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
Sulfonic acid-functionalized magnetic nanoparticles as a recyclable and eco-friendly catalyst for atom economical Michael addition reactions and bis indolyl methane synthesis
作者:Hajar Mahmoudi、Abbas Ali Jafari、Soroosh Saeedi、Habib Firouzabadi
DOI:10.1039/c4ra11605d
日期:——
Sulfonic acid-functionalized magnetic nanoparticles as a recyclable and eco-friendly catalyst for atom economical Michael addition reaction and bis indolyl methane synthesis.
the chemoselective Friedel–Crafts (FC) alkylation of indoles is reported. The optimal protocol allows highly functionalised indolyl compounds to be synthesised in excellent yields through conjugate addition of indoles with α,β-unsaturated ketones and nitro compounds. Finally, the use of commercial Amberlyst-15 as the heterogeneous catalyst for highly atom efficient continuous and semicontinuous Friedel–Crafts
Synthesis of 3‐substituted indoles promoted by pulverization‐activation method catalyzed by Bi(NO
<sub>3</sub>
)
<sub>3</sub>
·5H
<sub>2</sub>
O
作者:Mohammad M. Khodaei、Parvin Ghanbary、Iraj Mohammadpoor‐Baltork、Hamid R. Memarian、Ahmad R. Khosropour、Kobra Nikoofar
DOI:10.1002/jhet.5570450213
日期:2008.3
A new, facile, efficient, “green” and chemoselective procedure for the synthesis of indole derivatives has been developed with pulverization-activation method catalyzed by Bi(NO3)3·5H2O (PAMC- Bi(NO3)3·5H2O) through grinding of indoles with aldehydes or Michael acceptors in the presence of catalytic amounts of Bi(NO3)3·5H2O undersolvent-freeconditions.
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