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Dive into the research topics where Juliano C. R. Freitas is active.

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Featured researches published by Juliano C. R. Freitas.


Molecules | 2012

Allylation of Functionalized Aldehydes by Potassium Allyltrifluoroborate Catalyzed by 18-Crown-6 in Aqueous Media

Fernanda C. G. Barbosa; Juliano C. R. Freitas; Caio F. Melo; Paulo H. Menezes; Roberta A. Oliveira

An efficient method for the allylation of aldehydes containing a broad range of functional groups using potassium allyltrifluoroborate is described. The reaction utilizes a catalytic amount of 18-C-6 in biphasic media under open atmosphere and room temperature to provide the corresponding homoallylic alcohols in high yields and without the necessity of any subsequent purification.


Ultrasonics Sonochemistry | 2014

Metal free synthesis of homoallylic alcohols promoted by ultrasound

Jucleiton José Rufino de Freitas; Túlio R. Couto; Italo H. Cavalcanti; Juliano C. R. Freitas; Roberta A. Oliveira; Paulo H. Menezes

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 catalyst or promoter. The products were obtained in high yields, short reaction times, at room temperature and without the need of further purification.


Journal of The Chilean Chemical Society | 2014

A CONVENIENT SYNTHESIS AND CYTOTOXIC ACTIVITY OF 3-ARYL-5-PENTYL-1,2,4-OXADIAZOLES FROM CARBOXYLIC ACID ESTERS AND ARYLAMIDOXIMES UNDER SOLVENT-FREE CONDITIONS

Carlos Jonnatan Pimentel Barros; Zilyane Cardoso De Souza; Jucleiton José R. de Freitas; Paulo B.N. da Silva; Gardenia C.G. Militão; Teresinha Gonçalves da Silva; Juliano C. R. Freitas; João Rufino de Freitas Filho

The synthesis of 3-aryl-5-pentyl-1,2,4-oxadiazoles from carboxylic acid esters and arylamidoximes in the presence of potassium carbonate is described. The reaction was carried out in a microwave oven without any solvent in much shorter time and in good yields. The structures of the synthesized compounds were elucidated using IR, 1H and 13C NMR spectroscopy and elemental analysis and their antiproliferative activities was evaluated against three different human cell lines.


Revista Virtual de Química | 2018

D‐Glucose, a Fascinating Biomolecule: History, Properties, Production and Application

Rayane O. Silva; João R. de Freitas Filho; Juliano C. R. Freitas

Os carboidratos sao as biomoleculas mais abundantes na Terra e anualmente sao produzidos aproximadamente 200 bilhoes de toneladas desses compostos pelas plantas superiores e algas.Dentre os inumeros compostos classificados como carboidratos, a D-glicose e de longe o monossacarideo mais abundante. AD-glicose e um dos poucos carboidratos de baixa massa molecular, economicamente atrativo, produzido em larga escala e propenso a modificacoes estruturais para a producao de novos compostos.A D-glicose e utilizada nos mais variados setores industriais, tais como: no alimenticio, farmaceutico, cosmetico, quimico dentre outros. Diante disto, e justificavel o aumento anual da demanda de D-glicose, na qual ela pode ser obtida por distintos processos industriais, como a hidrolise acida e a hidrolise enzimatica.Em funcao da relevância da D-glicose, este artigo apresenta uma revisao sobre a historia, as propriedades, a producao e biossintese deste composto.


Revista Virtual de Química | 2018

Recent Advances in C-Glycoside Chemistry: Application, Synthesis and Reactions

Josefa Aqueline da Cunha Lima; Mauricélia M. S. Mata; Renê G. da Silva; Wagner E. da Silva; Juliano C. R. Freitas; João R. de Freitas Filho

A sintese de C-glicosideos, analogos de acucar em que o oxigenio glicosidico e substituido por um atomo de carbono e de particular interesse devido a sua utilidade como intermediarios chave para a montagem de moleculas e produtos naturais biologicamente ativos. Apesar da sua quimica desafiadora, devido a sua versatilidade, os C-glicosideos desempenham um papel fundamental no desenvolvimento da quimica de novos materiais e moleculas bioativas. Nesta revisao, apresentamos varias metodologias sinteticas, proposta mecanicista e aplicacao de C-glicosideos 2,3-insaturados nos ultimos vinte ano


Journal of the Brazilian Chemical Society | 2018

An Efficient Method for the Hydrolysis of Potassium Organotrifluoroborates Promoted by Montmorillonite K10

Renato L. Silva; Cosme S. Santos; Jonh Anderson M. Santos; Roberta A. Oliveira; Paulo H. Menezes; Juliano C. R. Freitas

An efficient and non-expensive method for conversion of diverse potassium organotrifluoroborates to their corresponding boronic acids promoted by montmorillonite K10 using water as the reaction solvent is described. Further interconversion of potassium organotrifluoroborates to their corresponding boronic esters, via boronic acid intermediates was also successfully accomplished. The products were obtained in good yields, being the rate of hydrolysis influenced by the type of substituent present in the boronic acid.


Revista Brasileira de Ensino de Ciência e Tecnologia | 2011

Separação de Mistura Sólido–Sólido : Novo Enfoque Experimental

João Rufino de Freitas Filho; Afonso Feitosa Reis Filho; Maria do Socorro Lopes Pina; Juliano C. R. Freitas; Jucleiton José R. de Freitas

Neste artigo, um novo metodo experimental e apresentado na separacao de mistura solido-solido, usando materiais baratos e simples. As atividades propostas foram divididas em dois momentos distintos: a) construcao de equipamentos; b) realizacao de experimentos para gerar resultados a serem interpretados. Estas atividades possibilitam a construcao de conceitos, por exemplos, solubilidade, substâncias, misturas, dissolucao, combustao e inflamavel.


Synthesis | 2014

Propargylation of Aldehydes Using Potassium Allenyltrifluoroborate

Túlio R. Couto; Jucleiton José Rufino de Freitas; Juliano C. R. Freitas; Italo H. Cavalcanti; Paulo H. Menezes; Roberta A. Oliveira


Synthesis | 2014

Electrochemical Synthesis of Potassium Aryltrifluoroborates

Wilson S. Nascimento; Jadson L. Oliveira; Juliano C. R. Freitas; Marcelo Navarro; Paulo H. Menezes


European Journal of Medicinal Chemistry | 2017

Structure-based design, synthesis and antitumoral evaluation of enulosides

Jonh Anderson Macêdo Santos; Cosme Silva Santos; Claudia Lais Araujo Almeida; Thiago D. S. Silva; João Rufino de Freitas Filho; Gardenia C.G. Militão; Teresinha Gonçalves da Silva; Carlos H.B. da Cruz; Juliano C. R. Freitas; Paulo H. Menezes

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João Rufino de Freitas Filho

Universidade Federal Rural de Pernambuco

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Paulo H. Menezes

Federal University of Pernambuco

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Jucleiton José R. de Freitas

Universidade Federal Rural de Pernambuco

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João R. de Freitas Filho

Federal University of Pernambuco

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Roberta A. Oliveira

Federal University of Pernambuco

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Cosme Silva Santos

Federal University of Pernambuco

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Túlio R. Couto

Federal University of Pernambuco

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