An efficient and general protocol is described for the Michaeladdition of α,β-unsaturated ketones with electron-rich arenes/indoles to give alkylated arenes/indoles under mild reaction condition at room temperature. Shorter reaction time, convenient and good isolated yields are the significant features of this protocol. Moreover, the procedure is environmentally benign in nature and applicable to
Ruthenium-catalyzed direct C3 alkylation of indoles with α,β-unsaturated ketones
作者:Shuai-Shuai Li、Hui Lin、Xiao-Mei Zhang、Lin Dong
DOI:10.1039/c4ob02124j
日期:——
paper, a simple and highly efficient ruthenium-catalyzed direct C3 alkylation of indoles with various alpha,beta-unsaturated ketones without chelation assistance has been developed. This novel C-H activation methodology exhibits a broad substrate scope such as different substituted indoles, pyrroles, and other azoles. Further synthetic applications of the alkylation products can lead to more attractive
Evidence That Protons Can Be the Active Catalysts in Lewis Acid Mediated Hetero-Michael Addition Reactions
作者:Tobias C. Wabnitz、Jin-Quan Yu、Jonathan B. Spencer
DOI:10.1002/chem.200305407
日期:2004.1.23
mechanism of Lewis acid catalysed hetero-Michael addition reactions of weakly basic nucleophiles to alpha,beta-unsaturated ketones was investigated. Protons, rather than metal ions, were identified as the active catalysts. Other mechanisms have been ruled out by analyses of side products and of stoichiometric enone-catalyst mixtures and by the use of radical inhibitors. No evidence for the involvement
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
Boron‐Catalyzed Dehydrative Friedel‐Crafts Alkylation of Arenes Using
<i>β</i>
‐Hydroxyl Ketone as MVK Precursor
作者:Htet Htet San、Jie Huang、Seinn Lei Aye、Xiang‐Ying Tang
DOI:10.1002/adsc.202001269
日期:2021.4.27
Boron‐catalyzed environmentally benign dehydrative Friedel‐Crafts alkylation of indole/pyrrole and aniline derivatives with β‐hydroxyl ketones has been developed for the first time. This method provides an efficient and green replacement of toxic and unstable methylvinylketone (MVK) by safer and cheaper β‐hydroxyl ketone. The reaction features easy operation, wide substrate scope and significantly, only water