Change search
ReferencesLink to record
Permanent link

Direct link
Amino Alcohols from Asymmetric Transfer Hydrogenation of α-Amido-β-Keto Esters Possessing Olefins: Formal Total Synthesis of Sphingosine
KTH, School of Chemical Science and Engineering (CHE).
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis a methodology to synthesize anti-β-hydroxy-α-amino esters possessing olefins has been investigated. The developed procedures originate from two already established procedures in which α-amido-β-keto esters, which do not contain olefins, has been stereoselectively reduced to the corresponding anti-β-hydroxy-α-amino alcohols via asymmetric transfer hydrogenation coupled with dynamic kinetic resolution. Both established methods, one solvent free and one emulsion procedure, have been investigated on the expanded substrate scoop. Four different α-amido-β-keto ester containing olefins were tested and it was found that the ketones were reduced to desired anti-β-hydroxy-α-amino esters in both procedures, but also side products were formed where the olefins were reduced. The ratio of the different products was dependent on the structure of the starting α-amido-β-keto ester, ligand used on the catalyst and reaction conditions such as number of equivalents of base and reaction temperature. The diastereoselectivity for the desired products was in favor of the anti stereoisomer, however, the dr was worse than in the established procedures. The usefulness of this methodology was then demonstrated by a formal total synthesis of Sphingosine.

Place, publisher, year, edition, pages
2012. , 39 p.
Keyword [en]
Asymmetric transfer hydrogenation, asymmetric catalysis, anti-β-hydroxy-α-amino ester, Sphingosine, cross metathesis
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-156316OAI: diva2:766179
Available from: 2014-11-26 Created: 2014-11-26 Last updated: 2014-11-26Bibliographically approved

Open Access in DiVA

fulltext(2370 kB)84 downloads
File information
File name FULLTEXT01.pdfFile size 2370 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
School of Chemical Science and Engineering (CHE)
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 84 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 43 hits
ReferencesLink to record
Permanent link

Direct link