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  • 1
    Electronic Resource
    Electronic Resource
    Catalytic Enantioselective Conjugate Addition of Dialkylzinc Compounds to Chalcones (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1205-1215 
    Details
    ISSN: 0009-2940
    Keywords: Addition, conjugate ; Pyridines, optically active ; Chiral ligands ; Asymmetric synthesis ; Catalysis, enantioselective ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conjugate addition of diethylzinc to enones is catalyzed by a complex derived from Ni(acac)2 and C2-symmetric 2,2′-bipyridine 3 or chiral pyridines 5-12. The products are obtained with optical purities up to 89% ee. A strong positive nonlinear relationship between the enantiomeric excess of the ligand and the ee of the product has been observed. The factors which govern catalyst activity and enantioselectivity have been investigated.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250530
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Enantioselective Synthesis of Optically Active Pyridine Derivatives and C2-Symmetric 2,2′-Bipyridines (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1169-1190 
    Details
    ISSN: 0009-2940
    Keywords: 2,2′-Bipyridines ; Pyridines, optically active ; Chiral ligands ; Asymmetric synthesis ; Catalysis, enantioselective ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Optically active pyridine derivatives 2, 15, 18, 19, 21, 26, and 27 are obtained by enantioselective reduction of the corresponding ketones 5, 7, 11-13, 24, and 25 using the chiral borane reagent chlorodiisopinocampheylborane [(Ipc)2BCl]. Nickel(0)-mediated coupling of bromopyridines 2, 15, and 31 gives C2-symmetric 2,2′-bipyridines (R,R)-32, (R,R′)-33, and (S,S)-38, respectively, which form metal complexes with CoII, PdII, CuI, and AgI. Aryl-substituted pyridines 26, and 39-41 are synthesized by palladium(0)-catalyzed cross couplings of 2 and 15 with boronic acids 42-44.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250528
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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