Anion‐Dependent Imidazolium‐Based Catalysts for Allylation of Aniline with Tunable Regioselectivity
作者:María Albert‐Soriano、Isidro M. Pastor
DOI:10.1002/adsc.202000102
日期:2020.6.15
Metal‐free catalysts based on 1,3‐bis(carboxymethyl)imidazolium halides mediate the reaction between allylic alcohols and anilines, providing the corresponding N ‐, 2‐ and 4‐allylaniline isomers selectively. The imidazolium counterion plays a crucial role in the outcome of the reaction. Thus, while the imidazolium chloride selectively provides the N ‐substituted aniline, the bromide and iodide imidazolium
An unprecedented dehydrative C–C bond formation between unprotected anilines with benzyl alcohols is disclosed. Re2O7 catalyst (5 mol %) at elevated reaction temperature (80 °C) provided C-benzylanilines with high to excellent yields and with good chemoselectivities (over N-alkylation). A probable mechanism has been proposed based on mechanistic studies.
Synthesis of Polysubstituted Quinolines via Transition-Metal-Free Oxidative Cycloisomerization of <i>o</i>-Cinnamylanilines
作者:Mohammad Rehan、Gurupada Hazra、Prasanta Ghorai
DOI:10.1021/acs.orglett.5b00419
日期:2015.4.3
An efficient synthesis of 2-aryl 4-substituted quinolines from stable and readily available o-cinnamylanilines, prepared from anilines and cinnamylalcohols, has been developed. The reaction occurred via a regioselective 6-endo-trig intramolecular oxidative cyclization using (KOBu)-Bu-t as a mediator and DMSO as an oxidant at rt. The reaction showed a broad substrate scope with good to excellent yields.