4 research outputs found

    Kinetic resolution of 5H-pyrrolo[1,2-a]imidazol-7-ol, 6,7-dihydro under continuous flow conditions: An intermediate for chiral ionic liquids synthesis

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    Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)In this letter we disclosed an efficient method for the kinetic resolution of an imidazole derivate both in batch and continuous flow conditions. This imidazole derivative has been described to have important applications in different fields and it was obtained, in its enantiomerically pure form, with excellent enantiomeric excess, good yields and short time using continuous flow conditions. (c) 2013 Elsevier B.V. All rights reserved.917780Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)FINEP (Agencia Financiadora de Estudos e Projetos)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

    On the mechanism of the Dakin-West reaction

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    Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)The mechanism of the Dakin-West reaction has been thoroughly investigated by monitoring the reaction using ESI-MS/MS techniques in combination with M06-2X/6-311++ G(d,p) calculations. Several of the key intermediates in the previously proposed "azlactone" mechanism have been experimentally detected and characterized. In particular, interception of the mixed anhydrides involved in the early and late stages of the mechanistic scheme, as well as of the cyclic acyl-oxazolone intermediate, supports the original pathway suggested by Dakin and West. All intermediates and transition structures involved in several competing mechanisms have been calculated. The theoretical calculations support the experimental results and corroborate the proposed "azlactone" mechanism. The pathway involving the cyclic oxazolone ("azlactone") intermediate represents an energy barrier more than 3 kcal mol(-1) lower than for the competing aldol-type mechanism, thus ruling out this alternative mechanism. The DFT calculations explain the observed ESI-MS data and assess those intermediates which the experiments cannot fully elucidate.o TEXTO COMPLETO DESTE ARTIGO, ESTARÁ DISPONÍVEL À PARTIR DE AGOSTO DE 2015.104590139020Spanish Ministerio de Ciencia e InnovacionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

    Anemia ferropriva e estado nutricional de crianças com idade de 12 a 60 meses do município de Viçosa, MG Iron deficiency anemia and nutritional status of children aged 12 to 60 months in the city of Viçosa, MG, Brazil

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    Este estudo transversal abrangeu crianças com idade de 12 a 60 meses assistidas pelo serviço público de saúde do município de Viçosa, objetivando avaliar a prevalência de anemia e anemia grave, e a relação entre o estado nutricional e a anemia ferropriva, nessas crianças. Para o diagnóstico de anemia, foi utilizado o beta-hemoglobinômetro (Hemocue), considerando o ponto de corte proposto pela Organização Mundial da Saúde de 11,0 g/dL para anemia, e para a anemia grave considerou-se 9,5g/dL. Das 171 crianças atendidas, 63,2% estavam anêmicas e 43,5% destas apresentavam anemia grave. Analisando o estado nutricional, encontrou-se uma alta porcentagem de crianças desnutridas, sendo considerados os índices de peso/idade, peso/estatura e estatura/idade (11,7%, 7,0% e 5,8%, respectivamente). Observou-se alta prevalência de anemia entre as faixas etárias mais precoces. Não foi verificada associação entre anemia e estado nutricional. Torna-se, portanto, necessário trabalhar de forma preventiva a anemia, bem como alertar os profissionais da área de saúde quanto ao diagnóstico precoce, profilaxia e tratamento.<br>This cross sectional study included children aged 12 to 60 months attended by the public health service in the city of Viçosa, state of Minas Gerais. The objective was to evaluate the prevalences of anemia and serious anemia, the hemoglobin levels and the relation between nutritional status and iron deficiency anemia in these children. For the diagnosis of anemia, (Hemocue) was used, and the cutoff point of 11.0 g/dL proposed by the World Health Organization for anemia, and was adopted serious anemia, was adopted 9,5g/dL. A total of 171 children was evaluated; 62.2% were anemic and 43.5% of these were seriously anemic. Analyzing the nutritional status, a high percentage of under nourished children was found, according to the indexes weight/age, weight/height and height/age (11.7%, 7.0% and 5.8%, respectively). A high prevalence of anemia was observed among the earlier groups. No association was verified between anemia and nutritional status. Therefore, it is necessary to work towards anemia prevention and to alert the health professionals to an early diagnosis, prophylaxis and treatment
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