Electrocyclization-Mediated Approach to 2-Methyltriclisine, an Unnatural Analog of the Azafluoranthene Alkaloid Triclisine
作者:Claudio C. Silveira、Enrique L. Larghi、Samuel R. Mendes、Andrea B. J. Bracca、Francieli Rinaldi、Teodoro S. Kaufman
DOI:10.1002/ejoc.200900673
日期:2009.9
achieved in 10 steps and 21 % overall yield from 2-bromo-3,4-dimethoxybenzaldehyde, through the intermediacy of 3,4-dimethoxyfluoren-9-one. Construction of the heterocyclic ring entailed the para-Claisen rearrangement of an allyl-4-fluorenyl ether, followed by isomerization of the resulting 2-allylfluoren-9-one and a microwave-assisted electrocyclization of the aza 6π-electron system formed by oximation
合成了 2-methyltriclisine,一种非天然的 azafluoranthene 生物碱 triclisine 类似物。通过 3,4-二甲氧基芴-9-酮的中间体,从 2-溴-3,4-二甲氧基苯甲醛合成 10 步,总产率为 21%。杂环的构建需要烯丙基-4-芴基醚的对克莱森重排,然后是所得 2-烯丙基芴-9-one 的异构化和由肟化形成的氮杂 6π-电子系统的微波辅助电环化其羰基功能。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)