22 research outputs found

    Antibacterial Properties of Ajuga chamaecistus Subsp. Scoparia and Chemical Composition of its Oils

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    In the present study, we reported the essential oils chemical composition and antibacterial activities of the aerial parts of Ajuga chamaecistus Ging. ex Benth. Subsp. Scoparia (Boiss.) Rech.f. thatwere collected duringMay 2013 and April 2014 and extracted by SDE (simultaneous distillation–extraction) and Clevenger apparatus. GC/MS analysis of the plant essential oils led to the identification of chemical composition of its oils. The main constituents of the essential oils in two SDE (simultaneous distillation–extraction) and Clevenger apparatus were β-Pinene (23.5%), α-Pinene (6.9%), Limonene (10.8%), Linalool (8.3) and Eugenol (7.7%). Essential oil was tested for their antibacterial activities using Gram-negative bacteria, Gram-positive bacteria. The plant was screened for its antibacterial activity and showed antibacterial activity against P. aeruginosa, E. coli, K. pneumoniae, P. vulgaris, S. paratyphi, B. subtilis, S. aureus, S. epidermidis and S. dysenteriae

    Nano-Co 3

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    Sonochemical synthesis of chromenes catalyzed by L-phenyl alanine-attached nano-Fe3O4@SiO2

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    An efficient multi-component synthesis of 10,10-dimethyl-7-(phenyl)-10,11-dihydrochromeno[4,3-b]chromene-6,8(7H,9H)-diones is described by a one-pot condensation reaction of aldehydes, dimedone and 4-hydroxycoumarin using L-phenyl alanine tethered to nano-Fe3O4@SiO2 under ultrasonic irradiation. The catalyst has been characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDX), thermal gravimetric analysis (TGA) and vibrating-sample magnetometer (VSM). Atom economy, wide range of products, high catalytic activity, excellent yields in short reaction times, reusability of the catalyst and low catalyst loading are some of the important features of this protocol

    A concise synthesis of furo[3,2-c]coumarins catalyzed by nanocrystalline ZnZr4(PO4)6 ceramics under microwave irradiation

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    A simple and concise method catalyzed by nanocrystalline ZnZr4(PO4)6 ceramics has been reported for the synthesis of a series of trans-2-benzoyl-3-(aryl)-2H-furo[3,2-c]chromen-4(3H)-ones using a multicomponent reaction of 2,4′-dibromoacetophenone, benzaldehydes and 4-hydroxycoumarin under microwave irradiation. This method provides several advantages including easy workup, excellent yields, short reaction times, using of microwave as clean method, recoverability of the catalyst and little catalyst loading

    Diastereoselective synthesis of trans-2,3-dihydrofuro[3,2-c]coumarins by MgO nanoparticles under ultrasonic irradiation

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    MgO nanoparticles have been used as an efficient catalyst for the diastereoselective preparation of trans-2-benzoyl-3-(aryl)-2H-furo[3,2-c]chromen-4(3H)-ones by the multi-component reaction of 2,4â²-dibromoacetophenone, pyridine, benzaldehydes and 4-hydroxycoumarin under ultrasonic irradiation. This interesting result revealed that the pyridiniumylide assisted tandem three-component coupling reaction is highly diastereoselective. Atom economy, wide range of products, high catalytic activity, excellent yields in short reaction times, diastereoselective synthesis and environmental benignity are some of the important features of this protocol. Keywords: Furo[3,2-c]coumarins, Ultrasonic irradiation, MgO nanoparticles, Diastereoselective, One-pot synthese

    CoFe 2

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    An Efficient Synthesis of Dihydropyrano[3,2-<i>c</i>]chromene and Biscoumarin Derivatives Catalyzed by Ionic Liquid Immobilized on FeNi<sub>3</sub> Nanocatalyst

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    <p>In this research, a highly efficient method is described for the synthesis of dihydropyrano[3,2-<i>c</i>]chromenes and biscoumarins using ionic liquids (ILs) supported on nano-FeNi<sub>3</sub> as catalyst. The heterogeneous catalyst was fully characterized by X-ray diffraction (XRD), SEM, FT-IR, and vibrating sample magnetometer (VSM).</p

    Sonochemical synthesis of chromenes catalyzed by <i>L</i>-phenyl alanine-attached nano-Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>

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    <p>An efficient multi-component synthesis of 10,10-dimethyl-7-(phenyl)-10,11-dihydrochromeno[4,3-<i>b</i>]chromene-6,8(7<i>H</i>,9<i>H</i>)-diones is described by a one-pot condensation reaction of aldehydes, dimedone and 4-hydroxycoumarin using <i>L</i>-phenyl alanine tethered to nano-Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> under ultrasonic irradiation. The catalyst has been characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDX), thermal gravimetric analysis (TGA) and vibrating-sample magnetometer (VSM). Atom economy, wide range of products, high catalytic activity, excellent yields in short reaction times, reusability of the catalyst and low catalyst loading are some of the important features of this protocol.</p
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