Synthetic Applications of 2-(1,3-Dithian-2-yl)indoles. 7. Synthesis of Aspidospermidine
作者:Pilar Forns、Anna Diez、Mario Rubiralta
DOI:10.1021/jo9609900
日期:1996.1.1
based on building ring E on the pyridocarbazole [ABCD] ring structure, is reported. The preparation of the pyridocarbazole framework of Aspidosperma alkaloids is a new three-step synthetic application of 2-(1,3-dithian-2-yl)indoles. A tandem conjugate addition-alkylation reaction starting from indolyldithiane (4), 3-methylenelactam 6, and EtI yields the adduct 17. Treatment of lactam 17 with DIBALH leads
报道了一种基于吡啶并咔唑[ABCD]环结构上的环E合成生物碱asposspermidine(1)的新方法。香豆碱生物碱的吡啶咔唑骨架的制备是2-(1,3-二噻二-2-基)吲哚的三步合成新应用。从吲哚基二硫醚(4),3-亚甲基内酰胺6和EtI开始的串联共轭加成-烷基化反应产生加合物17。用DIBALH处理内酰胺17导致萘并吲哚18的形成。化合物18在AcOH水溶液中异构化,得到吡啶并咔唑3。最后,环E的闭合和随后的二噻吩环的还原产生了asposspermidine。制备吡啶并咔唑2和10作为模型。