Amides
Mostrando 13-24 de 178 artigos, teses e dissertações.
-
13. Appel Reaction of Carboxylic Acids with Tribromoisocyanuric Acid/Triphenylphosphine: a Mild and Acid-Free Preparation of Esters and Amides
A facile and efficient method for esterification and amidation of carboxylic acids under neutral conditions has been developed. Esters and amides can be prepared by reacting a carboxylic acid (1 mmol) with tribromoisocyanuric acid (0.37 mmol) and triphenylphosphine (1 mmol) in dichloromethane at room temperature, followed by addition of an alcohol or an amin
J. Braz. Chem. Soc.. Publicado em: 2016-06
-
14. The novel mesoporous silica aerogel modified with protic ionic liquid for lipase immobilization
Mesoporous silica supports (aerogels) were used to immobilize Burkholderia cepacia lipase (BC) by encapsulation (EN or ENIL), physical adsorption (ADS or ADSIL) and covalent binding (CB or CBIL) into or onto the aerogel modified with protic ionic liquid (PIL). Yield immobilization (Ya) and operational stability were determined by the hydrolytic reaction of o
Quím. Nova. Publicado em: 2016-05
-
15. FTIR Spectroscopy Revealing the Effects of Laser and Ionizing Radiation on Biological Hard Tissues
This work evaluated the influence of ionizing and non-ionizing irradiations on the chemical structure of hard tissues using the mid-infrared spectroscopy. Enamel, dentin and bone slabs were submitted to gamma irradiation, as well as to Nd:YAG (λ = 1064 nm) and Er,Cr:YSGG (λ = 2078 nm) laser irradiations. The composition of slabs were evaluated by the Fouri
J. Braz. Chem. Soc.. Publicado em: 2015-12
-
16. Piperamides from Piper ottonoides by NMR and GC-MS Based Mixture Analysis
The species Piper ottonoides Yuncker (Piperaceae), known as “joão-brandim”, is a shrub that occurs in the Brazilian Amazon rainforest. Its roots and leaves are used in traditional medicine as local anesthetic to treat toothache and sore throat. In this study, the structural characterization in mixture of isobutyl amides present in semi-purified fraction
J. Braz. Chem. Soc.. Publicado em: 2015-11
-
17. Efficient Synthesis of Rhodanine-Based Amides via Passerini Reaction using Tetramethylguanidine-Functionalized Silica Nanoparticles as Reusable Catalyst
Novel rhodanine-based amide derivatives were prepared in good yields via Passerini reaction of rhodanine-
N -acetic acid with aromatic aldehydes andtert -butyl isocyanide in the presence of tetramethylguanidine immobilized on silica nanoparticles (TMG-SiO2 NPs) as a heterogeneous base catalyst. The synthesized coJ. Braz. Chem. Soc.. Publicado em: 2015-07
-
18. FT-Raman spectroscopic study of skin wound healing in diabetic rats treated with Cenostigma macrophyllum Tul
INTRODUCTION: Patients with diabetes mellitus exhibit a delay in the lesion repair process. The active components of Cenostigma macrophyllum may represent a viable alternative to facilitate the recovery of these lesions. The aim of this study was to evaluate the effects of emulsion oil-water Cenostigma macrophyllum in the repair process of lesions in rats wi
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-03
-
19. Green and selective synthesis of N-substituted amides using water soluble porphyrazinato copper(II) catalyst
N,N',N'',N'''-Tetrametil tetra(2,3-piridil)porfirazinato metil sulfato de cobre(II) ([Cu(2,3-tmtppa)](MeSO4)4) catalisou com sucesso a conversão direta de nitrilas a amidas N-substituídas. A síntese seletiva do tipo one pot de amidas N-substituídas a partir de nitrilas e aminas primárias foi realizada em refluxo de água. O catalisador foi recuperado e
J. Braz. Chem. Soc.. Publicado em: 2013-06
-
20. Antileishmanial activity of amides from Piper amalago and synthetic analogs
Two natural amides isolated from the chloroform extract of Piper amalago L., Piperaceae, leaves, a hydrogenated derivative and seven synthetic analogs were tested against the promastigote and intracellular amastigote forms of Leishmania amazonensis. The antileishmanial activity was evaluated in terms of growth inhibitory concentration for 50% of protozoa (IC
Rev. bras. farmacogn.. Publicado em: 05/03/2013
-
21. Constituintes químicos de Solanum buddleifolium Sendtn
The chemical investigation of the stem EtOH extract of S. buddleifolium resulted in the isolation of terpenoids, amides, lignans and a steroidal alkaloid. Based on HRMS, IR and ¹H and 13C NMR data analysis, the structures of the isolated compounds were identified as: 13-hydroxysolavetivone, betulinic acid, N-trans-caffeoyltyramine, N-trans-feruloyldopamine,
Quím. Nova. Publicado em: 2013
-
22. ReaÃÃes biocatalÃticas usando cÃlulas Ãntegras de Lens culinaris (Lentilha). / REACTIONS USING WHOLE CELL BIOCATALYTIC LENS CULINARIS (LENTIL)
This paper describes the use of seeds of lentil (Lens culinaris) as intact plant system in biocatalytic reactions of reduction and hydrolysis. Initially, some plant sources were evaluated for their action in the biocatalytic reduction of aromatic ketone acetophenone. The plants that showed positive results in the reduction reaction underwent determination of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/10/2012
-
23. Estudo fitoquímico das raízes de Piper mollicomum Kunth
O gênero Piper considerado o maior da família Piperaceae, com pelo menos 1000 espécies encontradas especialmente na Ásia e no Novo Mundo. Suas espécies tem boa representatividade comercial e diversas aplicações medicinais, sendo objeto de vários estudos relacionados à descoberta de novas fontes de substâncias naturais ativas. Com base nos dados apr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/02/2012
-
24. Evaluation of larvicidal activity of the methanolic extracts of Piper alatabaccum branches and P. tuberculatum leaves and compounds isolated against Anopheles darlingi
Piper is a notable genus among Piperaceae due to their secondary metabolites such as lignans, amides, esters and long chain fatty acids used as anti-herbivore defenses with comparable effects of pyrethroids, that holds a promise in insect control, including malaria vectors such as Anopheles darlingi, the main vector in the North of Brazil. Methanolic extract
Rev. bras. farmacogn.. Publicado em: 03/04/2012