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Title: Silacyclohex-4-enes : novel silene-cycloadducts for organic synthesis
Author: Sellars, Jonathan D.
ISNI:       0000 0004 2714 1938
Awarding Body: Durham University
Current Institution: Durham University
Date of Award: 2008
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Silenes, compounds containing a Si=c double bond, are highly reactive and are normally observed as transient intermediates which readily dimerise. Evidence for their existence was first reported in 1967 by Gusel'nikov and Flowers.(^1) However, since then only minimal effort has been made to exploit their unique reactivity in organic synthesis. This thesis describes research concerning the chemistry of silenes and more specifically their Diels-Alder adducts, silacyclohex-4-enes. These cycloadducts were utilised as building blocks for organic synthesis, enabling the total synthesis of prelactone B (R = 'Pr) and an analogue (R = Ph) to be achieved in high yields over 5 steps (Figure I) Figure 1 In addition, a unique application of the Hosomi-Sakurai reaction to the cycloadducts provides access to a unique 1,4-monoprotected diol and tetrahydronaphthalene, both possessing four contiguous chiral centres. This methodology was then applied to the total synthesis of the podophyllotoxin analogue, epipicropodophylin (Figure 2)
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available