methanol–water. The wide scope and simple set-up and work-up procedures of the reported method allow the synthesis of a diverse set of α-aminophosphonic acids possessing two different functional groups. A total of 20 α-aminophosphonic acids are synthesized in 73–89% yields via a one-pot, three-step procedure involving chlorotrimethylsilane-promoted condensation of carbonyl compounds and primary amines yielding