A Synthetic Route to Chiral Tetrahydropyrroloindoles via Ring Opening of Activated Aziridines with 2-Bromoindoles Followed by Copper-Catalyzed C–N Cyclization
作者:Masthanvali Sayyad、Abhijit Mal、Imtiyaz Ahmad Wani、Manas K. Ghorai
DOI:10.1021/acs.joc.6b01049
日期:2016.8.5
A new synthetic route to nonracemic tetrahydropyrrolo[2,3-b]indoles has been developed via SN2-type ring opening of enantiopure N-activated aziridines with 2-bromoindoles followed by copper-catalyzed C–N cyclization. A series of N-activated aziridines and 2-bromoindole derivatives with different substitution patterns were studied to afford the corresponding tetrahydropyrrolo[2,3-b]indoles in good yields
通过用2-溴吲哚将对映纯N活化的氮丙啶的S N 2型开环,然后进行铜催化的CN环化,已开发出一种新的合成非外消旋四氢吡咯并[2,3- b ]吲哚的途径。研究了一系列具有不同取代模式的N活化氮丙啶和2-溴吲哚衍生物,从而以良好的收率和优异的ee(高达99%)提供了相应的四氢吡咯并[2,3- b ]吲哚。高度取代的四氢吡咯并[2,3- b ]吲哚由对映体纯的反式-二取代的氮丙啶合成为单个立体异构体(de,ee> 99%)。