Synthetic Strategies Towards O6-Substituted Guanine Derivatives and their Application in Medicine

This article focuses on the synthesis of O6-substituted guanine derivatives and their application in medicine. O6-substituted guanines with alky-, aryl and heteroaryl-substituents and sterically challenging substituents have been described. The synthetic strategies are mainly based on different leaving groups in the 6-position of the guanine. Here, synthesis of various derivatives are described as well as the different synthetic pathways to obtain the synthetic precursors, which are prerequisites for efficient syntheses.