A practical method for the synthesis of carbamates from ureas and organic carbonates was developed with 100% atom economy using La2O3/SiO2 as catalyst without any additional solvent. The scope of the protocol is demonstrated in the synthesis of 14 carbamates with various functional groups in excellent yields (76–95%).

Keywords Atom economy; carbamates; carbonates; clean synthesis; lanthana; urea derivatives

Guo XG,Shang JP,Li J,et al. Green And Practical Synthesis Of Carbamates From Ureas And Organic Carbonates[J]. Synthetic Communications,2011,41:1102-1111.