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Oxidative Biaryl Coupling of Thiophenes and Thiazoles with Arylboronic Acids through Palladium Catalysis: Otherwise Difficult C4-Selective C

S. Kirchberg, S. Tani, K. Ueda, J. Yamaguchi, A. Studer, K. Itami, Angew. Chem. Int. Ed2011, Early View. DOI: 10.1002/anie.201007060 

It adds up to 4!

Thiophenes and thiazoles can be arylated in the 4- rather than the expected 5-position in a new CH 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 Alzheimer’s disease.

 

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