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Title: A Convenient and Safe O-Methylation of Flavonoids with Dimethyl Carbonate (DMC)
Authors: Bernini, Roberta
Crisante, Fernanda
Ginnasi, Maria Cristina
Keywords: Methylated flavonoids;Ecofriendly methylation reaction;Dimethyl carbonate (DMC);Green chemistry
Issue Date: 2011
Publisher: MPDI
Source: Bernini R., Crisante F., Ginnasi M.C. 2011. A convenient and safe O-methylation of flavonoids with dimethyl carbonate (DMC). "Molecules" 16(2): 1418-1425
Dietary flavonoids exhibit beneficial health effects. Several epidemiological studies have focused on their biological activities, including antioxidant, antibacterial, antiviral, anti-inflammatory and cardiovascular properties. More recently, these compounds have shown to be promising cancer chemopreventive agents in cell culture
studies. In particular, O-methylated flavonoids exhibited a superior anticancer activity than the corresponding hydroxylated derivatives being more resistant to the hepatic metabolism and showing a higher intestinal absorption. In this communication we describe a convenient and efficient procedure in order to prepare a large panel of mono- and dimethylated flavonoids by using dimethyl carbonate (DMC), an ecofriendly and non toxic chemical, which plays the role of both solvent and reagent. In order to promote the methylation reaction under mild and practical conditions, 1,8-diazabicyclo[5.4.0]undec-7-
ene (DBU) was added in the solution; methylated flavonoids were isolated in high yields and with a high degree of purity. This methylation protocol avoids the use of hazardous and high toxic reagents (diazomethane, dimethyl sulfate, methyl iodide).
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ISSN: 1420-3049
DOI: 10.3390/molecules16021418
Appears in Collections:DABAC - Archivio della produzione scientifica

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