Visible‐Light‐Induced Direct Oxidative C−H Amidation of Heteroarenes with Sulfonamides |
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Authors: | Kun Tong Xiaodong Liu Prof?Dr Yan Zhang Prof?Dr Shouyun Yu |
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Institution: | 1. http://hysz.nju.edu.cn/yusy/;2. State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, P. R. China |
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Abstract: | A direct oxidative C?H amidation of heteroarenes with sulfonamides via nitrogen‐centered radicals has been achieved. Nitrogen‐centered radicals are directly generated from oxidative cleavage of N?H bonds under visible‐light photoredox catalysis. Sulfonamides, which are easily accessed, are used as tunable nitrogen sources and bleach (aqueous NaClO solution) is used as the oxidant. A variety of heteroarenes, including indoles, pyrroles and benzofurans, can undergo this amidation with high yields (up to 92 %). These reactions are highly regioselective, and all the products are isolated as single regioisomer. |
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Keywords: | C− H amidation heterocycles nitrogen-centered radicals photochemistry visible light |
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