The facile and efficient Michael addition of indoles and pyrrole to α,β-unsaturated electron-deficient compounds catalyzed by aluminium dodecyl sulfate trihydrate [Al(DS)3]·3H2O in water
Ruthenium-Catalyzed Functionalization of Pyrroles and Indoles with Propargyl Alcohols
作者:Nora Thies、Cristian G. Hrib、Edgar Haak
DOI:10.1002/chem.201200188
日期:2012.5.14
Several ruthenium‐catalyzed atom‐economic transformations of propargylalcohols with pyrroles or indoles leading to alkylated, propargylated, or annulated heteroaromatics are reported. The mechanistically distinct reactions are catalyzed by a single ruthenium(0) complex containing a redox‐coupled dienone ligand. The mode of activation regarding the propargylalcohols determines the reaction pathway
additions of heterocyclic compounds, such as indoles, pyrrole, pyrazole, and imidazole, have been demonstrated. Hafnium chloride effectively catalyzed the conjugate addition of indoles to α,β-unsaturatedcarbonyl compounds, and the addition product was obtained in high yield. The reaction of pyrrole was also catalyzed by HfCl4 or ScCl3, and produced 2,6-dialkylated pyrroles up to 99% yields. Furthermore
Pyrrole, pyrazole and imidazole undergo conjugate addition with α,β-unsaturated ketones in the presence of a catalytic amount of hafnium chloride at room temperature. Although the reaction of pyrrole gave 2,5-substituted C-adduct mainly, those of pyrazole and imidazole gave the corresponding N-adducts in excellent yields.
Efficient Friedel–Crafts alkylation of indoles and pyrrole with enones and nitroalkene in water
作者:Najmedin Azizi、Fezzeh Arynasab、Mohammad R. Saidi
DOI:10.1039/b610263h
日期:——
An operationally simple and entirely green protocol for heteropoly acid (10 mg) catalyst conjugate addition of indoles and pyrrole to unsaturated carbonyl compounds and nitroalkene in water at ambient temperature in good to excellent yields has been developed.
The facile and efficient Michael addition of indoles and pyrrole to α,β-unsaturated electron-deficient compounds catalyzed by aluminium dodecyl sulfate trihydrate [Al(DS)<sub>3</sub>]·3H<sub>2</sub>O in water
Aluminium dodecyl sulfate trihydrate [Al(DS)3]·3H2O is easily prepared and can be used as a Lewis acid surfactant catalyst in water to conduct the highly efficient Michael addition of indoles and pyrrole to α,β-unsaturated electron-deficient compounds at room temperature.