One-pot and novel route for the synthesis of 4-substituted-1,2,4-triazolidine-3,5-diones
摘要:
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. (C) 2013 Arash Ghorbani-Choghamarani. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
The perishable nature of 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD) in aqueous medium is always considered as a side-effect. The rapid color fading of PTAD inspired us to explore the mechanism of its hydrolysis. Herein, photogenerated nitrile imine is discovered to be an ultra-fast trapping agent to “click” with a ring-opening hydrolysate with an umpolung effect, which resulted in an unprecedented