Sulfamic acid as a cost-effective and recyclable solid acid catalyst for Friedel–Crafts alkylation of indole with α,β-unsaturated carbonyl compound and benzyl alcohol
作者:Jing Yang、Juan Zhang、Tian Tian Chen、De Mei Sun、Ji Li、Xue Fen Wu
DOI:10.1016/j.cclet.2011.06.006
日期:2011.12
Abstract Sulfamic acid was proved to be a cost-effective and recyclable catalyst for Friedel–Crafts type reaction of indole with α , β -unsaturated carbonylcompound and benzyl alcohol. Various indoles, α , β -unsaturated carbonylcompounds and a benzyl alcohol were successfully used in this type of reaction, and the corresponding products were obtained in good to excellent yields.
Gluconic acid aqueous solution as a sustainable and recyclable promoting medium for organic reactions
作者:Binghua Zhou、Jie Yang、Minghao Li、Yanlong Gu
DOI:10.1039/c1gc15411g
日期:——
solution (GAAS), a biobased weakly acidic liquid, was used as an effective promoting medium for organic reactions, such as the Michael addition of indoles to α,β-unsaturated ketones, the electrophilic ring-opening reaction of 3,4-dihydropyran with indoles and Friedel–Crafts alkylation of electron-rich aromatics with benzyl alcohols. The concept of using GAAS as a solvent for organic reactions not only
Metal halide hydrates as lewis acid catalysts for the conjugated friedel-crafts reactions of indoles and activated olefins
作者:Cristiane S. Schwalm、Marco Antonio Ceschi、Dennis Russowsky
DOI:10.1590/s0103-50532011000400003
日期:——
CrCl2·6H2O, CoCl2·6H2O e CeCl3·7H2O were investigated as mild Lewisacidscatalysts for the conjugate Friedel-Craftsreaction between indoles and activated olefins. The reactions were carried out with aliphatic unsaturated ketones over a period of days at room temperature, while chalcones reacted only under reflux conditions. The reactions with nitrostyrenes were either performed in solvent or under