The reaction between benzyl amines, triethyl orthoformate, and diethyl phosphite affords either bisphosphonic (compound 1) or N-benzylaminobenzylphosphonic (compound 2) acid depending on the reaction conditions. The final output of the reaction can be manipulated by the choice of reaction conditions, particularly the molar ratio of substrates.
Keywords: N-benzylaminobenzylphosphonates; N-benzylaminomethylenebisphosphonic acid; aminophosphonates; bisphosphonates; multicomponent reactions; synthesis of C-P bond.