Antarctic Tunicates and Endophytic Fungi: Chemical Investigation and Synthesis
Drug discovery is reliant on new developments in natural product chemistry as well as advances in chemical synthesis. The interconnectivity and interdependence of natural and synthetic investigation in drug discovery is evident. The chemical exploration reported herein elaborates the relationship be...
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ftusouthflorida:oai:digitalcommons.usf.edu:etd-4811 2023-07-30T03:56:34+02:00 Antarctic Tunicates and Endophytic Fungi: Chemical Investigation and Synthesis Lebar, Matthew D. 2010-11-05T07:00:00Z application/pdf https://digitalcommons.usf.edu/etd/3638 https://digitalcommons.usf.edu/context/etd/article/4811/viewcontent/Matthew_D._Lebar.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/etd/3638 https://digitalcommons.usf.edu/context/etd/article/4811/viewcontent/Matthew_D._Lebar.pdf default USF Tampa Graduate Theses and Dissertations polyketide polyol alkaloid indole pyrimidine American Studies Arts and Humanities dissertation 2010 ftusouthflorida 2023-07-13T21:38:21Z Drug discovery is reliant on new developments in natural product chemistry as well as advances in chemical synthesis. The interconnectivity and interdependence of natural and synthetic investigation in drug discovery is evident. The chemical exploration reported herein elaborates the relationship between natural product chemistry and chemical synthesis. Of particular interest are chemicals from organisms residing in less accessible environments, particularly Antarctica and endophytic microbial communities. Degradation via reductive ozonolysis of palmerolide A, a macrocyclic polyketide isolated from the Antarctic tunicate Synoicum adareanum, and subsequent synthetic preparation of the resulting polyols (1,2,6-hexanetriol and 1,2,3,6-hexanetetraol) led to a revision in the absolute configuration of the bioactive natural product (7R, 10R, 11R to 7S, 10S, 11S). A partial synthesis of palmerolide A (C3-14) was completed using Grubb’s 2nd generation catalyst to couple fragments formed using the previously developed methodology from the degradation study. Isolation of indole-pyrimidine containing alkaloids meridianins A, B, C, and E from the Antarctic tunicate Synoicum sp. prompted a synthetic investigation of psammopemmin A, a related alkaloid from the Antarctic sponge Psammopemma sp. resulting in reassignment of the structure of psammopemmin A to that of meridianin A. Both meridianin A and psammopemmin A were synthesized through a Suzuki coupling of the same 4-indolol nucleophile to the apposite pyrimidine electrophile. Several synthetic 3-pyrimidylindole analogs were also prepared and investigated for central nervous system, antimalarial, and cytotoxic activity. Chemical investigation of extracts from mangrove fungal endophytes that displayed antimalarial properties in vitro resulted in the isolation of several potent but cytotoxic and cytostatic compounds: cytochalasin D, roridin E, and 12,13-deoxyroridin E. Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica University of South Florida St. Petersburg: Digital USFSP Antarctic The Antarctic |
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Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
polyketide polyol alkaloid indole pyrimidine American Studies Arts and Humanities |
spellingShingle |
polyketide polyol alkaloid indole pyrimidine American Studies Arts and Humanities Lebar, Matthew D. Antarctic Tunicates and Endophytic Fungi: Chemical Investigation and Synthesis |
topic_facet |
polyketide polyol alkaloid indole pyrimidine American Studies Arts and Humanities |
description |
Drug discovery is reliant on new developments in natural product chemistry as well as advances in chemical synthesis. The interconnectivity and interdependence of natural and synthetic investigation in drug discovery is evident. The chemical exploration reported herein elaborates the relationship between natural product chemistry and chemical synthesis. Of particular interest are chemicals from organisms residing in less accessible environments, particularly Antarctica and endophytic microbial communities. Degradation via reductive ozonolysis of palmerolide A, a macrocyclic polyketide isolated from the Antarctic tunicate Synoicum adareanum, and subsequent synthetic preparation of the resulting polyols (1,2,6-hexanetriol and 1,2,3,6-hexanetetraol) led to a revision in the absolute configuration of the bioactive natural product (7R, 10R, 11R to 7S, 10S, 11S). A partial synthesis of palmerolide A (C3-14) was completed using Grubb’s 2nd generation catalyst to couple fragments formed using the previously developed methodology from the degradation study. Isolation of indole-pyrimidine containing alkaloids meridianins A, B, C, and E from the Antarctic tunicate Synoicum sp. prompted a synthetic investigation of psammopemmin A, a related alkaloid from the Antarctic sponge Psammopemma sp. resulting in reassignment of the structure of psammopemmin A to that of meridianin A. Both meridianin A and psammopemmin A were synthesized through a Suzuki coupling of the same 4-indolol nucleophile to the apposite pyrimidine electrophile. Several synthetic 3-pyrimidylindole analogs were also prepared and investigated for central nervous system, antimalarial, and cytotoxic activity. Chemical investigation of extracts from mangrove fungal endophytes that displayed antimalarial properties in vitro resulted in the isolation of several potent but cytotoxic and cytostatic compounds: cytochalasin D, roridin E, and 12,13-deoxyroridin E. |
format |
Doctoral or Postdoctoral Thesis |
author |
Lebar, Matthew D. |
author_facet |
Lebar, Matthew D. |
author_sort |
Lebar, Matthew D. |
title |
Antarctic Tunicates and Endophytic Fungi: Chemical Investigation and Synthesis |
title_short |
Antarctic Tunicates and Endophytic Fungi: Chemical Investigation and Synthesis |
title_full |
Antarctic Tunicates and Endophytic Fungi: Chemical Investigation and Synthesis |
title_fullStr |
Antarctic Tunicates and Endophytic Fungi: Chemical Investigation and Synthesis |
title_full_unstemmed |
Antarctic Tunicates and Endophytic Fungi: Chemical Investigation and Synthesis |
title_sort |
antarctic tunicates and endophytic fungi: chemical investigation and synthesis |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2010 |
url |
https://digitalcommons.usf.edu/etd/3638 https://digitalcommons.usf.edu/context/etd/article/4811/viewcontent/Matthew_D._Lebar.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
USF Tampa Graduate Theses and Dissertations |
op_relation |
https://digitalcommons.usf.edu/etd/3638 https://digitalcommons.usf.edu/context/etd/article/4811/viewcontent/Matthew_D._Lebar.pdf |
op_rights |
default |
_version_ |
1772813713925996544 |