New Synthesis ofβ-Anilinochalcones by Regioselective Oxidation ofβ-Anilinodihydrochalcones Using Iodine–DMSO
摘要:
beta-Anilinodihydrochalcones readily undergo oxidation alpha to the carbonyl group region in the presence of a catalytic amount of iodine in dimethyl sulfoxide at 130 degrees C in good yield. Oxidation of allyloxy-substituted beta-anilinodihydrochalcones to beta-anilinochalcones is a preferred reaction over deallylation.
Résumé Rice-husk-supported FeCl3 nano-particles (FeCl3–RiH) were prepared and used as an environmentally friendly catalyst in the synthesis of β-amino carbonyl compounds, 1,8-dioxo-octahydro xanthenes, and bis-indolyl methanes from simple and readily available precursor molecules.
Abstract A highlyefficient clean and simple methodology has been established for the one-pot Mannichreaction using ionic liquid-immobilized proline(s) organocatalyst under solvent-free conditions. The three components comprising substituted acetophenones, substituted aromatic aldehydes and substituted aromatic amines underwent Mannichreactions in the presence of 7 mol% of ionic liquid-immobilized
SnCl2-catalyzed three-component one-pot Mannich-type reaction: efficient synthesis of β-aminocarbonyl compounds
作者:Min Wang、Zhi-Guo Song、Xin Wan、Suang Zhao
DOI:10.1007/s00706-009-0163-1
日期:2009.10
AbstractSnCl2-catalyzed three-component one-pot Mannich reaction of acetophenone or p-chloroacetophenone with different aromaticaldehydes and aromatic amines in ethanol at ambient temperature gave the corresponding β-aminocarbonyl compounds in good to excellent yields. Four new compounds are reported for the first time. Graphical abstract
Under the high-speed vibration milling conditions, the solvent and catalyst-free azo-Michael addition of chalcone derivatives and amines was found to proceed efficiently in excellent yields at ambient temperature in short reaction time. In most cases, conventional side reactions were avoided and thus quantitative yields were achieved. The influences of the vibration frequency and reaction time on the azo-Michael addition were investigated.