Abstract:
The abundance of six-membered oxygen containing heterocycles in bioactive natural products continues to encourage the development of new and improved syntheses. There is a vast amount of new literature dedicated to the synthesis of pyrans and their benzo derivatives; however, many traditional approaches are still of great value and this chapter should be read in conjunction with the corresponding chapters in the first and second editions of Comprehensive Heterocyclic Chemistry <1984CHEC, 1996CHEC-II>....