A simple and efficient synthesis of N-benzoyl ureas
摘要:
A novel, operationally simple, method for the preparation of acyl ureas is described. The procedure is high yielding and tolerant of a wide range of functional groups. (C) 2012 Elsevier Ltd. All rights reserved.
Activation of carboxylic acids by Burgess reagent: an efficient route to acyl ureas and amides
作者:Derek Wodka、Michael Robbins、Ping Lan、Rogelio L. Martinez、John Athanasopoulos、Gergely M. Makara
DOI:10.1016/j.tetlet.2006.01.015
日期:2006.3
Carboxylic acids upon treatment with Burgess reagent are converted to novel mixed sulfocarboxy anhydrides. Subsequent treatment of such mixed anhydrides with amines at elevated temperatures yields acyl ureas and amides. The ratio of the two products appears to be temperature controlled. The method provides a simple and convenient route to diverse acyl ureas starting from carboxylic acids and amines
provides facile access to acyl ureas. In addition, a mechanistic study was carried out by both experiment and DFT calculation. Control experiments and kinetic study revealed that the real activepalladiumspecies were Pd(0). The result of kinetic study suggested that palladium catalyst, azide, and CO were all involved in the turnover-limiting step except for amine. Further DFT study suggested that an