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Filtering by: Creator Blankenship, H. Lee Remove constraint Creator: Blankenship, H. Lee Advisor White, James D. Remove constraint Advisor: White, James D.

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  • Total synthesis of phorboxazole A

    Creator:
    Lee, Tae Hee
    Abstract:
    The total synthesis of a highly potent cytotoxic marine natural product, phorboxazole A, is described. Both a palladium(II)-mediated and a palladium(II)-catalyzed intramolecular alkoxycarbonylation were used as key steps for the preparation of the two cis-2,6-disubstituted tetrahydropyran rings (C22-C26 and C11-C15) of phorboxazole A. The synthesis used a convergent approach involving...
    Resource Type:
    Dissertation
    Full Text:
    ABSTRACT OF THE DISSERTATION OF Tae Hee Lee for the degree of Doctor of Philosophy in Chemistry

  • Synthetic studies on necic acids of pyrrolizidine alkaloids

    Creator:
    Lee, Nadine Chauyi
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Nadine Chauyi Lee for the degree of Doctor of Philosophy in

  • Approaches to the synthesis of polyketides. Vermiculine

    Creator:
    Kirkemo, Curtis Lee
    Abstract:
    An approach to the generation of polyketides was investigated, which involved ozonolysis of 6, 7 cyclopenteno -1> 4, 5, 8 -tetrahydromethoxy- 3-methylnaphthalene (26), to produce what is believed to be polyketide 27. Compound 26 was formed by the following sequence: Die ls -Alder addition of 1, 2 -dim.ethylenecyclopentane and 2...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE THESIS OF CURTIS LEE KIRKEMO for the

  • Asymmetric synthesis of cyclopropanes via a "zipper reaction"

    Creator:
    Lincoln, Christopher M.
    Abstract:
    The rearrangement of a homoallyl cation to a cyclopropylcarbinyl cation is thought to play a role in the biogenesis of a variety of cyclopropane-containing natural products,¹ a hypothesis which has previously led to the design of successful biomimetic syntheses of several natural products.² The strategy underlying this approach to cyclopropane...
    Resource Type:
    Dissertation
    Full Text:
    ), neohalicholactone (189), and the solandelactones A-H (190-197) constructed around a trans- cyclopropane core is

  • Studies toward the total synthesis of (+)-providencin

    Creator:
    Jana, Somnath
    Abstract:
    Studies toward the total synthesis of (+)-providencin (1), a highly oxygenated cembranoid dipterpene with a unique bicyclo[12.2.0]hexadecane skeleton and pronounced biological activity, are described. These studies resulted in the synthesis of advanced intermediates 320 and 332 which contain all of the carbon atoms of 1. In a first generation approach...
    Resource Type:
    Dissertation
    Full Text:
    to couple the two major fragments, 228 and 288, using palladium-catalyzed C-H activation of the

  • Intramolecular diels-alder cycloadditions of citraconic and mesaconic esters ; Studies on the synthesis of the northwest and southeast segments of boromycin

    Creator:
    Sheldon, Bernard Gale
    Resource Type:
    Dissertation
    Full Text:
    / 70 h /- CO2Me HO 19 +20 17 18 21 22 23 7 tl,z,t this reaction has a marked electronic

  • Cis-2,5-diaminobicyclo[2.2.2]octane : a novel C₂-symmetric scaffold for asymmetric catalysis

    Creator:
    Shaw, Subrata
    Abstract:
    This thesis describes the development of a new enantioselective synthetic method employing chiral cis-2,5-diaminobicyclo[2.2.2]octane-based organometallic catalysts. The significance of this new method to organic synthesis is illustrated with preparation of enantioenriched products that are transformed to important pharmaceutical agents. Chapter 1 provides a brief historical overview of asymmetric catalysis, especially...
    Resource Type:
    Dissertation
    Full Text:
    Thalidomide (1) (R)-antiemetic (S)-teratogenic MeO Ni,_ ( -.I) ' N CI H Nexium (4) racemic: Prilosec OH H

  • Studies towards the total synthesis of (-)-gymnodimine

    Creator:
    Wang, Guoqiang
    Abstract:
    Studies towards the total synthesis of (-)-gymnodimine (1), a marine neurotoxin with a unique molecular architecture and pronounced biological activity, are described. These studies resulted in a convergent approach to the advanced intermediate 315, containing the C3-C32 section of 1. Two synthetic routes were developed to construct the tetrahydrofuran subunit...
    Resource Type:
    Dissertation
    Full Text:
    . Korf, Christian L. Kraneman, Punlop Kuntiyong, Chang-Sun Lee, Tae-Hee Lee, Christopher M. Lincoln

  • Studies toward the total synthesis of phorboxazole A

    Creator:
    Kuntiyong, Punlop
    Abstract:
    Studies toward the total synthesis of a highly potent cytotoxic marine natural product, phorboxazole A, were conducted and resulted in a route to an advanced intermediate, C4-C32, for this purpose. A key feature of our approach is the stereoselective synthesis of two cis-2,6-disubstituted tetrahydropyrans present in the macrolide portion of...
    Resource Type:
    Dissertation
    Full Text:
    tremendously. I have to say that working in the same lab as Tae-Hee Lee is very inspiring since he works

  • Total synthesis of indole alkaloids: pt. 1. Asymmetric synthesis of (-)-ibogamine. pt. 2. An approach toward the synthesis of koumine

    Creator:
    Choi, Younggi
    Abstract:
    PART I. The preparation of (-)-ibogamine (1) in fourteen steps from benzoquinone and in 10% overall yield is a powerful illustration of the value of the asymmetric Diels-Alder reaction as a starting point in a multistep synthesis. All four cycloadducts, 70, 77, 84 and 96, obtained with the (S)-BINOL-TiCl₂ complex...
    Resource Type:
    Dissertation
    Full Text:
    Kuntiyong, Chang-Sun Lee, Nadine Lee, Tae-Hee Lee, Christopher M. Lincoln, Barton W. Phillips, Laura