Abstract An efficient, simple, and environmentally friendly synthesis of a series of chromeno[2,3-d]pyrimidine-trione derivatives has been accomplished via the three-component reaction of a barbituric acid, dimedone/cyclohexane-1,3-dione, and aromatic aldehydes using Sc(OTf)3 as a recyclable catalyst undersolvent-free condition. This method exploits the use of Sc(OTf)3 as a Lewisacid catalyst in