Phenylcoumarins from Kielmeyera elata.

Abstract

Friedelin, the 4-phenylcoumarins mammeisin, 4-phenyl-5-hydroxy-6-(3-methyl-1-oxobutyl)-2'-(1-hydroxy-1-methylethyl)-3 ',4 ' -dihydro(5',4 ' :7,8) furancoumarin, and mammeigin have been puri®ed from the stem of Kielmeyera elata. These compounds have previously been reported for the same species. In addition, a new derivative of mammeigin has been isolated and identi®ed as 4-phenyl-5-hydroxy-6-(3-hydroxymethyl-1-oxo-butyl)-2 ' ,2 ' -dimethyl(6 ',5 ' :7,8)pyrancoumarin.