Base-promoted regioselective synthesis of 1,2,3,4-terahydroquinolines and quinolines from N-boc-3-piperidone
作者:Shally、Ismail Althagafi、Divya Singhal、Rahul Panwar、Ranjay Shaw、Amr Elagamy、Ramendra Pratap
DOI:10.1016/j.tet.2019.130695
日期:2019.11
delineated by base mediated ring transformation of 6-aryl-4-substituted-2H-pyran-2-one-3-carbonitriles by N-boc-3-piperidone followed by consecutive deprotection of Boc group under acidic conditions. This reaction involves 2 new bond formations namely C4a-C5 and C8a-C8 in order to create the nucleus. Various donor and acceptor functional groups like aryl, heteroaryl, nitrile, methylsulfanyl and secondary
通过供体基团介导的6-芳基-4-取代-2 H-吡喃-2-一-3-甲腈的碱介导的环转化,已经描述了具有供体和受体基团的1,2,3,4-四氢喹啉的有效合成。boc-3-哌啶酮,然后在酸性条件下连续脱保护Boc基团。该反应涉及2个新的键形成,即C4a-C5和C8a-C8,以产生核。在1,2,3,4-四氢喹啉中安装了各种供体和受体官能团,如芳基,杂芳基,腈,甲基硫烷基和仲胺。我们扩展了使用2-氧代苯并[ h]合成稠合的1,2,3,4-四氢喹啉的方法。]色烯作为前体。此外,我们通过DDQ对1,2,3,4-四氢喹啉进行芳香化合成了稠合和分离的喹啉,收率很高。Boc保护的四氢异喹啉6t的单晶X射线分析表明,N-Boc和芳基之间存在空间位阻。