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4 Hydroxycoumarin

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Ilia Manolov – One of the best experts on this subject based on the ideXlab platform.

  • Investigation of the antioxidant properties of some new 4Hydroxycoumarin derivatives
    European Journal of Medicinal Chemistry, 2008
    Co-Authors: Stancho Stanchev, Vera Hadjimitova, T. Traykov, T. Boyanov, Ilia Manolov

    Abstract:

    Abstract The aim of this investigation was to measure the activity of four 4Hydroxycoumarin derivatives – three of them were described before and one was newly synthesized. The substances were ethyl 2-[(4-hydroxy-2-oxo-2 H -chromen-3-yl)(4-hydroxyphenyl)methyl]-3-oxobutanoate ( SS-14 ), 4-[1-(4-hydroxy-2-oxo-2 H -chromen-3-yl)-2-(ethoxycarbonyl)-3-oxobutyl]benzoic acid ( SS-17 ), ethyl 2-[(4-hydroxy-2-oxo-2 H -chromen-3-yl)(3-nitrophenyl)methyl]-3-oxobutanoate ( SS-21 ) and ethyl 2-[(3,4,5-trimethoxyphenyl)(4-hydroxy-2-oxo-2 H -chromen-3-yl)methyl]-3-oxobutanoate ( T-2 ). The synthesis of T-2 consists of two steps. First step was Knoevenagel reaction between 3,4,5-trimethoxybenzaldehyde and ethylacetoacetate. Ethyl 2-(3,4,5-trimethoxy)-phenylmethyleneacetoacetate was the product. Second step was Michael addition reaction between the latter product and 4Hydroxycoumarin. All the compounds were tested in vitro for antioxidant activity in hypochlorous system. The assay was based on the luminol-dependent chemiluminescence of free radicals, which decreased in the presence of 4Hydroxycoumarin derivative. Compound SS-14 (ethyl 2-[(4-hydroxy-2-oxo-2 H -chromen-3-yl)(4-hydroxyphenyl)methyl]-3-oxobutanoate) expresses the best scavenger activity at the highest concentration (10 −4  mol/L).

  • synthesis computational study and cytotoxic activity of new 4 Hydroxycoumarin derivatives
    European Journal of Medicinal Chemistry, 2008
    Co-Authors: Stancho Stanchev, Georgi Momekov, Frank Jensen, Ilia Manolov

    Abstract:

    Abstract Six new 4Hydroxycoumarin derivatives have been synthesized. They were characterized by UV–vis, IR, 1 H NMR, 13 C NMR, mass spectral data, elemental analysis, TLC and melting point determination. The new 4Hydroxycoumarin derivatives are studied by computational methods – DFT (B3LYP) and force field methods (MM2 and OPLS), in order to optimize their geometry and calculate quantum-chemical properties and conformational analysis. Five new 4Hydroxycoumarin derivatives were tested for cytotoxic activity in two tumor cell lines – HL-60 and EJ. The obtained results are compared with the utilized anticancer drug melphalan. Two of these compounds – ethyl 2-[(3,4-dihydroxyphenyl)(4-hydroxy-2-oxo-2 H -chromen-3-yl)methyl]-3-oxobutanoate ( SS – 16 ) and ethyl 2-[(4-hydroxy-2-oxo-2 H -chromen-3-yl)(3-nitrophenyl)methyl]-3-oxobutanoate ( SS – 21 ) show comparatively good cytotoxic properties. Their activity is weaker than melphalan. SS – 16 seems to be more active than SS – 21 .

  • Synthesis, Structure and Acid-Base Behaviour of Some 4Hydroxycoumarin Derivatives
    Zeitschrift für Naturforschung B, 2007
    Co-Authors: Stancho Stanchev, Cäcilia Maichle-mössmer, Ilia Manolov

    Abstract:

    The compound 3,3′-[(4-hydroxy-3-methoxy-5-nitrophenyl)methylene]-bis(4-hydroxy-2H-1benzopyran-2-one) (1) crystallizes in the monoclinic system, space group P21/n, with cell constants a = 16.859(4), b = 6.1624(15), c = 25.164(4) A, β = 98.019(19)◦ . The two 4Hydroxycoumarin fragments are intramolecularly hydrogen-bonded between hydroxyl and carbonyl groups. The pHdependent color changes of 4Hydroxycoumarin derivatives were studied by means of potentiometric and spectrophotometric titration. On the basis of the results obtained, the use of 3,3′-[(4-hydroxy-3methoxy-5-nitrophenyl)methylene]-bis(4-hydroxy-2H-1-benzopyran-2-one) as an indicator in alkalimetry and acidimetry is proposed.

