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DOI: 10.1055/s-0030-1258373
2,4-Disubstituted Thiazoles by Regioselective Cross-Coupling or Bromine-Magnesium Exchange Reactions of 2,4-Dibromothiazole
Publication History
Publication Date:
20 December 2010 (online)
Abstract
Cross-coupling reactions occur on 2,4-dibromothiazole preferentially at the more electron-deficient 2-position. This fact can be favorably used to prepare 2-substituted 4-bromothiazoles, which serve as precursors for 2,4-disubstituted thiazoles. Protocols for regioselective Negishi and Stille cross-coupling reactions are provided. Alternatively, the title compound can be metalated in 2-position by a halogen-metal exchange reaction. As a supplement to the well-established bromine-lithium exchange, the regioselective bromine-magnesium exchange reaction is presented.
Key words
catalysis - cross-coupling - heterocycles - palladium - regioselectivity - thiazoles
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References
Current address: Georg-Simon-Ohm Hochschule, Fakultät für Angewandte Chemie, Prinzregentenufer 47, 90489 Nürnberg, Germany.
2Current address: Pharmazell GmbH, Rosenheimer Straße 43, 83064 Raubling, Germany.
3Current address: Boehringer Ingelheim Pharma GmbH & Co. KG, Binger Straße 173, 55216 Ingelheim, Germany.