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Design and synthesis of rotational analogues of estradiol
Studies have been conducted in synthesising bridged analogues of estradiol in which the ring D hydroxy group is displaced from the 17-position. The aim was to explore the possible rotational equivalence between such analogues and estr~diol. The synthetic routes investigated were based upon cycloaddi...
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| Language: | English |
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Department of Chemistry
2024
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| _version_ | 1867613167333408768 |
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| access_status_str | Open Access |
| author | Seymour, Anthony James |
| author2 | Bull, J.R |
| author_browse | Bull, J.R Seymour, Anthony James |
| author_facet | Bull, J.R Seymour, Anthony James |
| author_sort | Seymour, Anthony James |
| collection | Thesis |
| description | Studies have been conducted in synthesising bridged analogues of estradiol in which the ring D hydroxy group is displaced from the 17-position. The aim was to explore the possible rotational equivalence between such analogues and estr~diol. The synthetic routes investigated were based upon cycloaddition to 3-methoxyestra1,3,5(10), 14, 16-pentaene. In the first phase of the project, two approaches for the synthesis of this diene were explored. The first entailed the vinylogous Shapiro elimination of the tosylhydrazone of 3-methoxyestra-1,3,5(10),15-tetraen-17-one to give the 14,16-diene. The second involved conversion of 3-methoxyestra1,3,5(10), 15-tetraen-17-one into the corresponding dienyl triflate, followed by palladium(0) mediated deoxygenation to afford the 14, 16-diene. Of these two methods, only the latter was successful, as the tosylhydrazone of 3-methoxyestra1,3,5(10), 15-tetraen-17-one could not be synthesised. In the second phase of the work~ cycloaddition of 2-chloroacrylonitrile to the 14,16- diene, followed by alkaline hydrolysis afforded 3-methoxy-14, 17a.-ethenoestra- , 1,3,5(10)-trien-15-one and 3-methoxy-14, l 7a.-ethenoestra-l ,3,5(1 0)-trien-16-one, with the 15-ketone as the major isomer. Treatment of these ketones with LSelectride® afforded 3-methoxy-14, 17a.-ethenoestra-l ,3,5(10)-trien-15P-ol and 3- methoxy-14, 17 a.-ethenoestra-1,3 ,5(1 0)-trien-16P-oL Standard deprotection afforded the corresponding diols which were submitted for biological evaluation. An approach towards the corresponding a-alcohols which was investigated is based upon the Baeyer-Villiger oxidation of 16a.-acetyl-3-methoxy-l 4, 17a.-ethenoestra1,3,5(10)-triene. This compound was obtained as the minor product of the boron trifluoride mediated reaction between the 14, 16-diene and methyl vinyl ketone (MVK). The major compound was formulated 16a.-acetyl-3-methoxy-17P-3'- oxobutyl-14, l 7a.-ethenoestra-1,3,5(10)-triene, on the basis of the available spectral data. Reaction of MVK and the 14,16-diene under thermal conditions afforded the desired 16a.-acetyl compound as the major product. Attempts to perform the peracid mediated insertion ofoxygen were unsuccessful. The final phase of the work w |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/40005 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:50.330Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Department of Chemistry |
| publisherStr | Department of Chemistry |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/40005 Design and synthesis of rotational analogues of estradiol Seymour, Anthony James Bull, J.R Chemistry Studies have been conducted in synthesising bridged analogues of estradiol in which the ring D hydroxy group is displaced from the 17-position. The aim was to explore the possible rotational equivalence between such analogues and estr~diol. The synthetic routes investigated were based upon cycloaddition to 3-methoxyestra1,3,5(10), 14, 16-pentaene. In the first phase of the project, two approaches for the synthesis of this diene were explored. The first entailed the vinylogous Shapiro elimination of the tosylhydrazone of 3-methoxyestra-1,3,5(10),15-tetraen-17-one to give the 14,16-diene. The second involved conversion of 3-methoxyestra1,3,5(10), 15-tetraen-17-one into the corresponding dienyl triflate, followed by palladium(0) mediated deoxygenation to afford the 14, 16-diene. Of these two methods, only the latter was successful, as the tosylhydrazone of 3-methoxyestra1,3,5(10), 15-tetraen-17-one could not be synthesised. In the second phase of the work~ cycloaddition of 2-chloroacrylonitrile to the 14,16- diene, followed by alkaline hydrolysis afforded 3-methoxy-14, 17a.-ethenoestra- , 1,3,5(10)-trien-15-one and 3-methoxy-14, l 7a.-ethenoestra-l ,3,5(1 0)-trien-16-one, with the 15-ketone as the major isomer. Treatment of these ketones with LSelectride® afforded 3-methoxy-14, 17a.-ethenoestra-l ,3,5(10)-trien-15P-ol and 3- methoxy-14, 17 a.-ethenoestra-1,3 ,5(1 0)-trien-16P-oL Standard deprotection afforded the corresponding diols which were submitted for biological evaluation. An approach towards the corresponding a-alcohols which was investigated is based upon the Baeyer-Villiger oxidation of 16a.-acetyl-3-methoxy-l 4, 17a.-ethenoestra1,3,5(10)-triene. This compound was obtained as the minor product of the boron trifluoride mediated reaction between the 14, 16-diene and methyl vinyl ketone (MVK). The major compound was formulated 16a.-acetyl-3-methoxy-17P-3'- oxobutyl-14, l 7a.-ethenoestra-1,3,5(10)-triene, on the basis of the available spectral data. Reaction of MVK and the 14,16-diene under thermal conditions afforded the desired 16a.-acetyl compound as the major product. Attempts to perform the peracid mediated insertion ofoxygen were unsuccessful. The final phase of the work w 2024-06-20T12:51:18Z 2024-06-20T12:51:18Z 1999 2024-06-19T12:43:30Z Thesis / Dissertation Masters Masters http://hdl.handle.net/11427/40005 eng application/pdf Department of Chemistry Faculty of Science |
| spellingShingle | Chemistry Seymour, Anthony James Design and synthesis of rotational analogues of estradiol |
| thesis_degree_str | Master's |
| title | Design and synthesis of rotational analogues of estradiol |
| title_full | Design and synthesis of rotational analogues of estradiol |
| title_fullStr | Design and synthesis of rotational analogues of estradiol |
| title_full_unstemmed | Design and synthesis of rotational analogues of estradiol |
| title_short | Design and synthesis of rotational analogues of estradiol |
| title_sort | design and synthesis of rotational analogues of estradiol |
| topic | Chemistry |
| url | http://hdl.handle.net/11427/40005 |
| work_keys_str_mv | AT seymouranthonyjames designandsynthesisofrotationalanaloguesofestradiol |