Marc Lemaire – One of the best experts on this subject based on the ideXlab platform.

  • field assessment of 4 Hydroxycoumarin as an attractant for anthropophilic anopheles spp vectors of malaria in madagascar
    Scientific Reports, 2020
    Co-Authors: Tovo Mbolatiana Andrianjafy, Marc Lemaire, Voahangy Vestalys Ramanandraibe, Elodie Toavina Andrianarijaona, Niry Hasinandrianina Ramarosandratana, Lala Harivelo Ravaomanarivo, Patrick Mavingui

    Abstract:

    Mosquito-borne diseases like malaria are a major public health problem in tropical countries, such as Madagascar. Female Anopheles mosquito vectors the human malaria parasites (Plasmodium spp.) and is important indicator in malaria surveillance activities. Among the various means of vector control in Madagascar, the use of attractants for mass trapping of target species could be an alternative to insecticides. The aim of this study is to evaluate whether 4Hydroxycoumarin can be used as an attractant for anthropophilic Anopheles spp. vectors of malaria. For this, a field study was conducted using CDC light traps in the village of Ambohidray, Madagascar. 16 days of trapping was conducted and four replicates nights were performed for each product tested. 4Hydroxycoumarin, octenol and two types of blend of these products were tested. The results showed that 4Hydroxycoumarin (2 mg) have a significant attractive effect on Anopheles spp. and significant selectivity towards Anopheles gambiae s.l, and Anopheles mascarensis which are both significant malaria vectors in Madagascar. A synergy of 4Hydroxycoumarin with octenol was found to attract these mosquito vectors. A significant decrease in vector populations was observed during this experiment. These results suggest that 4Hydroxycoumarin could be useful for malaria surveillance and the control of vector populations.

  • 3 methylene 2 4 chromandione in situ trapping introducing molecular diversity on 4 Hydroxycoumarin
    RSC Advances, 2016
    Co-Authors: Adrien Montagutromans, Marc Lemaire, Manon Boulven, Florence Popowycz

    Abstract:

    3-Methylene-2,4-chromandione trapped in a solid-state stable Mannich adduct, is released in solution. In the presence of different nucleophiles, this highly reactive intermediate allows the introduction of molecular diversity on C-3 position of 4Hydroxycoumarin.

  • efficient c 3 reductive alkylation of 4 Hydroxycoumarin by dehydrogenative oxidation of benzylic alcohols through ruthenium catalysis
    ChemInform, 2014
    Co-Authors: Marc Lemaire, Adrien Montagutromans, F Popowycz, Manon Boulven

    Abstract:

    Only benzylic alcohols react with 4Hydroxycoumarin in the presence of Wilkinson′s catalyst.

Allan E Rettie – One of the best experts on this subject based on the ideXlab platform.

  • pharmacogenomics of 4 Hydroxycoumarin anticoagulants
    Drug Metabolism Reviews, 2008
    Co-Authors: Nicholas T Au, Allan E Rettie

    Abstract:

    Oral anticoagulants of the 4Hydroxycoumarin class, typified by warfarin, are used worldwide to treat thromboembolic disease. These drugs show the beneficial attributes of high efficacy and low cost, but patient management can be complicated by their narrow therapeutic index and wide inter-individual variability in dosing. Our understanding of the latter complication has improved significantly in recent years due to intense investigation of genetic factors influencing drug pharmacokinetics (CYP2C9) and pharmacodynamic response (VKORC1). In particular, the discovery of polymorphisms in the VKORC1 gene that strongly impact oral anticoagulant dose has heightened expectations that genetic testing for a relatively small cadre of warfarin-response genes might substantially enhance patient care in this area, especially during the initiation phase of therapy. However, enthusiasm for genotype-based dosing of oral anticoagulants must be balanced against the ready availability of both a simple phenotypic test (proth…