20950-52-1Relevant academic research and scientific papers
A convenient and safe O-methylation of flavonoids with dimethyl carbonate (DMC)
Bernini, Roberta,Crisante, Fernanda,Ginnasi, Maria Cristina
experimental part, p. 1418 - 1425 (2011/04/25)
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).
FLAVONOIDS IN ROOT BARK OF PONGAMIA PINNATA
Tanaka, Toshiyuki,Iinuma, Munekazu,Yuki, Kaoru,Fujii, Yuko,Mizuno, Mizuo
, p. 993 - 998 (2007/10/02)
Further investigation of the flaonoid constituents of Pongamia pinnata from Japan resulted in the isolation of 18 flavonoid compounds including nine new ones, ponganones III-XI, from its root bark.The new structures were determined to be (2S)-3',4'-dimeth
