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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 total das basiliskamidas A e B e síntese do fragmento C1-C9 da dictiostatina / Total synthesis of basiliskamides A and B and of C1-C9 fragment of (-)-dictyostatin

Gonçalves, Caroline da Costa Silva 03 April 2010 (has links)
Orientador: Luiz Carlos Dias / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química / Made available in DSpace on 2018-08-16T12:55:57Z (GMT). No. of bitstreams: 1 Goncalves_CarolinedaCostaSilva_D.pdf: 6751607 bytes, checksum: 9bd088f8ddc948d84afa9c74d3c1b9bd (MD5) Previous issue date: 2010 / Resumo: Síntese Total das Basiliskamidas A e B: As basiliskamidas A e B são agentes antifúngicos isolados em 2002 por Anderson e colaboradores, a partir de uma cultura de bactérias marinhas Bacillus laterosporus (MK-PNG-276). Nesta primeira parte do trabalho, descrevemos a síntese total das basiliskamidas A e B. As basiliskamidas A e B são oriundas de um intermediário comum, o diol 1.4. As etapas chave incluem uma reação aldólica do tipo anti, mediada por (CHx)2B e uma reação de redução diastereosseletiva sob as condições de Narasaka. A basiliskamida B (1.2) foi obtida em 12 etapas e 6% de rendimento global e a basiliskamida A (1.1) em 14 etapas e 2,5% de rendimento global, a partir da etilcetona 1.47 (considerando a rota linear mais longa para ambas).Síntese do Fragmento C1-C9 da (-)-Dictiostatina (2.1): A (-)-dictiostatina (2.1) é uma macrolactona com potente atividade antitumoral, isolada em 1994 por Pettit e colaboradores, a partir da esponja marinha Spongia sp. e, posteriormente por Wright e co-autores a partir da esponja da família Corallistidea. Nesta segunda parte do trabalho, descrevemos a síntese do fragmento C1-C9 da (-)-dictiostatina (2.1). Os centros esterogênicos em C6 e C7 foram construídos através de uma reação de epoxidação enantiosseletiva de Sharpless seguido da abertura regio e diastereosseletiva do epóxido com Me2CuCNLi2. O fragmento C1-C9 (2.103) foi obtido em 13 etapas e 5% de rendimento global a partir do álcool 2.115, considerando a rota linear mais longa. / Abstract: Total Synthesis of Basiliskamides A and B: Basiliskamides A and B are antifungal agents isolated by Andersen and co-workers in 2002 from the marine bacterium Bacillus laterosporus (MK-PNG-276). The first chapter describes the total synthesis of basiliskamides A and B. Basiliskamides A and B were prepared from a common intermediate, 1,3-diol 1.4. Notable features of this approach include an anti-aldol reaction and a diastereoselective reduction using Narasaka's methodology. Basiliskamide B (1.2) was obtained in 12 steps and 6% overall yield and basiliskamide A (1.1) was prepared in 15 steps and 2.5% overall yield from ethyl ketone 1.47. Synthesis of C1-C9 fragment of (-)-Dictyostatin (2.1): The macrolactone (-)-dictyostatin (2.1) showed potent growth inhibition against a range of human cancer cells lines. This compound was isolated from the marine sponge Spongia sp by Petit and co-workes in 1994 and from Corallistidea sponges in 2001 by Wright and co-workers. The second chapter describes the synthesis of C1-C9 fragment of (-)-dictyostatin (2.1). The two stereocenters (C6 and C7) were created via a Sharpless's epoxidation followed by a diastereoselective epoxide opening mediated by Me2CuCNLi2. The synthesis of C1-C9 (2.103) fragment was achieved after 13 steps in 5% overall yield starting from alcohol 2.115. / Doutorado / Quimica Organica / Doutor em Ciências

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