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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 derivados de chalconas e de 2-quinolinonas visando a busca por inibidores das enzimas cruzaína e da família BET bromodomain / Synthesis of chalcone and 2-quinolinone derivatives towards the development of new cruzain and BET bromodomain enzyme inhibitors

Vieira, Lucas Campos Curcino 12 September 2014 (has links)
Made available in DSpace on 2016-06-02T20:34:55Z (GMT). No. of bitstreams: 1 6228.pdf: 15112297 bytes, checksum: 74610acef15a4b7ec7b835eff728f13f (MD5) Previous issue date: 2014-09-12 / Universidade Federal de Minas Gerais / The first part of this work involved the synthesis of chalcone derivatives towards the development of inhibitors of the enzyme cruzain from Trypanosoma cruzi. Different green chemistry approaches were employed to functionalize chalcones as the use of alternative solvents as well as source of energy. A new Suzuki cross-coupling methodology for synthesis of functionalized chalcones was developed, employing PEG-400 as solvent under microwave irradiation. The use of organocatalysis in the 1,4-addition of α,α-dicyanoolefins to α,β- unsaturated carbonyl system provided products with good yields and excellent enantiomeric excess. It was also developed a new synthetic route for the synthesis of γ-butenolides from chalcones. The key step was accomplished using montmorillonite K10 clay as catalyst and ethanol as solvent... (CONTINUE) / A primeira parte deste trabalho teve como objetivo a síntese de derivados de chalconas visando a busca por inibidores da enzima cruzaína de Trypanossoma cruzi, causador da Doença de Chagas. Foram abordadas reações químicas para a funcionalização de chalconas empregando princípios de química verde como o uso de fonte de energia e solventes alternativos. Foi desenvolvida uma nova metodologia de acoplamento cruzado de Suzuki para a síntese de chalconas funcionalizadas, empregando PEG-400 como solvente sob irradiação de micro-ondas. O emprego da organocatálise na adição de α,α- dicianoolefinas ao sistema carbonílico α,β-insaturado forneceu produtos com bons rendimentos e ótimos excessos enantioméricos. Foi também elaborada uma nova rota sintética para a síntese de γ-butenolídeos, partindo de chalconas. A última etapa reacional foi realizada utilizando a argila montmorillonite K10 como catalisador e etanol como solvente... (CONTINUA)

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