Electrochemical Oxidative Phosphorylations of Glycine Derivatives with R<sub>2</sub>P(O)−H‐Containing Compounds via C(<i>sp</i><sup>3</sup>)−H Functionalisation
Ruige Wang, Jie Wang, Yonghong Zhang, Bin Wang, Yu Xia, Fei Xue, Weiwei Jin, Chenjiang Liu
Abstract
Herein, we report the development of transition-metal-catalyst- and external-oxidant-free electrochemical cross-coupling hydrogen-evolution chemistry involving glycine amides and diarylphosphine oxides. A broad range of biologically active α-aminophosphonates was obtained in moderate to good yields in a clean and sustainable manner. Moreover, the TBAB (tetrabutylammonium bromide) electrolyte was recycled four times without obvious loss of reaction activity. Moreover, this protocol was performed on the gram scale under slightly modified electrolytic conditions or in combination with continuous flow microreactor technology. Control experiments were used to disclose a possible free-radical mechanism.