Molecules 2011, 16(2), 1418-1425; doi:10.3390/molecules16021418
Article

A Convenient and Safe O-Methylation of Flavonoids with Dimethyl Carbonate (DMC)

* email,  and
Received: 16 November 2010; in revised form: 23 January 2011 / Accepted: 27 January 2011 / Published: 9 February 2011
(This article belongs to the Special Issue Phenolics and Polyphenolics)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: 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).
Keywords: methylated flavonoids; ecofriendly methylation reaction; dimethyl carbonate (DMC); green chemistry
PDF Full-text Download PDF Full-Text [165 KB, uploaded 18 June 2014 19:36 CEST]

Export to BibTeX |
EndNote


MDPI and ACS Style

Bernini, R.; Crisante, F.; Ginnasi, M.C. A Convenient and Safe O-Methylation of Flavonoids with Dimethyl Carbonate (DMC). Molecules 2011, 16, 1418-1425.

AMA Style

Bernini R, Crisante F, Ginnasi MC. A Convenient and Safe O-Methylation of Flavonoids with Dimethyl Carbonate (DMC). Molecules. 2011; 16(2):1418-1425.

Chicago/Turabian Style

Bernini, Roberta; Crisante, Fernanda; Ginnasi, Maria Cristina. 2011. "A Convenient and Safe O-Methylation of Flavonoids with Dimethyl Carbonate (DMC)." Molecules 16, no. 2: 1418-1425.

Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert