Acid-catalysed intramolecular Friedel–Crafts annulation of hetero-atom-functionalized <i>para</i>-quinone methides: access to O-, S- and N-based heterocycles
We describe here an acid-mediated one-pot approach to access substituted xanthene and thioxanthane derivatives from ortho-heteroaryl phenyl-substituted para-quinone methides via 1,6 intramolecular arylation. The scope of this work was further elaborated to the synthesis of 10H-indolo[1,2-a]indole-based heterocyclic systems using indole based para-quinone methides.
我们在这里描述了一种酸介导的一锅法,通过1,6 分子内芳基化从邻杂芳基苯基取代的对醌甲基化物中获得取代的呫吨和噻吨烷衍生物。这项工作的范围进一步阐述为使用吲哚基对醌甲基化物合成10 H-吲哚并[1,2- a ]吲哚基杂环系统。
Synthesis of Hydroxylated and Methoxylated Polybrominated Diphenyl Ethers − Natural Products and Potential Polybrominated Diphenyl Ether Metabolites
作者:Göran Marsh、Roland Stenutz、Åke Bergman
DOI:10.1002/ejoc.200300081
日期:2003.7
Hydroxylated and methoxylated polybrominated diphenyl ethers (OH-PBDEs and MeO-PBDEs) may be natural products or they may be formed as metabolites of polybrominated diphenyl ethers (PBDEs), frequently used as flame retardants. The aim of this work was to synthesize authentic OH- and MeO-PBDE reference standards for analytical and toxicological studies. Brominated phenoxybenzaldehydes were prepared