Regioselective Annulation of Seven-, Eight-, and Nine-Membered Azaheterocycles to Benzimidazole Starting from Chloro-Substituted 2-Aza-1,3-dienes
作者:Boris Drach、Bogdan Demydchuk、Vladimir Brovarets、Alexander Chernega、Eduard Rusanov
DOI:10.1055/s-2006-942453
日期:——
Readily available 1-aryl-1,3,4,4-tetrachloro-2-azabuta-1,3-dienes enter into a pronouncedly directed cyclocondensation reaction with 2-(Ï-aminoalkyl)benzimidazoles to give the corresponding seven-, eight-, and nine-membered azaheterocycles regioselectively annulated to the benzimidazole nucleus. The products thus obtained are derived from benzimidazole fused to 2H-1,3,5-triazepine, 1,3,5-triazocine, or 2H-1,3,5-triazonine, in accordance with comprehensive structural determination by spectroscopic methods and X-ray diffraction analysis.
现成的 1-芳基-1,3,4,4-四氯-2-氮杂吲哚-1,3-二烯与 2-(Ï-氨基烷基)苯并咪唑发生明显的定向环缩合反应,生成相应的七元、八元和九元杂环,并可选择性地环化到苯并咪唑核上。根据光谱法和 X 射线衍射分析法进行的全面结构测定,由此获得的产物来自与 2H-1,3,5-三氮杂卓、1,3,5-三氮杂环辛或 2H-1,3,5-三嗪融合的苯并咪唑。