One-pot and novel route for the synthesis of 4-substituted-1,2,4- triazolidine-3,5-diones

The efficient and one-pot synthesis of 4-substituted-1,2,4-triazolidin-3,5-dione derivatives (4- substituted urazoles) via combination of triphosgene, substituted anilines, and ethyl carbazate in the presence of cesium carbonate is presented.

Urazole Triphosgene Aniline Ethyl carbazate Cesium carbonate