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  • 1
    Electronic Resource
    Electronic Resource
    Stereoselektive Synthese von 3-substituierten Cyclobutanolen und Folgeprodukten (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2759-2763 
    Details
    ISSN: 0009-2940
    Keywords: Dichloroketene ; Stereoselective ketone reduction ; Mitsunobu reaction ; Cyclobutyl bromides ; Cross-coupling reaction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Stereoselective Synthesis of 3-Substituted Cyclobutanols and Products Derived Therefrom3-Substituted cyclobutanones 2 are prepared by alkene/dichloroketene cycloadditions and subsequent dehalogenation. Reduction with LiAlH(OtBu)3 furnishes cis-cyclobutanols 3 in 95-100% selectivity. Mitsunobu inversion turned out to be the only practical method to get trans isomers 4 in high selectivity. A stereoselective cyclobutanol→bromocyclobutane conversion could be achieved only by a modified Mitsunobu reaction. Cross coupling between zinc derivatives of bromocyclobutanes 9 and aromatic bromides is not stereoselective.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931261228
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesen von hydroxylierten Bipyridinen, III. Synthese von unsymmetrischen und symmetrischen Dihydroxybipyridinen (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 953-959 
    Details
    ISSN: 0170-2041
    Keywords: Bipyridinediols ; Pyridines ; Stannylpyridines ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses of Hydroxylated Bipyridines, III.  -  Synthesis of Unsymmetrically and Symmetrically Structured DihydroxybipyridinesFifteen symmetrical and asymmetrical dimethoxybipyridines and the pertinent diols are prepared and characterized. Reductive cross coupling of halopyridines with Ni(0) may result in complex mixtures. The same is true for an alternative reaction of (trimethylstannyl)pyridines with halopyridines in the presence of Pd(0). UV, 1H-, and 13C-NMR spectra of the bipyridine derivatives are tabulated.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1992199201157
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    Paper (German National Licenses)
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