- A new approach for the synthesis of biologically active chromene compounds using a photo catalyst TiO2-Ag
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A green and efficient method for the synthesis of chromene derivatives using TiO2 doped Ag as a photocatalyst under visible light irradiation at room temperature is reported. The advantages of our method are clean reaction condition, easy workup procedure, use of eco-friendly solvent, and recyclable catalyst and most importantly higher yield of the product. The photocatalyst was found to be highly efficient for the synthesis of chromene derivatives within a short reaction time. The photocatalyst was prepared and characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), and powder XRD technique and thermogravimetric analysis (TGA). In addition, the in-vitro study of helminths against S. obvelata were investigated and it was found that chromene derivatives were active against S. obvelata and showed no sign of acute toxicity in mice.
- Chhetri, Bhusan,Kharmawlong, George Kupar,Kumar, John Elisa,Nongkhlaw, Rishanlang,Nongrum, Ridaphun,Yadav, Arun Kumar
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- Pseudo Multicomponent Reaction: Synthesis of Fused Pyrano Biscoumarin Analogs from 1,2-diols
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A simple and efficient method has been developed for the synthesis of fused pyrano biscoumarins using lead tetraacetate as an oxidizing agent by the condensation of one equivalent of 1,2-diols and four equivalent of 4-hydroxy coumarin in acetonitrile as solvent at 80°C with good to excellent yields.
- Jagadishbabu, Narasashetty,Shivashankar, Kalegowda
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p. 1543 - 1549
(2017/03/27)
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- Reaction of dimethyl sulfoxide-acetic anhydride with 4-hydroxy-coumarin, its derivatives under microwave conditions
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4-Hydroxycoumarin and various biscoumarins synthesized under microwave conditions were treated with the DMSO-Ac2O reagent under the same conditions to yield different products. A comparative account of the reactions with conventional procedure, as reporte
- Qadir, Saima,Khan, Khaliquz Zaman,Jan, Arif
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p. 3019 - 3022
(2013/05/21)
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- Synthesis, structure, antimicrobial and antioxidant investigations of dicoumarol and related compounds
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Different substituted 3,3′-arylidenebis-4-hydroxycoumarins (1-7) and tetrakis-4-hydroxycoumarin derivative 8 are the final products when 4-hydroxycoumarin and aromatic aldehydes containing different groups in ortho, meta or para positions condense in boil
- Hamdi, Naceur,Puerta, M. Carmen,Valerga, Pedro
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p. 2541 - 2548
(2008/12/23)
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