Chemical constituents from the heartwood of Dalbergia bariensis Pierre ex Prain and their chemotaxonomic significance

Phytochemical investigation on the heartwood of Dalbergia bariensis led to the isolation and identification of 18 compounds, including one previously undescribed compound ( 1 ) and 17 known compounds ( 2-18 ). These isolated compounds were categorized into three major classes: one α -diketone ( 1 ), two coumarins ( 2 – 3 ), and fifteen flavonoids as well as their derivatives ( 4 – 18 ). Among the known compounds, compounds 3 , 8-9 , 11 and 18 were obtained from D . bariensis for the first time, whereas compound 10 was reported for the first time in the genus Dalbergia . Structural elucidation of the isolated compounds was accomplished primarily by means of NMR spectroscopy, HRMS, and comparison with prior literature. This study complements the chemical composition of D . bariensi s and discusses the chemotaxonomic significance of these isolated secondary metabolites.