Step-Economical C–H Activation Reactions Directed by In Situ Amidation

Owing to the inherent ability of amides to chelate transition-metal catalysts, amide-directed C–H activation reactions constitute a major tactic in directed C–H activation reactions. While the conventional procedures for these reactions usually involve prior preparation and purification of amide substrates before the C–H activation, the step economy is actually undermined by the operation of installing the directing group (DG) and related substrate purification. In this context, directed C–H activation via in situ amidation of the crude material provides a new protocol that can significantly enhance the step economy of amide-directed C–H activation. In this short review, the advances in C–H bond activation reactions mediated or initiated by in situ amidation are summarized and analyzed.

1 Introduction

2 In Situ Amidation in Aryl C–H Bond Activation

3 In Situ Amidation in Alkyl C–H Bond Activation

4 Annulation Reactions via Amidation-Mediated C–H Activation

5 Remote C–H Activation Mediated by Amidation

6 Conclusion

Synthesis of 3-halochromones with simple KX halogen sources enabled by in situ halide oxidation

An in situ oxidation strategy for generating molecular halogen has been developed for the synthesis of 3-halochromones by employing simple potassium halides as halogen sources.