Synthesis and Purification of 7-Prenyloxycoumarins and Herniarin as Bioactive Natural Coumarins

7-prenyloxycoumarins including 7-isopentenyloxycoumarin, auraptene and umbelliprenin, and herniarin have been widely recognized as bioactive coumarins. This paper presents the ways to synthesis these compounds.7-prenyloxycoumarins were synthesized by reaction between 7-hydroxycoumarin (1 M) and relevant prenyl bromides (1.5 M) in acetone at room temperature. The reaction was carried out in the presence of DBU (1, 8-diazabicyclo [5.4.0] undec-7-ene) (2 M). After 24 hr, the mixture was concentrated under reduced pressure. The compounds were purified by column chromatography.Three bioactive 7-prenyloxycoumarins, namely, umbelliprenin, auraptene and 7-isopentenyloxycoumarin, together with herniarin were synthesized from 7-hydroxycoumarin under alkaline conditions (DBU) and then purified by column chromatography. The structures of the products were characterized by NMR spectroscopic method including 1H- and 13C-NMR experiments. The method of synthesis for 7-prenyloxycoumarins and herniarin which is presented here has not been reported yet. Moreover, for the first time, umbelliprenin was chemically prepared in this work.