期刊
TETRAHEDRON LETTERS
卷 42, 期 26, 页码 4381-4384出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(01)00716-X
关键词
palladium and compounds; catalysis; aryl halides; arylation; ureas
A new method for the palladium-catalyzed arylation of ureas is described. The coupling reaction of urea and phenylurea with aryl halides containing electron-withdrawing groups in the p-position in dioxane in the presence of 0.5-1.0 mol% of Pd(2)dba(2). CHCl3, Xantphos and Cs2CO3 as a base gives N,N'-diarylureas in yields of 64-92%. (C) 2001 Elsevier Science Ltd. All rights reserved.
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