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Due to their advantageous physicochemical properties, metabolic stability, and bioisosterism with carboxylic acid and amide groups, tetrazole derivatives represent a valuable class of heterocycles that play a crucial role in medicinal chemistry and drug development. Advances in chemistry have enabled the versatile synthesis of tetrazole-based compounds. Therefore, optimizing the potential of tetrazoles to produce lead compounds requires effective synthetic access to a wide range of derivatives. According to the published papers, there are several methods for preparing tetrazole and its mono- and disubstituted derivatives, including 5-substituted 1H-tetrazoles, 2-substituted 1H-tetrazoles, 2,5- and 1,5-disubstituted, fused heterocycles, tetrazole derived hybrid azaheterocycles, etc. The use of tetrazoles as ligands, in bridging roles, in multiple tetrazole syntheses, and in other heterocyclic ring forms is also demonstrated. Alkylation, nucleophilic and electrophilic substitution in the side chain, electrophilic substitution at the ring carbon atom, and the effect of the reagents used are among the chemical characteristics of tetrazoles that are investigated. This mini-review also examines synthetic processes and discusses their benefits and drawbacks in this field of study.
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