Výsledky vyhledávání - "Ulisses Z. Melo"

Strong hyperconjugative interactions limit solvent and substituent influence on conformational equilibrium: the case of cis-2-halocyclohexylamines

Autor: Ernani A. Basso, Gisele F. Gauze, Camila Botin Francisco, Ulisses Z. Melo, Cleverton S. Fernandes, Roberto Rittner

Publikováno v: Beilstein Journal of Organic Chemistry, Vol 15, Iss 1, Pp 818-829 (2019)
Beilstein Journal of Organic Chemistry

The presence of strong stereoelectronic interactions involving the substituents in cis-2-substituted cyclohexanes may lead to results different from those expected. In this work, we studied the conformational behavior of cis-2-fluoro- (F), cis-2-chlo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8eb7f892dc611ba99e2de6d96a4ab941
https://doaj.org/article/685b4b87932d49fdaee0a39ecd7bfca6

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DFT calculations and NMR measurements applied to the conformational analysis of cis and trans -3-phenylaminocyclohexyl N,N -dimethylcarbamates

Autor: Augusto A. Cândido, Gisele F. Gauze, Diego A. S. Yamazaki, Ulisses Z. Melo, Ernani A. Basso

Publikováno v: Journal of Molecular Structure. 1163:227-235

The three-dimensional structure of a potential drug molecule is of critical importance. Factors that determine its conformational stability and, consequently, corresponding biological/physicochemical properties of interest must therefore be carefully

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::774147e8c33ddc5c80803332f56ed3ee
https://doi.org/10.1016/j.molstruc.2018.01.096

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Conformational equilibrium of phenylacetic acid and its halogenated analogues through theoretical studies, NMR and IR spectroscopy

Autor: Barbara C. Fiorin, Ulisses Z. Melo, Thiago C. Rozada, Ernani A. Basso, Mariana N. Levandowski

Publikováno v: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 174:138-146

This paper presents a study on the conformational preferences of phenylacetic acid (PA) and its halogenated analogues (FPA, CPA, BPA). To clarify the effects that rule these molecules' behaviour, theoretical calculations were used, for both the isola

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::965f710c5a3206448e493c0dcfc3c7a5
https://doi.org/10.1016/j.saa.2016.10.050

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Structural characterization of dimeric indole alkaloids from Psychotria brachybotrya by NMR spectroscopy and theoretical calculations

Autor: Marcos A. Ribeiro, Debora Cristina Baldoqui, Ulisses Z. Melo, Willian Ferreira da Costa, Carla M. B. Gomes, Maria Helena Sarragiotto, Ernani A. Basso, Zefa Valdivina Pereira, Anelise Samara Nazari Formagio

Publikováno v: Tetrahedron Letters. 57:1331-1334

Chemical study of Psychotria brachybotrya led to the isolation of a new dimeric tryptamine-related alkaloid, named brachybotryne ( 1 ), and its N -oxide derivative 2 , together with a known compound identified as bufotenine ( 3 ). In order to corrobo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::be3ef7a65f055bae2093b334f278d79d
https://doi.org/10.1016/j.tetlet.2016.02.040

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Theoretical and experimental investigation of the polyeletrophilic β-enamino diketone: straightforward and highly regioselective synthesis of 1,4,5-trisubstituted pyrazoles and pyrazolo[3,4-d]pyridazinones

Autor: Ulisses Z. Melo, Rodrigo M. Pontes, Michael J. V. da Silva, Raí G. M. Silva, Fernanda A. Rosa, Davana S. Gonçalves, Ernani A. Basso, Sidnei Moura, Davi F. Back, Gisele F. Gauze

Publikováno v: RSC Advances. 6:290-302

Obtaining a new precursor enamino diketone with five electrophilic centers is reported, along with theoretical and experimental studies of its reactivity against mono- or dinucleophiles. The Fukui function showed that the β-carbon is the most electr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e0a93c4044345d46dcb35b70cb57c529
https://doi.org/10.1039/c5ra12968k

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Structural Characterization and Biological Evaluation of 18-Nor-ent-labdane Diterpenoids from Grazielia gaudichaudeana

Publikováno v: Chemistrybiodiversity. 16(5)

The phytochemical investigation of Grazielia gaudichaudeana aerial parts yielded 15 compounds, including diterpenes, triterpenes, sterols and flavonoids. With exception to ent-kaurenoic acid diterpenes, the compounds isolated are being described for

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31c46451a42c6704f847c278bf4b5032
https://pubmed.ncbi.nlm.nih.gov/30843651

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Antioxidant activity of α and β-amyrin isolated from Myrcianthes pungens leaves

Autor: Caio Franco de Araújo Almeida Campo, Mariza Barion Romagnolo, Giani Andrea Linde, Zilda Cristiani Gazim, Antonio Laverde, Herika Line Marko de Oliveira, Ulisses Z. Melo, Bruna Karen Cardoso, Carla Maria Mariano Fernandez, José Eduardo Gonçalves

Brazil has a great variety of native plants which could be explored and among them guabiju (Myrcianthes pungens) stands out. Thus, this study consisted of isolating pentacyclic triterpenes, α and β-amyrin from guajibu leaves, and determine the anti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf139453a0186474505c98a5fbaea05c

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Facial Selectivity between Carbohydrates and Aromatic Amino Acids Explained by a Combination of NCI, NBO and EDA Techniques with NMR Spectroscopy

Autor: Rodrigo M. Pontes, Ernani A. Basso, Ulisses Z. Melo, Thiago C. Rozada, Roberto Rittner

Publikováno v: Journal of the Brazilian Chemical Society, Volume: 30, Issue: 5, Pages: 948-967, Published: 08 APR 2019
Journal of the Brazilian Chemical Society v.30 n.5 2019
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ

The influence of electrostatic and dispersion components of intermolecular interactions on the recognition of carbohydrates by aromatic protein residues is important for many biological processes. Interactions between glucose and galactose and aromat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdb46be85dcc63d8107dfb53749af19b
https://doi.org/10.21577/0103-5053.20180241

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