Abstract A highlyefficientone-pot, three-component synthesis of β-aminoketones was demonstrated using the cost-effective, noncorrosive, and easily available Fe(O2CCF3)3 as a catalyst for the first time. The method can be employed to synthesize a wide range of target compounds and to introduce different functional groups into the β-aminoketone skeleton. Additionally, the method consistently has the
The remarkable activation effect of alcohol solvent on kinetically inert titanocene dichloride was found to promote rapid three-component Mannichreactions. NMR and ESI-MS analyses as well as a control experiment of catalytic active species elucidated that the coordination of MeOH to the titanocene moiety unleashed the Lewis acid [Cp2Ti(OMe)2] and Brønsted acid HCl, which led to the enhanced catalytic
A new binary acid system featuring an air stable organometallic precursor, titanocene dichloride and a simple Brønsted acid–base compound, was developed. The new catalyst system allowed for mild and highly efficient direct three-component Mannich reactions of both aryl ketones and alkyl ketones, in particular, acetone and its derivatives with excellent yields. Mechanistic study elucidated the dramatic synergistic effect of the new binary acid system.
A novel lipase-catalysed direct Mannichreaction has been developed under aqueous conditions in a “one-pot” strategy. Interestingly, these promiscuous reactions can be greatly promoted by water and generally require aromatic aldehydes.
Deep Eutectic Solvent as a Recyclable Catalyst for Three-Component Synthesis of β-Amino Carbonyls
作者:Fariba Keshavarzipour、Hossein Tavakol
DOI:10.1007/s10562-014-1471-6
日期:2015.4
We have reported one-pot, three-component Mannich type reaction of aldehyde, amines and ketone (acetone and acetophenones), catalyzed by deep eutectic solvent (choline chloride/zinc chloride) at room temperature to give beta-amino carbonyls in good yields. The catalyst could be recycled at least four times without remarkable decrease in its catalytic activity. The general method is easy, fast and environmental friendly.