The inexpensive Br2 can serve as a novel Lewis acid catalyst for Friedel–Crafts alkylation of indoles with α,β-unsaturatedketones. Under the catalysis of only 3 mol % of Br2, this Michael addition proceeded smoothly with high efficiency and broad substrate scope. Moreover, theoretical calculations suggested that Br2 possesses only the modest power to activate chalcones and is inferior to most tested
Palladium-Catalyzed Michael Addition of Indoles to α,β-Unsaturated Ketones in an Ionic Liquid
作者:Yan-Guang Wang、Wei-Jun Li、Xu-Feng Lin、Jun Wang、Guo-Liang Li
DOI:10.1055/s-2005-871952
日期:——
The PdCl 2 (CH 3 CN) 2 -catalyzed Michaeladdition reaction of indoles with α,β-unsaturated ketones in ionicliquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF 4 ]) to afford the corresponding 3-alkylated indolesin good yields is described. The catalyst system PdCl 4 (CH 3 CN) 2 /[bmim][BF 4 ] can be recovered and reused.
Al(OTf)3 Catalysed Friedel-Crafts Michael Type Addition of Indoles to α,β-Unsaturated Ketones with PEG-200 as Recyclable Solvent
作者:Mukut Gohain、Jc Jacobs、Charlene Marais、Barend C. B. Bezuidenhoudt
DOI:10.1071/ch13254
日期:——
An Al(OTf)3 catalysed efficient Friedel–Crafts Michael type addition of indoles to α,β-unsaturated ketones using recyclable PEG-200 as an alternative reaction solvent is disclosed. The reaction under microwave irradiation is clean, leads to excellent yields in minutes and reduces the use of volatile organic compounds.
Regioselective switching approach for the synthesis of α and δ carboline derivatives
作者:Tang-Hao Yang、Chun-Wei Kuo、Veerababurao Kavala、Ashok Konala、Chia-Yu Huang、Ching-Fa Yao
DOI:10.1039/c6cc09468f
日期:——
A metal-free protocol for accessing both [small alpha] and [small delta]-carboline derivatives, starting from a common indolylchalcone oxime ester precursor is reported. The reaction involves mild conditions and uses a regiodivergent approach....