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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 alguns Pirazóis derivados do 3-trifluoracetil-4,5-diidrofurano e 3-trifluoracetil-5,6-diidro-4H-pirano. / Synthesis of some Pyrazoles derived of 3-Trifluoroacetyl-4,5- dihydrofurane and 3-Trifluoroacetyl-5,6-dihydro-4H-pyrane

Bencke, Carlos Eduardo 26 February 2009 (has links)
Conselho Nacional de Desenvolvimento Científico e Tecnológico / This work presents a simple and versatile strategy for the synthesis of new 4 and N-sustituted 5-trifluoromethyl-pyrazoles. These compounds were obtained by the reaction of 3-trifluoroacetyl-4,5-dihydrofuran and 3-Trifluoroacetyl-5,6-dihydro-4Hpyran with heteroaryl(aryl/alkyl)hydrazines (RNHNH2, where R= COCH₂CN, (4- Py)CO, (3-Py)CO, 4-Py(2-Cl)CO e (4-SO₂NH₂)Ph), in the presence of trifluoroboroetherete in methanol, furnishing the respective 5-trifluoromethyl-4-alkyl-1N-sustitutedpyrazoles, in moderate yields (17-59%). The pyrazoles obtained in this study were identified by NMR 1H, NMR 13C and Mass Espectroscopy. / Este trabalho apresenta uma estratégia sintética simples e versátil para a preparação de uma série inédita de 5-trifluormetilpirazóis 4 e 1N-substituídos. Os pirazóis foram obtidos a partir da reação do 3-trifluoracetil-4,5-diidrofurano e 3-trifluoracetil-5,6-diidro-4H-pirano com heteroaril(aril/alquil)hidrazinas (RNHNH2, onde R= COCH₂CN, (4-Py)CO, (3-Py)CO, 4-Py(2-Cl)CO e (4-SO₂NH₂)Ph), com a presença de trifluorboro eterato em metanol, produzindo os respectivos pirazóis 5- trifluormetil-4-alquil-1N-substituídos com rendimentos moderados (17-59%). Os pirazóis obtidos neste trabalho foram identificados por Ressonância Magnética Nuclear de Hidrogênio, Ressonância Magnética Nuclear de Carbono-13 e Espectroscopia de Massas.

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