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Synthesis of chiral secondary amines useful as organocatalysts
Urban, Michal ; Veselý, Jan (advisor) ; Drahoňovský, Dušan (referee)
This bachelor thesis deals with the preparation of chiral secondary amines, which are used as catalysts in many chemical transformations leading to enantimerically pure compounds. The emphasis of this work is placed on the comparison of the effectiveness of published syntheses those organocatalysts. The first part focuses on the comparison of efficiency and optimization of two methods of preparation Jørgensen's catalyst, the first approach is based on the Z-protected (S)-proline, and in the second approach as starting material was used. The second part deals with the preparation of other Jørgensen's and Hayashi's types of catalysts, via introduction of various silyl functional groups.
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Enantioselective synthesis of fluorinated organic compounds using iminium and enamine catalysis
Hejnová, Monika ; Veselý, Jan (advisor) ; Smrček, Stanislav (referee)
This diploma thesis deals with the scope of organocatalytic concept for the preparation of enantiomerically pure organic compounds, containing fluorine atom. Our attention was focused on the use of easily available α,β-unsaturated aldehydes and ketones as starting materials and commercially available secondary amines as catalysts. The first part of the work is dedicated to the enantioselective cyclization reaction of hydrazone (24) with cyclohex-2-enone (25). The second part describes a study of enantioselective nucleophilic addition of diethyl 2-fluoromalonate (31a) to α,β-unsaturated aldehydes (30) via enamine activation.
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Synthesis of chiral secondary amines useful as organocatalysts
Urban, Michal ; Veselý, Jan (advisor) ; Drahoňovský, Dušan (referee)
This bachelor thesis deals with the preparation of chiral secondary amines, which are used as catalysts in many chemical transformations leading to enantimerically pure compounds. The emphasis of this work is placed on the comparison of the effectiveness of published syntheses those organocatalysts. The first part focuses on the comparison of efficiency and optimization of two methods of preparation Jørgensen's catalyst, the first approach is based on the Z-protected (S)-proline, and in the second approach as starting material was used. The second part deals with the preparation of other Jørgensen's and Hayashi's types of catalysts, via introduction of various silyl functional groups.
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Enantioselective synthesis of fluorinated organic compounds using iminium and enamine catalysis
Hejnová, Monika ; Veselý, Jan (advisor) ; Smrček, Stanislav (referee)
This diploma thesis deals with the scope of organocatalytic concept for the preparation of enantiomerically pure organic compounds, containing fluorine atom. Our attention was focused on the use of easily available α,β-unsaturated aldehydes and ketones as starting materials and commercially available secondary amines as catalysts. The first part of the work is dedicated to the enantioselective cyclization reaction of hydrazone (24) with cyclohex-2-enone (25). The second part describes a study of enantioselective nucleophilic addition of diethyl 2-fluoromalonate (31a) to α,β-unsaturated aldehydes (30) via enamine activation.
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