4.  A Convenient Method for the Synthesis of Bis-Ureas Using Bis(O-Nitrophenyl) Carbonate as Starting Material

Authors: M.C. Turoczi, M. Simon, C. Csunderlik


Abstract:

A general method for the preparation of bis-ureas from bis(o-nitrophenyl)carbonate have been developed. Directional urea synthesis is achieved by sequential amine addtition to bis(o-nitrophenyl)carbonate in two steps: as a first step bis(o-nitrophenil) carbonate is reacted with benzyl amine to form benzyl-o-nitrophenyl carbamate; in the second step the carbamate is reacted with a variety of diamines in toluen to yield bis-ureas.


Keywords: bis(o-nitrophenyl) carbonate, carbamate, bis-urea

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