Zobrazeno 1 - 10 of 15 pro vyhledávání: '"Jucleiton J. R. Freitas"'
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Akademický článek
Efficient method for propargylation of aldehydes promoted by allenylboron compounds under microwave irradiation
Autor: Jucleiton J. R. Freitas, Queila P. S. B. Freitas, Silvia R. C. P. Andrade, Juliano C. R. Freitas, Roberta A. Oliveira, Paulo H. Menezes
Publikováno v: Beilstein Journal of Organic Chemistry, Vol 16, Iss 1, Pp 168-174 (2020)
The propargylation of aldehydes promoted by microwave irradiation using allenylboron compounds in a chemo- and regioselective way is described. The corresponding products were obtained in short reaction time, high yield and purity without the need of
Externí odkaz: https://doaj.org/article/db2528c5739b4c8fabea6aaba2e30880
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2
Synthesis, antineoplastic activity and in silico studies of (S)-N-(1-hydroxy-3-methylbutan-2-yl)-3-(p-tolyl)-1,2,4-oxadiazole-5-carboxamide
Autor: Jonh Anderson Macêdo Santos, Silvia Maria Souza, Juliano C. R. Freitas, Rodrigo Ribeiro Alves Caiana, Cláudia Laís Araújo Almeida Santos, Gardênia Carmem Gadelha Militão, Jucleiton J. R. Freitas
Publikováno v: Research Journal of Chemistry and Environment. 25:167-176
The development of chemotherapy agents without side effects is a major challenge, since traditional medicines usually have undesirable properties such as high toxicity, resistance and low bioavailability. In this sense, computational methods play a c
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e41cb9fa0757bf659b74069ff2027cff
https://doi.org/10.25303/257rjce16721
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3
SYNTHESIS, CHARACTERIZATION, AND EVALUATION OF TOXICITY AGAINST SALINE ARTEMIA OF 2,3-UNSATURATED GLYCOSIDES
Autor: Edilma Elayne da Silva, Maria Verônica de Sales Barbosa, João R. de Freitas Filho, Jucleiton J. R. Freitas, Jucarlos Rufino de Freitas
Publikováno v: Periódico Tchê Química. 17:251-262
In the chemistry of carbohydrates, the 2,3-unsaturated O-glycoside is an organic molecule in which the saccharide unit is linked to another functional group through a glycosidic bond. Unsaturated carbohydrate derivatives are useful intermediates in s
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::76aa722a4f54667f7f5905263b13390a
https://doi.org/10.52571/ptq.v17.n36.2020.266_periodico36_pgs_251_262.pdf
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4
Efficient method for propargylation of aldehydes promoted by allenylboron compounds under microwave irradiation
Autor: Queila P. S. B. Freitas, Paulo H. Menezes, Juliano Carlo Rufino Freitas, Silvia R. C. P. Andrade, Jucleiton J R Freitas, Roberta A. Oliveira
Publikováno v: Beilstein Journal of Organic Chemistry, Vol 16, Iss 1, Pp 168-174 (2020)
Beilstein Journal of Organic Chemistry
The propargylation of aldehydes promoted by microwave irradiation using allenylboron compounds in a chemo- and regioselective way is described. The corresponding products were obtained in short reaction time, high yield and purity without the need of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab9bf6896be948268b3468c07b174f8d
https://doaj.org/article/db2528c5739b4c8fabea6aaba2e30880
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5
Efficient Method for Propargylation of Aldehydes Promoted by Allenyl Boron Compounds under Microwave Irradiation
Autor: Jucleiton J R Freitas, Queila P S B Freitas, Silvia R C P Andrade, Juliano C R Freitas, Roberta A Oliveira, Paulo H Menezes
The propargylation of aldehydes promoted by microwave irradiation using allenyl boron compounds in a chemo- and regioselective way is described. The corresponding products were obtained in short reaction time, high yield and purity without the need o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::618bb01f9fcf58c98b17fcee8af8a50c
https://doi.org/10.3762/bxiv.2019.138.v1
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6
Regioselective propargylation of aldehydes using potassium allenyltrifluoroborate promoted by tonsil
Autor: Italo H. Cavalcanti, Queila P. S. Barbosa, Jucleiton J. R. Freitas, Juliano C. R. Freitas, Roberta A. Oliveira, Túlio R. Couto
Publikováno v: Tetrahedron Letters. 57:760-765
The propargylation of aldehydes using potassium allenyltrifluoroborate promoted by tonsil, an inexpensive and readily available clay, in a chemo- and regioselective way is described. The method is simple and avoids the use of air and moisture sensiti
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9497f426d10e45a3b691dda7087f3925
https://doi.org/10.1016/j.tetlet.2016.01.017
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7
Ultrasound-Promoted Chemoselective Oxysulfonylation of Alkenes
Autor: Gilson Zeni, Jucleiton J. R. Freitas, Paulo H. Menezes, Queila P. S. B. Freitas, Raffael A. G. Lira
Publikováno v: Journal of the Brazilian Chemical Society, Volume: 29, Issue: 6, Pages: 1167-1174, Published: JUN 2018
Journal of the Brazilian Chemical Society v.29 n.6 2018
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
The ultrasound-assisted oxysulfonylation of different alkenes using sodium salts of organosulfinic acids under air atmosphere is described. The reaction is chemo- and regioselective and the corresponding β-keto-sulfones were obtained in good yields
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41c179bc74acffc62a893314285e14b4
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532018000601167&lng=en&tlng=en
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9
Propargylation of Aldehydes Using Potassium Allenyltrifluoroborate
Autor: Italo H. Cavalcanti, Paulo H. Menezes, Juliano C. R. Freitas, Jucleiton J. R. Freitas, Túlio R. Couto, Roberta A. Oliveira
Publikováno v: Synthesis. 47:71-78
The commercially available resin Amberlyst A-31 was efficiently used to promote the propargylation of aldehydes using potassium allenyltrifluoroborate. The method is simple and fast, and the products were obtained in short reaction times in high yiel
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b7c618870ee16f45e0345cfe5e0c8454
https://doi.org/10.1055/s-0034-1379163
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10
Metal free synthesis of homoallylic alcohols promoted by ultrasound
Autor: Paulo H. Menezes, Túlio R. Couto, Italo H. Cavalcanti, Juliano Carlo Rufino Freitas, Roberta A. Oliveira, Jucleiton J. R. Freitas
Publikováno v: Ultrasonics Sonochemistry. 21:1609-1614
The use of ultrasound irradiation to promote the allylation of aldehydes containing different functionalities with potassium allyltrifluoroborates is described. The method features the use of a minimum amount of acetone as solvent, without any other
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e2724067022350eb7a11b4acc36ecd18
https://doi.org/10.1016/j.ultsonch.2014.04.001
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