5-Iodo-1H-1,2,3-triazoles as Versatile Building Blocks
Ирина А. Балова, Natalia A. Danilkina, Anastasia I. Govdi
Abstract
Copper-catalyzed azide–alkyne cycloaddition is a useful tool for the synthesis of both 1,2,3-triazoles and 5-iodo-1H-1,2,3-triazoles starting from either terminal alkynes or iodoalkynes. 5-Iodotriazoles have been recognized as very useful building blocks for the synthesis of diverse 1,4,5-trisubstituted 1,2,3-triazoles. Synthetic application of 5-iodo-1,2,3-triazoles through the creation of a new C–C, C–heteroatom, or C–D(T) bond along with the application areas of both iodotriazoles and products of their modification including radiolabeled compounds are discussed. 1 Introduction 2 Synthetic Approaches to 5-Iodo-1H-1,2,3-triazoles 3 5-Iodotriazoles in C–C Bond Formation 3.1 Intermolecular C–C Cross-Coupling 3.2 Intramolecular Cross-Coupling: Direct Arylation and C–I/C–I Homocoupling 3.3 Other Transformations 4 5-Iodotriazoles in Radiolabeling, Halogen Exchange, and Heterocoupling Reactions 5 Summary