Synthesis of pyrido[1,2-a]benzimidazoles and other fused imidazole derivatives with a bridgehead nitrogen atom

The key methods of synthesis of fused imidazole derivatives with bridgehead nitrogen are systematized and described. The reaction mechanisms that form the basis of synthetic routes to pyrido[1,2-a]benzimidazoles and related structures are considered. The biological properties and biological action mechanisms of fused azaheterocycles are presented. Bibliography — 152 references.