Synthesis of Carbohydrate Mimics and Development of a Carbohydrate Epimerisation Method
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
In this thesis the synthesis of several hydrolytically stable carbohydrate mimics with the potential to function as glycosidase or lectin inhibitors are described. This work is presented in Chapters 2-5.
Chapters 2 and 3 describe synthetic efforts for producing carbasugars, and include the first synthesis of 1,2-bis-epi-valienamine and the preparation of two previously known aminocarbasugars. All three compounds were synthesised starting from D-mannose, using ring-closing metathesis as the key step. 1,2-Bis-epi-valienamine was found to inhibit Cellulomonas fimi β-mannosidase with a Ki value of 140 mM. Also included is the development of a novel synthetic route from cheap D-fructose to three mannose-mimicking carbasugars using a ring-closing metathesis strategy. Two of the compounds are potential inhibitors of the FimH adhesin.
In Chapters 4 and 5 the synthesis of a number of pseudodisaccharides are presented; valienamine- and epi-valienamine-containing pseudodisaccharides and a small library of S-linked pseudodisaccharides were prepared. Various synthetic strategies were explored, including an alkylation strategy, Mitsunobu couplings, and sulfonate displacements. This is the first report on the synthesis of a valienamine pseudodisaccharide with β-lyxo-configuration. Two of the S-linked pseudodisaccharides were found to bind to Concanavalin A with high affinity.
The final chapter (Chapter 6) of this thesis focuses on the development of a carbohydrate epimerisation method using transition metal catalysis. Two equilibrium constants involving gluco/manno- and gluco/allo-alcohols were determined via this method.
Place, publisher, year, edition, pages
Stockholm: Department of Organic Chemistry, Stockholm University , 2010. , 92 p.
Carbohydrate Mimic, Ring-closing Metathesis, Carbohydrate Chemistry, Carbasugar, Aminocarbasugar, Pseudodisaccharide, Glycosidase and Lectin Inhibitors
Research subject Organic Chemistry
IdentifiersURN: urn:nbn:se:su:diva-45855ISBN: 978-91-7447-170-0OAI: oai:DiVA.org:su-45855DiVA: diva2:370039
2010-12-15, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (English)
Madsen, Robert, Professor
Cumpstey, Ian, Docent
At the time od doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 3: Manuscript. Paper 5: Manuscript.2010-11-232010-11-152010-12-06Bibliographically approved
List of papers