Sökning: "diastereoselectivity"

Visar resultat 1 - 5 av 30 avhandlingar innehållade ordet diastereoselectivity.

1. 1. Synthesis and binding studies of 9,10-disubstituted anthracene and dibenzobarrelene-based receptors for recognition of carbohydrates in water

   Författare :Hans Grundberg; Centrum för analys och syntes; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organisk kemi; 2- trimethylsilyl ethyl sulfide; diastereoselectivity; water; carbohydrates; recognition; biomimetic; Artificial; receptor; Organic chemistry;

   Sammanfattning : Artificial, amfiphilic, and biomimetic receptors soluble in water were synthesized via attaching polar amino acids to hydrophobic back-bones possessing a surface suitable for hydrophobic interactions. The hydrophobic back-bones chosen in this thesis were anthracene and dibenzobarrelene structures. LÄS MER

3. 2. Addition of organocuprates to enoates : a mechanistic and synthetic study

   Författare :Beritte Christenson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 13C labelled; TMSX; NMR spectroscopy; diastereoselectivity; solvent effects; pi-complex; enoates; lithium diorganocuprates; conjugate addition;

   Sammanfattning : .... LÄS MER

4. 3. Enzymes as catalysts in synthesis of enantiomerically pure building blocks : secondary alcohols bearing two vicinal stereocenters

   Författare :Rong Liu; Hans-Erik Högberg; Torbjörn Norin; Thorleif Anthonsen; KTH; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; enzyme; kinetic resolution; enantioselectivity; lipase; diastereoselectivity; epimerisation; metal-catalysed transformation; intramolecular alkylation.; Chemistry; Kemi;

   Sammanfattning : Enzymes as tools in organic synthesis have provided enormous advantages. This thesis deals with the applications of enzymes in the kinetic resolutions of racemic compounds. The stereochemistry of chiral compounds and the kinetics of α/β hydrolase lipases are presented. LÄS MER

5. 4. Synthesis of Tetrahydrofuran and Pyrrolidine Derivatives Utilising Radical Reactions : Organochalcogenides in Reductive, Carbonylative and Group-Transfer Cyclisation

   Författare :Cecilia Ericsson; Lars Engman; Ilhyong Ryu; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; Organisk kemi; Organic chemistry; Organisk kemi;

   Sammanfattning : This thesis describes free-radical reactions for the construction of tetrahydrofuran and pyrrolidine derivatives. The studies are concerned with (i) diastereoselectivity in radical cyclisation, (ii) construction of tetrahydrofuran-3-ones and pyrrolidin-3-ones via radical carbonylation/cyclisation and (iii) synthesis of tetrahydrofuran derivatives via group-transfer cyclisation of organochalcogen compounds. LÄS MER

7. 5. Highly enantioselective synthesis of lactam and sugar derivatives by chiral aminocatalysis and merging with transition metal catalysis

   Författare :Zhang Kaiheng; Armando Cordova; Malkov Andrei; Mittuniversitetet; []
   Nyckelord :;

   Sammanfattning : This thesis presented novel methodologies for enantioselectivesynthesis of highly functionalized lactam and sugar derivatives.Asymmetric organocatalysis, cooperative dual catalysis and one-pot multicomponent reaction strategies were applied for the construction of continuous and quaternary stereogenic center. LÄS MER