Phytochemical constituents and chemosystematic significance of Pulicaria jaubertii E.Gamal-Eldin (Asteraceae)

Abstract The chemical characterization of methylene chloride/methanol (1:1) extract of the air-dried whole medicinal plant, Pulicaria jaubertii E. Gamal-Eldin, led to isolation and identification of two new hydroquinone compounds; 2-(2-acetoxy propyl), 5-methyl hydroquinone ( 1 ) and 2-(2-hydroxy propyl), 5-methyl hydroquinone-4- O - β-D -glucopyranoside ( 2 ), four known flavonols ( 3 - 6 ) and 7 known dihydroflavonols ( 7 - 13 ). The structures were established depending upon comprehensive analysis of the NMR, IR and HR/EI-MS data. Herein, compounds 6 , and 10-13 were isolated for the first time from this plant. The chemotaxonomic significance of the isolated flavonoids from P. jaubertii comparing with those reported from other Pulicaria species was also summarized.