dc.contributor.author |
Brimble, Margaret |
en |
dc.contributor.author |
Prabaharan, H |
en |
dc.date.accessioned |
2011-09-19T00:06:11Z |
en |
dc.date.issued |
1999 |
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dc.identifier.citation |
Journal of the Chemical Society, Perkin Transactions 1 (19):2795-2801 1999 |
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dc.identifier.issn |
1470-4358 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/8043 |
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dc.description.abstract |
The synthesis of tetracyclic polyethers 16 and 17, which are closely related to the polyether antibiotics epi-17-deoxy-(O-8)-salinomycin 3 and CP44,161 4, is described. The key step involved Barbier–Grignard addition of bromide 8 to bis-spiroacetal aldehyde 7a which proceeded via chelation control to provide erythro alcohol 9a as the major product. Addition of the Grignard reagent derived from bromide 8 to the isomeric bis-spiroacetal aldehydes 7b,7c,7d also afforded erythro alcohols 9b,9c,9d, respectively as the major products. A rationale for this observed stereoselectivity is provided. Attempts to effect iodoetherification of alkene 9a resulted in decomposition of the sensitive bis-spiroacetal ring system, however, epoxidation followed by acid catalyzed cyclization of the resultant epoxides 14,15 afforded bis-spiroacetal tetrahydrofurans 16,17. Attempts to effect ring expansion of tetrahydrofuran alcohols 16,17 to tetrahydropyrans 18,19 were unsuccessful. |
en |
dc.language |
EN |
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dc.relation.ispartofseries |
Journal of the Chemical Society, Perkin Transactions 1 |
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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 |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
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dc.subject |
POLYETHER ANTIBIOTIC SALINOMYCIN |
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dc.subject |
STEREOCONTROLLED TOTAL SYNTHESIS |
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dc.subject |
NATURAL-PRODUCTS |
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dc.subject |
CHIRAL SYNTHESIS |
en |
dc.subject |
C18-C30 SEGMENTS |
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dc.subject |
D-GLUCOSE |
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dc.subject |
MAGNESIUM |
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dc.subject |
C10-C17 |
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dc.subject |
C1-C9 |
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dc.title |
Addition of a Grignard reagent to bis-spiroacetal aldehydes: appendage of a tetrahydrofuran ring |
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dc.type |
Journal Article |
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dc.identifier.doi |
10.1039/A905339E |
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pubs.issue |
19 |
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pubs.begin-page |
2795 |
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dc.rights.holder |
Copyright: 1999 The Royal Society of Chemistry |
en |
pubs.end-page |
2801 |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Article |
en |
pubs.elements-id |
1845 |
en |
pubs.org-id |
Science |
en |
pubs.org-id |
Chemistry |
en |
pubs.org-id |
Science Research |
en |
pubs.org-id |
Maurice Wilkins Centre (2010-2014) |
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pubs.record-created-at-source-date |
2010-09-01 |
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