Asymmetric reduction of prochiral inclusion complex in aqueous media |
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Authors: | Kenjiro Hattori Keiko Takahashi |
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Institution: | Department of Industrial Chemistry , Faculty of Engineering, Tokyo Institute of Polytechnics , Atsugi, Kanagawa, 243-02, Japan |
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Abstract: | Abstract In the formation of an inclusion compound, the interaction of both ionic and hydrogen bonds were shown to be involved in the asymmetric reduction of a keto acid in the presence of 6-deoxy-6-amino-β-cyclodextrin with NaBH4 in an aqueous buffer solution. Furthermore, multiple interactions were elucidated and the enatioface differentiating reduction was induced in the concerted interactions. Asymmetric reduction of a keto acid in the presence of newly prepared alkylamino-substituted β-cyclodextrin (CD) gave a higher optical yield. There should be a steric effect by a substituent group on the CD to form the conformation favoured by the multi-interaction between host and guest A mechanistic scheme for the enatioface differentiating attack of a reducing reagent on the included substrate is suggested. |
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