Practical Synthesis of Unsymmetrical Ureas from Isopropenyl Carbamates Isabelle Gallou Magnus Eriksson Xingzhong Zeng Chris Senanayake Vittorio Farina 10.1021/jo0507643.s001 https://acs.figshare.com/articles/journal_contribution/Practical_Synthesis_of_Unsymmetrical_Ureas_from_Isopropenyl_Carbamates/3271996 A very convenient method for the synthesis of unsymmetrical ureas is described, based on isopropenyl carbamates. The synthetic efficiency of traditional methods for urea formation, such as use of phosgene or alkyl and aryl carbamates, is limited by the formation of symmetrical urea side products or reaction reversibility. Isopropenyl carbamates react with amines cleanly and irreversibly and give unsymmetrical ureas in high yield and purity. This method is ideal for the rapid synthesis of compound libraries. 2005-08-19 00:00:00 urea side products carbamate method synthesis formation Isopropenyl unsymmetrical ureas