Indazole-containing derivatives represent one of the most important heterocycles in drug molecules. Diversely substituted indazole derivatives bear a variety of functional groups and display versatile biological activities; hence, they have gained considerable attention in the field of medicinal chemistry. This review aims to summarize the recent advances in various methods for the synthesis of indazole derivatives. The current developments in the biological activities of indazole-based compounds are also presented.

An efficient metal, catalyst, and oxidant free sulfonylation reaction, enabled by a visible-light-driven electron donor–acceptor (EDA) complex induced radical coupling reaction has been reported.