Files in this item

FilesDescriptionFormat

application/pdf

application/pdfBEMIS-DISSERTATION-2019.pdf (7MB)
(no description provided)PDF

Description

Title:Synthesis of sesquiterpene-tropolones
Author(s):Bemis, Christopher Yngwie
Director of Research:Sarlah, David
Doctoral Committee Chair(s):Sarlah, David
Doctoral Committee Member(s):Denmark, Scott E; Hergenrother, Paul J; Silverman, Scott K
Department / Program:Chemistry
Discipline:Chemistry
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):total synthesis
organic synthesis
sesquiterpene-tropolones
meroterpenoids
tropolone
pycnidione
epolone A
epolone B
eupenifeldin
Abstract:A modular synthetic platform for the synthesis of the multi-bioactive sesquiterpene-tropolone natural products has been developed in an effort to provide general synthetic access to this class of compounds and related structures. In this work, the convergence of the sesquiterpene and tropolone fragments is enabled by a hetero-Diels–Alder reaction between a tropolone ortho-quinone methide and derivatives of α–humulene. Concise and scalable syntheses of both fragments are described, as well as alternative approaches to key intermediates. During the development of the tropolone synthesis, an unprecedented photochemical fragmentation was discovered. Two natural products, epolone B and deoxypycnidione have been synthesized employing this strategy, as well as two diastereomers of pycnidione. In these studies, a correction to the originally reported structure of epolone B is suggested based upon X-ray crystallographic data. The synthetic compounds were found to be cytotoxic to A459 and HCT116 cell lines. Current efforts are focused on synthesizing pycnidione in its correct relative stereochemical configuration. Future directions include application of these fragments in hetero-Diels–Alder reactions to synthesize related sesquiterpene-tropolones, other tropolone containing natural products, and bistropolone congeners for biological evaluation.
Issue Date:2019-04-15
Type:Text
URI:http://hdl.handle.net/2142/104826
Rights Information:Copyright 2019 Christopher Bemis
Date Available in IDEALS:2019-08-23
Date Deposited:2019-05


This item appears in the following Collection(s)

Item Statistics