3-Cyanoallyl boronates are versatile building blocks in the synthesis of polysubstituted thiophenes

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Abstract

We report the preparation of hitherto unprecedented 3-cyanoallyl boronates using condensation of the parent α-boryl aldehyde and nitriles. The resulting allyl boronates have been used to generate a wide range of borylated thiophenes, which represent a valuable class of heterocycles in modern drug discovery. Subsequent Suzuki-Miyaura cross-coupling enabled the synthesis of pharmaceutically important 3,5-disubstituted aminothiophenes. Moreover, late stage functionalization gave access to borylated bromothiophene and thieno[2,3-b]pyridines.

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Shao, W., Kaldas, S. J., & Yudin, A. K. (2017). 3-Cyanoallyl boronates are versatile building blocks in the synthesis of polysubstituted thiophenes. Chemical Science, 8(6), 4431–4436. https://doi.org/10.1039/c7sc00831g

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