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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Síntese de 2-(1H-1,2,3-triazol)-1,4-naftoquinona de O-glicosídeos 2,3-insaturados com potencial antitumoral

MELO, Valentina Nascimento e 30 March 2015 (has links)
Submitted by (lucia.rodrigues@ufrpe.br) on 2017-02-15T15:25:59Z No. of bitstreams: 1 Valentina Nascimento e Melo.pdf: 1846879 bytes, checksum: 0f435fbf6eac1935724bc84cb61e7e68 (MD5) / Made available in DSpace on 2017-02-15T15:25:59Z (GMT). No. of bitstreams: 1 Valentina Nascimento e Melo.pdf: 1846879 bytes, checksum: 0f435fbf6eac1935724bc84cb61e7e68 (MD5) Previous issue date: 2015-03-16 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / Two strategies were considered for the synthesis of 2,3-unsaturated O-glucosyl-1,2,3-triazoles. The reaction between tri-O-acetyl-D-glucal and triazole alcohols gave no stereoselectivity. In fact, β-isomer formation was increased. A second strategy furnished 2,3-unsaturated O-glucosides from tri-O-acetyl-D-glucal and alkynols via Ferrier rearrangement; this methodology employing montmorillonite K-10 doped with FeCl3∙6H2O affords new glycosides in good to excellent yields, short time and high α-stereoselectivity in dichloromethane. Subsequently, the glucosides were coupled with 2-azido-1,4-naphthoquinone to give a new series of 1,2,3-1H-triazolyl O-glucoside derivatives based on click reaction. / Duas estratégias foram consideradas para a síntese de 1,2,3-triazóis O-glicosídeos2,3-insaturados. A reação entre o tri-O-acetil-D-glucal e os alcoóis triazólicos não mostrou seletividade. De fato, a formação do isômero β foi aumentada. Uma segunda estratégia forneceu O-glicosídeos 2,3-insaturados a partir do tri-O-acetil-D-glucal e alquinóis via rearranjo de Ferrier; esta metodologia formou novos glicosídeos, empregando montmorilonite K-10 dopado com FeCl3∙6H2O em diclorometano, em rendimentos de bons à excelentes, baixo tempo reacional e alta α-estereosseletividade. Subsequentemente, os glicosídeos foram acoplados com 2-azido-1,4-naftoquinona formando uma nova série de derivados 1,2,3-1H-triazolil O-glicosídeos através da reação Click.
2

Enantioselektive Darstellung bioaktiver Flavanone

Witt, Morris 01 July 2014 (has links) (PDF)
Diese Dissertation beschreibt die Synthese der vier Flavanone Lonchocarpol A, 6-Dimethylallylnaringenin, Glabrol und Euchrenon A7. Des weiteren konnten drei dieser Naturstoffe enantiomerenrein mit Hilfe einer kinetischen Racematspaltung hergestellt werden. Dabei wurden die Carboxylkohlenstoffe selektiv mit einer asymmetrischen Transferhydrierung nach Noyori reduziert.
3

Enantioselektive Darstellung bioaktiver Flavanone

Witt, Morris 15 January 2014 (has links)
Diese Dissertation beschreibt die Synthese der vier Flavanone Lonchocarpol A, 6-Dimethylallylnaringenin, Glabrol und Euchrenon A7. Des weiteren konnten drei dieser Naturstoffe enantiomerenrein mit Hilfe einer kinetischen Racematspaltung hergestellt werden. Dabei wurden die Carboxylkohlenstoffe selektiv mit einer asymmetrischen Transferhydrierung nach Noyori reduziert.

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