作者:Meng-Yang Chang、Hang-Yi Tai、Yeh-Long Chen、Ru-Ting Hsu
DOI:10.1016/j.tet.2012.07.011
日期:2012.9
A facile three-step synthetic route toward 1,3-diaryl-1H-benzo[g]indazoles 1a–1n starting with 3,4-dimethoxy-2-allylbenzaldehyde (6) in modest total yield is described. The facile route was carried by aldol condensation of aldehyde 6 with aryl methyl ketones 5a–5d in alkaline MeOH at reflux, Knorr pyrazole synthesis of the resulting chalcones 4a–4d with aryl hydrazines 3a–3e in EtOH at reflux followed
描述了一种以3,4-二甲氧基-2-烯丙基甲醛(6)为原料,以适中的总收率向1,3-二芳基-1 H-苯并[ g ]吲唑1a – 1n的简便的三步合成路线。简便的方法是醛6与芳基甲基酮5a - 5d在碱性MeOH中回流回流醛缩合,克诺尔吡唑与芳基肼3a - 3e在EtOH中回流合成得到的查尔酮4a - 4d,然后进行DDQ介导的芳构化在甲苯中回流,并进行烯烃2a的氧化裂解环化反应–在回流下,用一锅组合的OsO 4 / NaIO 4 / HOAc在THF水溶液中混合2n。