One-Pot Access to Indolo[2,3-<i>b</i>]quinolines by Electrophile-Triggered Cross-Amination/Friedel–Crafts Alkylation of Indoles with 1-(2-Tosylaminophenyl)ketones
作者:Shaukat Ali、Ying-Xiu Li、Saeed Anwar、Fang Yang、Zi-Sheng Chen、Yong-Min Liang
DOI:10.1021/jo202035p
日期:2012.1.6
Activation of C2 and C3 of indoles by molecular iodine (I-2) and base followed by in situ reaction with 1-(2-tosylaminophenyl)ketones or 2-tosylaminobenzaldehyde can afford highly substituted indolo(2,3-b)quinolines in moderate to excellent yields (up to 99%). The reaction provides a metal-free selective difunctionalization of indoles. The synthetic potential of the protocol has been illustrated by the synthesis. of neocryptolepine and its 11-methyl analogue.