Abstract
We have designed novel 1,2,3-diazaphosphole, 1,5,2-diazaphosphinine and 1,5,2-diazaphosphepine compounds containing a coumarin ring. The method depended on one-pot, three-component reaction of 3-(2-bromoacetyl)-2H-chromen-2-one (1) and diethyl phosphite in the presence of diamine reagent under ultrasonication effect at 50 degrees C. The possible reaction mechanisms of the formation of these products were displayed and discussed. The structures of isolated products were established by elemental analyses and spectral tools.