Synthesis 2008(9): 1359-1366  
DOI: 10.1055/s-2008-1042946
PAPER
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Symmetrical and Unsymmetrical N-Aryl-Substituted Cyclic Ureas through Copper(I) Iodide Catalyzed Goldberg-Buchwald-Nandakumar C-N Coupling Reactions

Chung-Chieh Leea, Po-Shih Wanga, M. Balaji Viswanatha, Man-kit Leung*a,b
a Department of Chemistry, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei, Taiwan 106
b Institute of Polymer Science and Engineering, National Taiwan University, 1 Roosevelt Road, Section 4, Taipei, Taiwan 106
Fax: +886(2)33636359; e-Mail: mkleung@ntu.edu.tw;
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Publikationsverlauf

Received 10 December 2007
Publikationsdatum:
18. März 2008 (online)

Abstract

The catalytic conditions of copper(I) iodide/potassium carbonate/trans-N,N′-dimethylcyclohexane-1,2-diamine, either in toluene at reflux temperature, or by heating neat at 150 °C effectively promoted the C-N coupling of aryl bromides with cyclic ureas. By employing a protection-deprotection strategy, unsymmetrical diaryl-substituted cyclic ureas could also be synthesized.

20

While DMF is a teratogen, dioxane is a carcinogen suspect agent.