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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.
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Showing 71 to 80 of 303 (0.062 seconds)| 71 |
Part I. Studies towards a total synthesis of laulimalide Part II. Studies on the detection of levuglandinsSingh, Upinder January 1994 (has links)
No description available.
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| 72 |
First Total Synthesis of the Novel Brominated Polyacetylenic Diol (+) – Diplyne D and Progress Towards the Total Synthesis of (+) - Diplyne EJones, Amanda L. 29 April 2005 (has links)
No description available.
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| 73 |
Studies towards a total synthesis of alkaloids manzamine A and cylindrospermopsin and development of a complex example of the Dowd-Beckwith rearrangementHavas, Fabien 30 March 2004 (has links)
No description available.
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| 74 |
Total Synthesis Of Polyene Natural Products Lucilactaene And Gymnoconjugatin: Development Of A Boron-Tin LinchpinWalczak, Matthew C. 15 April 2008 (has links)
No description available.
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| 75 |
Studies Toward the Completion of the C29-C51 Segment of Spongistatin 1Stewart, Catherine A. 10 September 2008 (has links)
No description available.
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| 76 |
Studies Toward Syntheses of Chaparrinone and PolyandraneYang, Dexi 12 September 2008 (has links)
No description available.
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| 77 |
Studies toward completion of the C1-C28 segment of spongistatin 1. Synthesis and photochemistry of 4bH-pyrido[2,1-a]isoindol-6-oneModolo, Isabelle 27 August 2009 (has links)
No description available.
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| 78 |
Studies Toward the Total Synthesis and Structure Determination of Leiodelide AChellat, Mathieu François 27 September 2011 (has links)
No description available.
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| 79 |
Total Synthesis of Dinophysistoxin-2 and its AnaloguesPang, Yucheng 28 September 2011 (has links)
No description available.
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| 80 |
Total Synthesis of (±)-Ginkgolide C and Formal Syntheses of (±)-Ginkgolide A and (±)-Ginkgolide BHébert, Martin 15 September 2022 (has links)
Ginkgolides are naturally occurring compounds that can be extracted from the Ginkgo Biloba tree. Their synthesis remains a significant challenge for organic chemists given their complex structure and their numerous stereocenters (2 adjacent quaternary carbons and up to 12 stereocenters). Both Corey and Crimmins reported the total synthesis of (±)-ginkgolide B in 1988 and 1999 respectively. Corey also published the enantioselective formal synthesis of (±)-ginkgolide B as well as the total synthesis of (±)-ginkgolide A in 1988. However, the total synthesis of Ginkgolide C, the most oxygenated and most complex member of the family, has not yet been published. We report herein the first total synthesis of (±)-ginkgolide C as well as the formal synthesis of (±)-ginkgolide A and (±)-ginkgolide B by intercepting Corey’s intermediate (from his total synthesis of (±)-ginkgolide B). The first key step of our syntheses was the Claisen rearrangement which set the first quaternary carbon. The second key step of the syntheses was a kinetic alkylation which sets the second quaternary carbon. The third key step for our syntheses was an enyne epoxidation which enabled the formation of the E-ring. Starting from the Claisen rearrangement adduct, our target intermediate (towards ginkgolide C) was obtained in 18 steps, after which, (±)-ginkgolide C was synthesized in an additional 6 step (total of 26 linear steps). Starting again from the Claisen rearrangement adduct, Corey’s intermediate (from the total synthesis of (±)-ginkgolide B) was obtained in 15 steps which completed the formal syntheses of (±)-ginkgolide A (in an additional 10 steps) and (±)-ginkgolide B (with 6 additional steps).
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