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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

5,8-Dimetoxisoquinolina como intermediário sintético versátil : síntese total das caulibugulonas A, B, C e D e da isoelipticina / 5,8-Dimethoxyisoquinoline as a versatile synthetic intermediate : total synthesis of caulibugulones A, B, C and D and isoellipticine

Naciuk, Fabrício Fredo, 1976- 26 August 2018 (has links)
Orientador: Paulo Cesar Muniz de Lacerda Miranda / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química / Made available in DSpace on 2018-08-26T08:46:40Z (GMT). No. of bitstreams: 1 Naciuk_FabricioFredo_D.pdf: 5766349 bytes, checksum: f8a483081babf6f2f69d11fe85cf43ec (MD5) Previous issue date: 2014 / Resumo: No presente trabalho, foi estudada a preparação da 5,8-dimetoxisoquinolina através de um expediente baseado na reação de Pomeranz-Fritsh. Na etapa de ciclização deste protocolo foi empregada a N-(2,5-dimetoxibenzil)-2,2-dimetoxietanamina, além de seus dois derivados com o nitrogênio protegido (grupo tosila ou nosila). O núcleo isoquinolíco foi preparado em quatro etapas, a partir de matérias comercialmente disponíveis, com 90% de rendimento. Posteriormente, a 5,8-dimetoxisoquinolina foi submetida à desproteção oxidativa, mediada por NBS ou ácidos trialoisocianúricos, seguida de uma etapa de aminação/oxidação. Assim, quatro produtos naturais foram preparados: as caulibugulonas A e D em cinco etapas e com rendimentos globais de 50% e 26% respectivamente e as caulibugulonas B e C em seis etapas com rendimentos globais de 31% e 61% respectivamente. Ainda, baseado nos estudos de obtenção das caulibugulonas A-D, foi possível preparar dois intermediários sintéticos, a 6-cloro-7-(fenilamino)isoquinolino-5,8-diona e a 7-(fenilamino)isoquinolino-5,8-diona) com rendimentos de 79% (duas etapas) e 45% (one-pot), respectivamente, a partir da isoquinolina. Na sequência, através de ciclização intramolecular promovida por fonte de paládio, a 5H-pirido[3,4-b]carbazol-5,11(10H)-diona foi preparada com 65% de rendimento a partir da 7-(fenilamino)isoquinolino-5,8-diona (via ativação C-H) ou com 50% de rendimento a partir da 6-cloro-7-(fenilamino)isoquinolino-5,8-diona (via arilação direta). Assim, após reações de metilação/redução, a isoelipticina foi preparada com 18% de rendimento global em nove etapas / Abstract: In the present work, the preparation of 5,8-dimethoxyisoquinoline was studied through an expedient based on the reaction of Pomeranz-Fritsh. In the cyclization step of this protocol was applied to N-(2,5-dimethoxy)-2,2-dimethoxyethanamine in addition to their two derivatives with protected nitrogen (nosyl or tosyl group). The isoquinolic core was prepared in four steps from commercially available materials, with 90% yield. Later 5,8-dimethoxyisoquinoline, was subjected to oxidative deprotection, mediated by NBS or trihaloisocyanuric acids, followed by one amination/oxidation step. Thus, the four natural products have been prepared: caulibugulones A and D in five steps and 50% and 26%, overall yield, respectively, and caulibugulones B and C in six steps with overall yields of 31% and 61% respectively. Also, based on studies by obtaining the caulibugulones A-D, it was possible to prepare two synthetic intermediates: 6-chloro-7-(phenylamino)-isoquinoline-5,8-dione and 7-(phenylamino)-isoquinoline-5,8-dione with 79% (two steps) and 45% (one-pot) yield, respectively, from the isoquinoline. Following, through intramolecular cyclization promoted by a source of palladium, 5H-pyrido[3,4-b]carbazole-5,11(10H)-dione was prepared in 65% yield from 7-(phenylamino)isoquinoline-5,8-dione (via C-H activation) or 50% yield from 6-chloro-7-(phenylamino)-isoquinoline-5,8-dione (via direct arylation). Thus, after methylation/reduction reactions, isoellipticine was prepared in 18% overall yield in nine steps / Doutorado / Quimica Organica / Doutor em Ciências

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