Abstract
The asymmetric reduction of acetophenone and its derivatives was achieved with sodium borohydride utilizing a novel chiral ionic liquid of β-cylclodextrin (CD), mono-6-(1-methyl-3-imidazolium)-6-deoxy-β-cyclodextrin tosylate (MIM-β-CDOTs). It was found that this chiral β-CD-based ionic liquid could provide higher enantioselectivity for the product alcohols. Moreover, the enantioselectivity of the product alcohols was highly dependent on the structure of prochiral ketones, structure of CD and reduction temperature.
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Financial support for this work was provided by the National University of Singapore (NUS) and Institute of Chemical and Engineering Sciences, Singapore. Weihua Tang also acknowledges the NUS for awarding the research scholarship.
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An erratum to this article can be found at http://dx.doi.org/10.1007/s10847-005-9037-2
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Tang, W., Tang, J., Ng, SC. et al. Asymmetric Reduction of Acetophenones with NaBH4 in the Presence of Mono-6-(1-methyl-3-imidazolium)-6-deoxy-β-cyclodextrin tosylate. J Incl Phenom Macrocycl Chem 56, 287–290 (2006). https://doi.org/10.1007/s10847-005-9018-5
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DOI: https://doi.org/10.1007/s10847-005-9018-5