The glucosides of Butea monosperma

Abstract

A reinvestigation of the flowers of Butea monosperma revealed the presence of seven flavonoid glucosides. Two of them are butrin and isobutrin, which have been isolated earlier from the plant. Three glucosides have been identified as coreopsin, isocoreopsin and sulphurein. The remaining two are new and have been assigned the structures IX (monospermoside) and X (isomonospermoside). The glucosides III, IV, IX, and X have been synthesized. The shift in the u.v. spectrum of 3-hydroxy-2′,4,4′-trimethoxy chalcone, on addition of alkali, is similar to what has been earlier noted with 2′-hydroxychalcones.