Carbamic acid 2-trimethylsilylethyl ester (Teoc-NH2) serves as an ammoniaequivalent in the palladium-catalyzed amination of aryl bromides and aryl chlorides. Anilines with sensitive functional groups can be readily prepared using these amine derivatives.
The direct conversion of carbamates to ureas using aluminum amides
作者:Sang-Hyuep Lee、Hana Matsushita、Bruce Clapham、Kim D Janda
DOI:10.1016/j.tet.2004.02.034
日期:2004.4
The conversion of carbamates into ureas using aluminum amide complexes is reported. This reaction is a convenient method to prepare bi-, tri- and tetra-substituted ureas from carbamate-protected primary or secondary amines by reaction with primary or secondary amines in the presence of stoichometric quantities of trimethylaluminum. A reactivity trend of the various carbamates was observed and methyl and benzyl carbamates were reacted selectively in the presence of t-butyl carbamates. (C) 2004 Elsevier Ltd. All rights reserved.
CAPSON, T. L.;POULTER, C. D., TETRAHEDRON LETT., 1984, 25, N 33, 3515-3518