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Indole-N-Carboxylic Acids and Indole-N-Carboxamides in Organic Synthesis.

Indoles are ubiquitous structures that distribute in natural products and biologically active molecules. The synthesis of indoles and indole-involved synthetic methodologies in organic chemistry receive considerable attention all the time. Indole-N-carboxylic acids and derived indole-N-carboxamides are intriguing compounds, which have been widely used in organic synthesis, especially in multicomponent reactions and C-H functionalization of indoles. This Minireview summarizes the advances of novel reactions involving indole-N-carboxylic acids and indole-N-carboxamides in organic chemistry, and discusses the synthetic potential and perspective of this field.