A synthetic route to 1,4-disubstituted tetrahydro-β-carbolines and tetrahydropyranoindoles <i>via</i> ring-opening/Pictet–Spengler reaction of aziridines and epoxides with indoles/aldehydes
作者:Imtiyaz Ahmad Wani、Gaurav Goswami、Sahid Sk、Abhijit Mal、Masthanvali Sayyad、Manas K. Ghorai
DOI:10.1039/c9ob02098e
日期:——
A simple and efficient synthetic route to various 1,4-disubstituted tetrahydro-β-carbolines and tetrahydropyrano[3,4-b]indoles in high yields and stereoselectivity via LiClO4-catalyzed SN2-type ring opening of aziridines and epoxides with indoles followed by p-toluenesulfonic acid (PTSA) catalyzed Pictet-Spengler reaction is described.
Catalyst-Free “On-Water” Regio- and Stereospecific Ring-Opening of Spiroaziridine Oxindole: Enantiopure Synthesis of Unsymmetrical 3,3′-Bisindoles
作者:Saumen Hajra、Somnath Singha Roy、Sk Mohammad Aziz、Dhiraj Das
DOI:10.1021/acs.orglett.7b01833
日期:2017.8.4
A catalyst-free water-mediated regio- and stereospecific ring-opening reaction of nonracemic spiroaziridine oxindoles and indoles has been developed with retention of configuration. This method provides direct access to enantiopure 3,3′-mixed bisindoles with excellent yield and enantioselectivity (up to 98% ee).