Synthesis of Indole Alkaloids: Natural Product and Target-Based Approaches

ResearchSpace/Manakin Repository

Show simple item record

dc.contributor.advisor Barker, D en
dc.contributor.advisor Copp, B en White, Reuben en 2019-01-25T01:54:15Z en 2019 en
dc.identifier.uri en
dc.description.abstract Novel chemical structures offer interesting and challenging synthetic targets with those that are bioactive having the additional advantage of providing an ideal platform for the development of new drug leads. Therefore, the development of new therapeutic agents has been an area of significant scientific focus in efforts to not only combat emerging resistant microorganism caused diseases but also a large variety of cancers for which eliminative treatment is not available, thus leaving patients in many cases with only supportive care. The research presented herein concentrates on the attempted total synthesis of the cis-enamide containing indole alkaloid kottamide E 2.64 as well as the synthesis of a variety of other related compounds through either natural product or target-based directed approaches. Kottamide E 2.64 along with related kottamides A-D 2.60-2.63 represent novel chemical structures unseen before their isolation from the extracts of the marine ascidian Pycnoclavella kottae, sourced at the Three Kings Islands, New Zealand. Furthermore, these compounds show respectable anti-cancer activity particularly against leukaemia cells displaying inhibitory concentrations as low as 14 µM. Initially the synthesis of cis-indole enamides was attempted starting from simple N-unprotected indole alkynes by the insertion of primary amides using a ruthenium-catalysed hydroamidation as the key synthetic step. A range of N-protected indole alkynes were also synthesised to overcome problems associated with purification of products obtained using the unprotected substrates. Following this, the successful synthesis of several N-protected and deprotected analogues using natural amino acids was achieved and attempts were made towards the total synthesis of kottamide E 2.64 using the unnatural amino acid derived fragment 4-amino-1,2-dithiolane-4-carboxamide 2.80. In a second project, a library of substituted 2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indoles and 9Hpyrido[3,4-b]indoles was successfully synthesised based on a target-based directed study. Using a Pictet-Spengler reaction enabled access to the desired compounds. Furthermore, molecular modelling and biological evaluation studies were carried out to determine if the prepared compounds were inhibitors of the enzyme PC-PLC and therefore potential inhibitors for the development of some cancers of which this enzyme is involved in their cell signalling pathways. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA99265112010302091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.rights.uri en
dc.title Synthesis of Indole Alkaloids: Natural Product and Target-Based Approaches en
dc.type Thesis en Chemistry en The University of Auckland en Doctoral en PhD en
dc.rights.holder Copyright: The author en
dc.rights.accessrights en
pubs.elements-id 760152 en
pubs.record-created-at-source-date 2019-01-25 en

Full text options

This item appears in the following Collection(s)

Show simple item record Except where otherwise noted, this item's license is described as


Search ResearchSpace

Advanced Search