Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.795673
Title: Studies in natural product chemistry
Author: Johnston, James Pyott
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1969
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Abstract:
The first section of this thesis is concerned with a biogenetic-type approach to the synthesis of the aconitine-lycoctonine group of diterpene alkaloids. The synthetic precursor, atisine, was transformed in an eleven step sequence into a keto-tosylate. This material underwent a novel, stereospecific pyrolytic rearrangement to give a key intermediate in the proposed atisane-aconane biogenesis, whose constitution and stereochemistry were confirmed by anx-ray crystallographic analysis, conducted on a heavy atom derivative. Our efforts to convert this intermediate into the desired aconitine-lycoctonine skeleton, a task which had already been accomplished in principle by other workers, met with limited success. N. M. R. studies on some acetamides, obtained in the foregoing synthesis, revealed an interesting example of restricted rotation around the bond. Variable temperature work enabled a crude barrier to rotation to be extracted. The second section of the thesis, also in the realm of diterpenes, concerns the synthesis of the cassane skeleton, in a biogenetically-patterned fashion, from isopimaric acid. The route from isopimaric acid to an important intermediate enone is described. Despite numerous attempts,we could not induce the Wagner-Meerwein rearrangement in this enone,which would have resulted in the desired cassane skeleton.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.795673  DOI: Not available
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