Metal-free direct C–H phosphonation of N-heterocycles with diphenylphosphine oxides under mild conditions

Herein, metal-free phosphonation of N-heterocycles with diphenylphosphine oxides, promoted by 1,5-diazabicyclo[5,4,0]undec-5-ene utilizing air as a green oxidant in dimethyl carbonate as an eco-friendly solvent at room temperature, is presented.