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A ligand‐ and additive‐free aerobic cobalt‐catalyzed synthesis of 2‐aminobenzimidazoles from 2‐aminoanilines was developed. A variety of aminoanilines and isonitriles undergo efficient coupling to furnish substituted 2‐aminobenzimidazoles in moderate to excellent yields. This protocol enables efficient access to the unsubstituted 2‐aminobenzimidazoles.
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Liu et al. (2019) studied this question.
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