Synthesis of 3-Aryl-2-methoxyinden-1-one (<i>Z</i>)-Phenylhydrazones<i>via</i>Hydrobromic Acid-Mediated Cyclization of 2-(1-Aryl-2-methoxyethenyl)benzaldehyde Phenylhydrazones
作者:Kazuhiro Kobayashi、Wataru Miyatani、Naoki Matsumoto
DOI:10.1002/hlca.201200277
日期:2013.2
2‐(1‐Aryl‐2‐methoxyethenyl)benzaldehydes 2, obtained by successive treatment of 1‐(1‐aryl‐2‐methoxyethenyl)‐2‐bromobenzenes 1 with BuLi and 1‐formylpiperidine, were transformed to the corresponding phenylhydrazones 3 on treatment with PhNHNH2. When these hydrazones were allowed to react with conc. HBr, cyclization, followed by dehydrogenation with air occurred, furnished 3‐aryl‐2‐methoxyinden‐1‐one
2-(1-芳基-2-甲氧基乙烯基)苯甲醛2,由1-(1-芳基-2-甲氧基乙烯基)的连续处理获得-2-溴苯1用BuLi和1-甲酰基哌啶,转化成相应的苯腙3上用PhNHNH 2处理。当这些与浓溶液反应时。溴化氢,环化,然后进行空气脱氢,得到3-芳基-2-甲氧基茚满1-1 (Z)-苯并azo 4。