An Efficient Approach to Diazaspiro [5.5] undecane -1, 5,9-trione Derivatives under Ultrasound Irradiation

Asimple and cfficient mcthod for the symhesis of 2,4-dioxa-8,10 -diazaspiro [5.5] undecane ,-1, 5,9-trione .derivatives via a one-pot .and three component condensation reaction of, barbituric acid or meldrum s acid aromatic aldehyde .and urea using p-toluencsulfonic,acid as inexpehsive and available catalyst under ultrasound irradiation is described. Good yields the simple experimental procedure, and short reaction time are advantages of this, new method.