Regioselective Annulation of Seven-, Eight-, and Nine-Membered Azaheterocycles to Benzimidazole Starting from Chloro-Substituted 2-Aza-1,3-dienes - Demydchuk, Bogdan A; Brovarets, Vladimir S; Chernega, Alexander N; Rusanov, Eduard B; Drach, Boris S (Synthesis, 2006)