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A novel recyclable functionalized chiral ionic liquid has been developed to promote asymmetric Michael additions of cyclohexanone to both aryl and alkyl nitroolefins in the presence of 20 mol% of organocatalyst 4 in MeOH. The process affords synthetically valuable chiral products in good yields (up to 93%) and high enantioselectivities (up to 92%). The chiral ionic liquid could be easily reused six times without remarkable decrease in yields and enantioselectivities.
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Li et al. (2012) studied this question.
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