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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Studies toward the total synthesis of (–)-stolonidiol : a small molecule inducer of choline acetyltransferase

Barton, Thomas John 06 July 2012 (has links)
The marine diterpene (–)-stolonidiol (1) has been shown to upregulate neuronal levels of acetylcholine. The mechanism through which a small molecule can impart this allosteric-like effect is currently unknown. A laboratory preparation of the natural product was undertaken in order to produce matieral for biological testing and elucidation of the unknown mechanism of action. During the course of this study, a tandem enyne-Suzuki reaction was investigated to form both rings of the fused bi-cyclic structure 26 in a single operation, but was met with undesired diastereoselectivity in the first cyclization step. The directing effect was found to be general on 1,6-homopropargyl enynes. Further efforts toward the molecule focused on an enantioselective formation of the cyclopentane core through an extension of a copper-mediated silylcyclization of epoxyalkyne 71. Using this intermediate two routes involving acrylate as a lynchpin to close the large ring were investigated. Additionally, a route designed to employ an intramolecular Knoevenagel condensation was explored to generate this ring system. / text

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