Six-Membered Ring Systems

This is a personal overview of the most exciting chemistry on the synthesis of O- and S-6-membered heterocycles published in 2016. Novel approaches for the synthesis of a huge variety of natural compounds, specific reactions, and reagents for the preparation of natural and synthetic pyrans, chromenes and chromans, isochromenes and isochromans, pyranones, coumarins and isocoumarins, chromones and chromanones, xanthenes and xanthones, thiopyrans and analogs, dioxanes, dithiins, and also oxathianes are highlighted.