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  • Asymmetric synthesis  (2)
  • Liquid crystals  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A Chiral β,δ-Dioxo-ε-sulfinyl Ester in a Convergent Enantioselective Synthesis towards the C1-C13 Polyol Fragment of Amphotericin B (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 3021-3026 
    Details
    ISSN: 1434-193X
    Keywords: Natural products ; Antibiotics ; Macrolides ; Asymmetric synthesis ; Chiral sulfoxide ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper describes an efficient stereocontrolled and convergent approach towards the C1-C13 polyol fragment of amphotericin B. The strategy is based on the stereoselective reduction of a chiral β,γ-dioxo-ε-sulfinyl ester to obtain anti- or syn-1,3-diols.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Enantioselective Synthesis of the Unsymmetrical Bis(lactone) (-)-(3E,6R,9E,12S,14R)-Colletol Induced by Chiral Sulfoxides and an Approach to (+)-Colletodiol by Asymmetric Hydroxylation of an α,β-Hydroxy Lactone (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 357-364 
    Details
    ISSN: 1434-193X
    Keywords: Asymmetric synthesis ; Sulfoxides ; Asymmetric hydroxylations ; Lactones ; Sulfoxides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---A general synthetic strategy towards the two bis(lactones) (-)-colletol (1) and (+)-colletodiol (2) is described. A common intermediate in this synthesis is the 6-membered hydroxy lactone (+)-(3R,5R)-3-hydroxy-5-hexanolide (6), readily prepared by stereoselective reduction of (+)-(SR)-methyl 3,5-dioxo-6-(p-toluenesulfinyl)hexanoate (7). Stereoselective hydroxylation of this hydroxy lactone has allowed efficient access to (+)-colletodiol (2).
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Liquid Crystals: A Tool for Studies on Chirality (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 23 (1984), S. 348-362 
    Details
    ISSN: 0570-0833
    Keywords: Liquid crystals ; Chirality ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nematic liquid crystals are extremely sensitive to optically active molecules, which, at very low concentration, convert them into cholesteric liquid crystals. The purpose of this report is to review recent applications of liquid crystals to chirality studies. A brief discussion of the structure and properties of liquid crystals is followed by a survey of the methods currently being employed for the determination of the pitch and handedness of cholesteric liquid crystals. Of special interest in the formation of induced-cholestric phases are the twisting powers of optically active compounds and the structural relationships between dopants and nematics. Liquid crystals can be used, inter alia, for the detection of small optical activities and for the determination of thermal racemization barriers and absolute configurations.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198403481
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    Paper (German National Licenses)
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