z → E photoisomerizations and >100 nm red shift of photoresponse. Our method enables straightforward late-stage diversification of photoswitches with interesting functional