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A new Pd-catalyzed C–H/C–B coupling of sterically hindered heteroarenes and arylboronic acids has been identified. The newly established Pd(OAc)2/bisoxazoline/TEMPO system not only enables the synthesis of sterically hindered heterobiaryls but also offers an opportunity for enantioselective biaryl coupling through C–H functionalization.
Yamaguchi et al. (2012) studied this question.