Transition-Metal-Free Access to Pyridocarbazoles from 2-Alkynylindole-3-carbaldehydes via Azomethine Ylide
作者:Shalini Verma、Pawan K. Mishra、Manoj Kumar、Souvik Sur、Akhilesh K. Verma
DOI:10.1021/acs.joc.8b00980
日期:2018.6.15
An efficient approach for the synthesis of functionalized tetrahydro-pyrido/quinolinocarbazoles from 2-alkynylindole-3-carbaldehydes and l-proline utilizing a metal-free decarboxylative cyclization, ring expansion, and ring contraction strategy via the generation of azomethine ylide was developed. The reaction of 2-alkynylindole-3-carbaldehydes with l-thioproline leads to the formation of γ-carbolines
开发了一种有效的方法,该方法利用无金属的脱羧环化,环的扩展和环的收缩策略,通过偶氮甲meth内酯的生成,由2-炔基吲哚-3-甲醛和1-脯氨酸合成功能化的四氢吡啶基/喹啉咔唑。2-炔基吲哚-3-甲醛与1-硫代脯氨酸的反应导致形成γ-咔啉。借助于这种方便的方法,可以有效地合成多种生物活性的杂环咔唑。