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  • baccatin  (1)
  • rhodium-cobalt carbonyl clusters  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Organometallic chemistry and homogeneous catalysis of Rh and Rh-Co mixed metal carbonyl clusters (1992)
    Springer
    Journal of cluster science 3 (1992), S. 423-438 
    Details
    ISSN: 1572-8862
    Keywords: Rhodium carbonyl clusters ; rhodium-cobalt carbonyl clusters ; homogeneous catalysis ; hydrosilylation ; silylformylation ; silylcarbocyclization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The reactions of hydrosilane and/or alkyne as well as isonitriles with rhodium and rhodium cobalt mixed metal carbonyl clusters, e.g., Rh4(CO)12 and Co2Rh2(CO)12, are studied. Novel mixed metal complexes, e.g., CoRh(CO)5 (HC≡CBu n ), (R3Si)2Rh(CO) n Co(CO)4, Rh(R−N≡C)4Co(CO)4, Co2Rh2(CO)10(HC≡CR), and Co2Rh2(CO)9(HC≡CBu n ), are synthesized and identified. The catalytic activities of these rhodium and rhodium-cobalt mixed metal complexes are examined in hydrosilyation, silylformylation, and novel silylcarbocyclization reactions. Possible mechanisms for these reactions are proposed and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702749
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of novel 3′-trifluoromethyl taxoids through effective kinetic resolution of racemic 4-CF3-β-lactams with baccatins (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 9 (1997), S. 487-494 
    Details
    ISSN: 0899-0042
    Keywords: kinetic resolution ; baccatin ; taxoids ; paclitaxel ; docetaxel ; diastereoselective ; asymmetric synthesis ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The coupling of racemic 1-tBoc-4-CF3-β-lactams with various C-10 modified baccatins has resulted in CF3-taxoids with diastereoselectivities ranging from 9:1 to one single isomer. The observed high diastereoselectivity is ascribed to the highly efficient enantiomer-differentiation by the enantiopure lithium alkoxide of a baccatin III in the coupling reaction with a racemic 1-tBoc-β-lactam. These novel CF3-taxoids have also been shown to exhibit significant increases in activity against various cancer cell lines compared to either paclitaxel or docetaxel. In addition, the first asymmetric synthesis of a CF3-β-lactam via chiral ester enolate-imine cyclocondensation was performed with 50% enantioselectivity. Chirality 9:487-494, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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