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This review describes recent advances in transition-metal-catalyzed C-H functionalization reactions of pyrazoles to form new C-C and C-heteroatom bonds on the pyrazole ring. In contrast to traditional cross-coupling reactions that require pre-functionalized pyrazoles, direct C-H functionalization reactions provide access to a wide range of functionalized pyrazoles in a single step. Various strategies are presented and the efficiency and regioselectivity are described with respect to the types of functional groups that are installed.
Kang et al. (Wed,) studied this question.