Pyrrol
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Klein’s Remdesivir-Nucleobase Synthesis Revisited: Chemoselective Cyanation of Pyrrol-2-carboxaldehyde
4-Aminopyrrolo[2,1-f][1,2,4]triazine is a fundamental raw material in the synthesis of remdesivir, which demand has increased due to the tests and potential repositioning of this drug against Coronavirus disease 2019 (COVID-19). Here, three chemical steps route for the preparation of remdesivir’s nucleobase is described. Particularly, a highly chemoselecti
J. Braz. Chem. Soc.. Publicado em: 2021-07
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2. Property-based design and synthesis of new chloroquine hybrids via simple incorporation of 2-imino-thiazolidin-4-one or 1h-pyrrol-2, 5-dione fragments on the 4-amino-7-chloroquinoline side chain
No presente trabalho realizou-se a síntese de novos N-derivados da 4-amino-7-cloroquinolina modificando seletivamente o grupo amino terminal das N-(7-cloroquinolin-4-il)-alquildiaminas, a base do fármaco cloroquina (CQ) mediante a incorporação de sistemas heterocíclicos da 2-imino-tiazolidin-4-ona e 1H-pirrol-2,5-diona. Esses derivados foram selecionado
Journal of the Brazilian Chemical Society. Publicado em: 2011-09
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3. Design, synthesis and evaluation of biological derivatives pyrroles potentially antiinflamatory activity / Planejamento, síntese e avaliação biológica de derivados pirrólicos com potencial atividade antiinflamatória
The nonsteroidal antiinflammatory drugs (NSAIDs) are among the most prescribed and used drugs in the world. These drugs inhibit the cyclooxygenases, enzymes responsible for conversion of arachidonic acid into phlogistic prostaglandins, by the action of phospholipase A2. The synthesis of compounds containing pyrrole nucleus in their structures has been a topi
Publicado em: 2009
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4. SÍNTESE DE 1H-PIRAZÓIS USANDO IRRADIAÇÃO DE ULTRA-SOM E DE 2-PIRROLONAS DERIVADAS DO ÁCIDO LEVULÍNICO / SYNTHESIS OF 1H-PYRAZOLES BY ULTRASOUND IRRADIATION AND 2-PYRROLONES DERIVATED FROM LEVULINIC ACID
This work describes the synthesis of 4,5-dihydropirazoles through a sonochemical methodology, from the reaction of cyclocondensation of 1,3-diaryl-2-propen-1-ones with aminoguanidine hydrochloride and thiosemicarbazide. These reactions were carried out in ethanol in periods of reduced time concerning to the methods described in the literature. Then, it prese
Publicado em: 2008
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5. Pyrazolo[1,5-a]pirimidines : Synthesis and Bromation / PIRAZOLO[1,5-a]PIRIMIDINAS: SÍNTESE E BROMAÇÃO
The synthesis of a series of 2-methyl-7-trichloromethylpyrazolo[1,5-a]pyrimidines from the cyclocondensation reaction of 3-amino-5-methylpyrazole with 1,1,1-trichloro-4- alkoxyalk-3-en-2-ones [CCl3C(O)CH=C(R1)OR where R1 = H, Me, Et, Pr, Bu, t-Bu e R = Me, Et] in good yields (69-98%) is reported. Also, was performed the synthesis of 2- methyl-7-arylpyrazolo[
Publicado em: 2006
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6. Rutheniumporphyrins: synthesis and application as catalysis in oxidation reactions of ciclohexane, adamantane and Z-ciclooctane. / Rutenioporfirinas: síntese e aplicação como catalisadores de reações de oxidação de ciclo-hexano, adamantano e Z-cicloocteno.
The porphyrin ligands, mesotetraphenyl-21H, 23Hporphyrin, meso-tetrakis(2-bromophenyl)-21H, 23H-porphyrin, meso-tetrakis(4- bromophenyl)-21H, 23H-porphyrin, meso-tetrakis(2-chlorophenyl)-21H, 23Hporphyrin, meso-tetrakis(4-chlorophenyl)-21H, 23H-porphyrin and meso-tetrakis(2,6- dichlorophenyl)-21H, 23H- porphyrins, were synthesized by the condensation reactio
Publicado em: 2006
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7. SÃntese e avaliaÃÃo do potencial biolÃgico de novos derivados N-fenacilados do aza-biciclo pirrolidino [3,2-d] isoxazolina
Recently, our group of research had been gotten N-(benzoyl)-pyrrolidine[3,2-d]-2- isoxazolines derivatives 40, by 1,3-dipolar cycloaddition of five membered endociclic enecarbamates and enamides, with excellent biological activities. Due to this fact, we intended the obtention of the derivatives N-(fenacyl)-pyrrolidine[3,2-d]-2-isoxazolines 41, using the aza
Publicado em: 2005
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8. Effects of centrally acting antihypertensive drugs on the microcirculation of spontaneously hypertensive rats
We investigated the acute effects of centrally acting antihypertensive drugs on the microcirculation of pentobarbital-anesthetized spontaneously hypertensive rats (SHR). The effects of the sympatho-inhibitory agents clonidine and rilmenidine, known to activate both alpha2-adrenoceptors and nonadrenergic I1-imidazoline binding sites (I1BS) in the central nerv
Brazilian Journal of Medical and Biological Research. Publicado em: 2004-10
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9. Preparação e caracterização de nanocompositos organo-inorganicos envolvendo fosfatos de metais tetravalentes e polimeros condutores
Acid cerium (IV) phosphates (CeP) were prepared and the influence of synthetical conditions, such as reagents PO4/Ce molar ratios, temperature and reaction time, on the structural and morphological properties were studied. Several techniques like X-ray diffraction, infrared, Raman and P nuclear magnetic resonance spectroscopies were used to follow the struct
Publicado em: 1999
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10. Quimicas de bacterias : biossintese e atividade biologica de metabolitos da Chromabacterium violaceum brasiliensis
The bacterium Chromobacterium vilaceum which yields 3-[1,2-dihydro-5-(5-hydroxy-1H-indol-3-yl)-2-oxo-3-ylidene]-1,3- dihydro-2H-indol-2-one (compound 1) was studied. A study of the biosynthetic capacity in the production of components with biological interest between native strain (BB -78), uncoloured strain and apparently mutant. strain obtained by irradiat
Publicado em: 1990
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11. Detection and identification of mutagens and carcinogens as their adducts with guanosine derivatives.
For use in screening for environmental mutagens and carcinogens, a highly fluorescent derivative of guanosine, 2'-deoxy-2'-(2",3"-dihydro-2",4"-diphenyl-2"-hydroxy-3"-oxo-1"-pyrrol yl) guanosine (FG), was synthesized. When incubated with FG in aqueous solution, mutagens form adducts that can be analyzed with an HPLC-fluorescence detector-system. By this meth
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12. Activity of E-3846, a new fluoroquinolone, in vitro and in experimental cystitis and pyelonephritis in rats.
The in vitro antibacterial activity of E-3846, a new fluoroquinolone carboxylic acid derivative with a pyrrol ring substituent at position 7, was evaluated in comparison with norfloxacin and ciprofloxacin. E-3846 was more active than the reference quinolones against Staphylococcus species, including methicillin-resistant strains. E-3846 was similar to ciprof