Síntese de trifluormetil-cicloalca[d]-2(1h)-pirimidinonas e tiopirimidinonas
Ano de defesa: | 2004 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
BR Química UFSM Programa de Pós-Graduação em Química |
Programa de Pós-Graduação: |
Não Informado pela instituição
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Departamento: |
Não Informado pela instituição
|
País: |
Não Informado pela instituição
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Palavras-chave em Português: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/10423 |
Resumo: | This work describes the synthesis and identification of a serie of 4-trifluoromethylcycloalca[d]-2-(1H)-(thio)pyrimidinones, from the cyclocondensation reactions of 2-trifluoroacetylmethoxycycloalkenes with urea and thiurea. The 2-trifluoroacetylmethoxycycloalkenes were obtained from trifluoroacetylation of acetals derived from cycloalkanones. From this procedure, eight 2-trifluoroacetylmethoxycycloalkenes were obtained in good yields (60-70%), being that five are unpublished in literature. The cyclocondensation reaction using 2-trifluoroacetylmethoxycycloalkenes and urea or thiurea an carried out in alcoholic half under reflux, for 20 hours, catalysed by BF3.OEt2, leading to the products in 10-65% yields. The structural analyses of 2-trifluoroacetylmethoxycycloalkenes and 4- trifluoromethyl-cycloalca[d]-2-(1H)-(thio)pyrimidinones obtained were characterized by NMR 1H, 13C, CG/MS and elemental analysis. Still, were preliminary studies of NMR 17O for the 2-trifluoroacetylmethoxycycloalkenes. |