Three Heterocyclic Rings Fused (5-6-6)

Abstract

This chapter covers fused tricyclic 5-6-6 ring systems. It reviews the literature from 2007 to early 2019. Condensed heterocycles are grouped in four sections: Fused Tricyclic Heterocycles with no Ring Junction Heteroatom (Section 2). • Fused Tricyclic Heterocycles with a 5:6 Ring Junction Heteroatom (Section 3). • Fused Tricyclic Heterocycles with a 6:6 Ring Junction Heteroatom (Section 4). • Cycl[3.3.2]azines and Related Systems (Section 5). Each section contains synthetic routes to target compounds, their chemical properties and investigations of biological, biochemical, spectral and physical characteristics.