Reaction of 2-cyano-3-(4-oxo-4H-chromen-3-yl) prop-2-enamide with some phosphorus reagents: synthesis of some novel diethyl phosphonates, 1, 2, 3-diazaphosphinanes, 1, 2, 3-thiazaphosphinine and 1, 2-azaphospholes bearing a chromone ring.