Seven-membered rings

This chapter aims to provide an overview of the key synthetic methods, reactions, and applications reported in 2015 in the area of seven-membered heterocyclic compounds. Most of the focus has centered on benzo-derivatives containing at least one N atom, and has been driven by the search for new heterocycles with biological activity and the total synthesis of natural products. New synthetic methods of interest have included transition metal-catalyzed, dipolar cycloaddition, cascade and C-H functionalization processes. The increasing number of reports on the chemistry of heterocyclic compounds containing four or five N, O, or S atoms is also covered