polystyrene-supported p-toluenesulfonic acid (PS/PTSA) and the synthesis of α-aminophosphonates from the Kabachnik–Fields (KF) reaction undermicrowaveirradiation in solvent-free conditions. Recently, the catalytic activity of PS/PTSA was tested with good yields. This procedure is the simplest, most straightforward, environment friendly method for the synthesis of α-aminophosphonates from simple to different substituted