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Rh-Catalyzed Removable Directing Group Assisted sp2 or sp3-C-H Bond Functionalization.
Angewandte Chemie 2018 October 13
In recent years, transition-metal-catalyzed C-H activation has become a key strategy in the field of organic synthesis. Among the various transition metal complexes, rhodium complexes are widely used as catalysts in a variety of C-H functionalization reactions due to their high reactivity and selectivity. In addition, because a number of rhodium complexes in various oxidation states are available, this results in diverse reaction patterns. Regioselectivity, an important issue in C-H activation chemistry, can be accomplished by using a directing group to assist the reaction. However, to obtain target functionalized compounds, it is also necessary to use a directing group that can be easily removed. Removable directing group-assisted C-H activation by rhodium catalysts has given us a fruitful combination for achieving certain types of functionalization reactions. Hence, a wide range of directed-C-H functionalization reactions catalyzed by rhodium complexes has been reported to date. In this review, we discuss Rh-catalyzed C-H functionalization reactions that are aided by the use of a removable directing group such as phenol, amine, aldehyde, ketones, ester, acid, sulfonic acid, and N-heteroaromatic derivatives.
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