- 4'-Hydroxy-3-methoxyflavones with potent antipicornavirus activity
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4'-Hydroxy-3-methoxyflavones are natural compounds with known antiviral activities against picornaviruses such as poliomyelitis and rhinoviruses. In order to establish a structure-activity relationship a series of analogues were synthesized, and their antiviral activities and cytotoxicities were compared with those of flavones from natural origin. The 4'-hydroxyl and 3-methoxyl groups, a substitution in the 5 position and a polysubstituted A ring appeared to be essential requirements for a high activity. The most interesting compound was 4',7-dihydroxy-3-methoxy-5,6-dimethylflavone possessing in vitro TI99 values of > 1000 and > 200 against poliovirus type 1 and rhinovirus type 15, respectively. This compound was also active against other rhinovirus serotypes (2, 9, 14, 29, 39, 41, 59, 63, 70, 85, and 89) tested, having MIC50 values ranging from 0.016 to 0.5 μg/mL. Finally in contrast to quercetin it showed to be not mutagenic in concentrations up to 2.5 mg in the Ames test.
- De Meyer,Haemers,Mishra,Pandey,Pieters,Vanden Berghe,Vlietinck
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p. 736 - 746
(2007/10/02)
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- REACTION OF POTASSIUM SUPEROXIDE WITH 3-NITRO-2-PHENYL-2H-1-BENZOPYRANS AND THEIR DIHYDRO DERIVATIVES
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3-Nitro-2-phenyl-2H-1-benzopyrans on treatment with potassium superoxide in dimethyl sulphoxide are degraded mainly to the corresponding salicylic acids and benzoic acids. Formation of flavonols, as a minor product are also observed. The dihydro derivatives of 3-nitro-2-phenyl-2H-1-benzopyrans are converted to the corresponding flavonols by potassium superoxide in benzene containing 18-crown-6 ether.
- Rao, Takkellapati Sudhakar,Trivedi, Girish Kumar
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p. 2117 - 2124
(2007/10/02)
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- A NOVEL PHOTOCHEMICAL METHOD FOR THE SYNTHESIS OF FLAVONOLS
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Photolysis of the nitrochromenes followed by acidic hydrolysis of the photoproducts yields the corresponding flavonols in high yields.
- Rao, Sudhakar T.,Singh, Anil Kumar,Trivedi, Girish Kumar
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p. 1377 - 1382
(2007/10/02)
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