Cu‐Catalyzed Cyanation of Arylboronic Acids with Acetonitrile: A Dual Role of TEMPO |
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Authors: | Yamin Zhu Linyi Li Prof?Dr Zengming Shen |
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Institution: | School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800?Dongchuan Road, Shanghai, 200240 (P.R. China), Fax: (+86)?21‐54741297 |
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Abstract: | The cyanation of arylboronic acids by using acetonitrile as the “CN” source has been achieved under a Cu(cat.)/TEMPO system (TEMPO=2,2,6,6‐tetramethylpiperidine N‐oxide). The broad substrate scope includes a variety of electron‐rich and electron‐poor arylboronic acids, which react well to give the cyanated products in high to excellent yields. Mechanistic studies reveal that TEMPO?CH2CN, generated in situ, is an active cyanating reagent, and shows high reactivity for the formation of the CN? moiety. Moreover, TEMPO acts as a cheap oxidant to enable the reaction to be catalytic in copper. |
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Keywords: | arylboronic acid C C activation copper cyanides TEMPO |
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