Buscar
Itens para a visualização no momento 1-10 of 11
Reações de 1,1,1-tricloro-4-metoxi-3-penten-2-ona com hidrazinas monosubstituídas
(Universidade Federal de Santa Maria, 2005-02-18)
The 1,1,1-trichloro-4-methoxy-3-penten-2-ona (CCl3COCH=CHOMe) reaction with hydrazines series (RNHNH2, where R = H, Me, tert-Bu, Ph, Ph(F)5, Ph-4-NO2, CO2Me e CONH2) yield to the pyrazoles N-substituted and derivatives ...
Reações de ciclocondensação de cianoacetoidrazida com enonas halometil-substituídas
(Universidade Federal de Santa Maria, 2008-02-22)
The synthesis of thirteen 3-(R1), 4-(R2) and 5-(R3)-substituted 1-cyanoacetyl-5-hydroxy-4,5-dihydro-1H-pyrazoles from the cyclocondensation reaction of 4-alkoxy-3-alken-2-ones [R3C(O)C(R2)=C(R1)(OR), where R3 = CF3,
CCl3, ...
Síntese de 5-hidróxi-3-(1,1-dimetoxietan-2-il)-5-trifluormetil-2-pirazolinas e 3-(1,1-difluoretan-2-il)-1H-pirazóis análogos
(Universidade Federal de Santa Maria, 2008-02-01)
This work describes, at first, the synthesis of 4,6,6-trimethoxy-1,1,1-trifluorohex-3-en-2-one by the acylation reaction of 1,1,3,3-tetramethoxybutane, in 65% yields.
Afterwards, the synthesis of a new series of ...
Acilenaminonas: síntese e aplicação na obtenção de pirazóis, pirazolo[3,4-d]piridazinonas e pirazolo[1,5-a]pirimidinas
(Universidade Federal de Santa Maria, 2009-05-19)
The regioespecific synthesis of a series of 14 N-acylated enaminones (52-88%) from the acylation reaction of secondary β-enamino ketones [RC(O)CH=CHNR1R2; R = Ph, 4-
FC6H4, 4-NO2C6H4, thien-2-yl, CCl3, CF3; R1 = H; R2 = ...
Síntese de alguns Pirazóis derivados do 3-trifluoracetil-4,5-diidrofurano e 3-trifluoracetil-5,6-diidro-4H-pirano
(Universidade Federal de Santa Maria, 2009-02-26)
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 ...
5-Hidróxi-4,5-Diidro-1h-1-(2-hidroxibenzoil)pirazóis: planejamento, síntese e analgesia
(Universidade Federal de Santa Maria, 2007-02-23)
An efficient method to obtain six 4-alkoxy-2-oxo-but-3-enoic acid ethyl esters [EtO2CC(O)C(R2)=C(R1)OR, where R1/R2/R = Me/H/Me (2a), Ph/H/Me (2b), 4-MeC6H4/H/Me (2c), 4-BrC6H4/H/Me (2d), 4-FC6H4/H/Me (2e), H/Me/Et (2f)] ...
5-trialometil-4,5-diidro-1h-1-(carbonilpiridil)pirazóis: síntese e atividade biológica frente ao Mycobacterium tuberculosis
(Universidade Federal de Santa Maria, 2008-08-06)
This work describes the synthesis of series of 5-hydroxy-3-[alkyl(aryl/heteroaryl)]-5-trifluoro[chloro]methyl-4,5-dihydro-1H-1(carbonylpyridyl)pyrazoles, obtained from the
reactions of 1,1,1-trihalo-4-[alkyl(aryl/hetero ...
Uso de energia microondas na síntese de enonas e de 4,5-diidropirazóis trialometil-substituídos
(Universidade Federal de Santa Maria, 2007-08-17)
The solvent-free microwave-assisted regiospecific synthesis of a series of 5-trihalomethyl-4,5-dihydro-1H-pyrazole (7 - 10) from the cyclocondensation of 1,1,1-
trihalo-4-alkoxy-3-alken-2-ones (5 - 6),[ CX3COC(R)2=C(R)1OR, ...
Líquidos iônicos: aplicação na síntese de β-dimetilaminovinil cetonas e na N-alquilação de pirazóis
(Universidade Federal de Santa Maria, 2007-02-15)
The synthesis of two 1-methyl-3-alkylimidazolium tetrafluoroborate (where alkyl = butyl, octyl; [BMIM]BF4 and [OMIM]BF4) based on room temperature ionic
liquids (RTIL) is reported. The usefulness of these ionic liquids ...
Síntese e investigação da atividade biológica de pirazóis funcionalizados
(Universidade Federal de Santa Maria, 2006-08-16)
In this work, a method for the synthesis of a series of heterocyclic compounds that preserve the amino group of the starting material, is presented. For this study, a-oxoketene O,N-acetals were obtained from the reaction ...