(Chemical Equation Presented) It adds up to 4! Thiophenes and thiazoles can be arylated in the 4- rather than the expected 5-position in a new C-H functionalization reaction (see scheme; TEMPO: 2,2,6,6-tetramethylpiperidine-N- oxyl). The boronic acid proved to be the key to achieving the otherwise difficult C4 selectivity. The method was applied to a concise synthesis of a key pharmacological structure with potential for treatment of Alzheimers disease. © 2011 Wiley-VCH Verlag GmbH & Co. KGaA.
CITATION STYLE
Kirchberg, S., Tani, S., Ueda, K., Yamaguchi, J., Studer, A., & Itami, K. (2011). Oxidative biaryl coupling of thiophenes and thiazoles with arylboronic acids through palladium catalysis: Otherwise difficult C4-selective C-H arylation enabled by boronic acids. Angewandte Chemie - International Edition, 50(10), 2387–2391. https://doi.org/10.1002/anie.201007060
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