期刊
TETRAHEDRON LETTERS
卷 41, 期 11, 页码 1707-1710出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(00)00018-6
关键词
palladium; palladium compounds; catalysis; coupling reactions; thiazoles
The difunctional substrate 2,4-dibromothiazole 2 was transformed into the title compounds 1 by consecutive Pd(0)-catalyzed cross-coupling reactions. Aryl zinc reagents which were prepared by ortho-lithiation of compounds 3 and subsequent transmetalation were used as carbon nucleophiles in the first coupling reaction. By this means, an aryl substituent was attached to the 2-position (50-62% yield). A succeeding cross-coupling with arylboronic acids 4 occurred at the 4-position of the intermediate 4-bromothiazoles 5 (76-97% yield). (C) 2000 Elsevier Science Ltd. All rights reserved.
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