Influence of ionic liquids on the phase transfer-catalysed enantioselective Michael reaction

The enantioselective Michael addition of dimethyl malonate to 1,3-diphenylprop-2-en-1-one promoted by a quaternary derived ammonium salt from quinine as a phase transfer catalyst in different ionic liquids, 1-butyl-3-methyl imidazolium hexafluorophosphate, [bmim]PF6, 1-butyl-3-methyl pyridinium tetrafluoroborate, [bpy]BF4, 1-butyl-3-methyl imidazolium tetrafluoroborate [bmim]BF4 as well as in conventional organic solvents was studied.