Synthesis of Symmetrical and Unsymmetrical Ureas Using Unsymmetrical Diaryl Carbonates
作者:Richard Freer、Alexander McKillop
DOI:10.1080/00397919608003622
日期:1996.1
Abstract Appropriately substituted unsymmetrical diaryl carbonates react smoothly with primary amines to give the carbamates derived by nucleophilic displacement of the less electron rich aromatic substituent. Subsequent treatment of the carbamates with primary and secondary amines gives either symmetrical or unsymmetricalureas in excellent yield and the overall process can be carried out as a “one