Total Synthesis of jerantinine alkaloids and a biocatalytic synthesis of 2,6 - Disubstituted tetrahydropyrans using an alcohol dehydrogenase
Publication Date
December 31, 2020
Creator
Abstract
This thesis is comprised of two sections; The first is a semi synthesis of the cytotoxic natural product jerantinine A. Starting from the natural product tabersonine, isolated from Voacanga africana, which contains the 3 stereocenters present in jerantinine alkaloids set in the correct conformation. The reaction conditions were optimised and produced jerantinine A from tabersonine in a 16% yield over 7 steps. Following this, the biological activity was evaluated using MCF-7 Cancer cell lines, a clonogenic assay, cell cycle analysis and a tubulin polymerisation assay. These results concluded that jerantinine A was a tubulin destabilising agent and were visualised using confocal microscopy.
The second section is using alcohol dehydrogenases in the formation of disubstituted tetrahydropyrans. The biocatalytic strategy of the synthesis of 2-6, disubstituted tetrahydropyrans was achieved using an alcohol dehydrogenase triggered intramolecular oxa-Michael reaction from prochiral ketoenone starting materials. These were produced in good yields with up to >99% e.e. and 12:1 d.r.. This methodology was then used in the synthesis of an analogue of the natural product brocaketone A in a 26% yield over the synthesis. 2,5-Disubstituted tetrahydrofurans were also produced using this methodology but were produced in poor d.r
Item Type
ethesis
Thesis Type
PhD
Supervisors
Subjects (LC)
Associated Schools / Departments
School of Chemistry
eprints ID
63797
UoN Repository URI
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Final Thesis Harry Eastman(3).pdf
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Full-text
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Examined. Harry Eastman Ph.D. Thesis
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4.17 MB
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