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Asymmetric Synthesis of Iridoid Derivatives Using Resolved 2-Phenylindoline as a Chiral Auxiliary
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry.
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2008 (English)In: European Journal of Organic Chemistry, ISSN 1434-193X, E-ISSN 1099-0690, no 35, 5915-5921 p.Article in journal (Refereed) Published
Abstract [en]

An asymmetric synthetic route to cis,cis-nepetalactol (component of the sex pheromone for the hop aphid, Phorodon humuli) is presented. 2-Phenylindoline was resolved to provide a chiral auxiliary for the cycloaddition of oxocitral. The resolution was made by chromatographic separation of the diastereomers of the urea derivative made from 2-phenylindoline and with (R)-(+)-alpha-methylbenzyl isocyanate, followed by reductive cleavage of the isolated diasteromers using diborane. The cycloaddition of oxocitral using (S)-2-phenylindoline yielded an enantiopure product after chromatography. Hydrolysis of the cycloaddition adduct yielded gastrolactol (3). As gastrolactol is a versatile synthon for the synthesis of iridoids, the overall procedure provides a general asymmetric route to elaborated iridoids.

Place, publisher, year, edition, pages
2008. no 35, 5915-5921 p.
Keyword [en]
Iridoid, Cycloaddition reaction, Nepetalactol, Chromatographic resolution, 2-Phenylindoline
National Category
Organic Chemistry
URN: urn:nbn:se:kth:diva-34128DOI: 10.1002/ejoc.200800440ISI: 000261941500006ScopusID: 2-s2.0-56749088092OAI: diva2:419569
QC 20110527Available from: 2011-05-27 Created: 2011-05-26 Last updated: 2011-05-27Bibliographically approved

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Santangelo, Ellen M.Liblikas, IlmeNorrby, Per-OlaUnelius, C. Rikard
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