Synthesis of Pyrido-Annelated Seven-Membered N-Containing Heterocycles

Pharmaceutical industry is struggling with a lack of potential drugs in the pipe line. However, there is still a great opportunity to elaborate interesting scaffolds for medicinal chemistry. Various scaffolds that hold promise are rarely described in the literature. The last couple of decades, the wide range of biological activities of benzodiazepine derivatives have been investigated thoroughly and make the benzodiazepine scaffold, particularly the 1,4-benzodiazepine system, one of the most important structures for drug discovery. The substantial research on benzodiazepines has led to the synthesis of heterocycle-fused azepine derivatives with potentially new pharmacological activity. Some pyridoazepines are known to be active in the central nervous system and have a comparable activity to the well-known benzodiazepine scaffolds, which make the synthesis and study of pyridoazepines an important research topic.