Quinones from roots of Prismatomeris sessiliflora and Diospyros montana

Abstract

Phytochemical investigation of the roots of Prismatomeris sessiliflora Pierre ex Pitard (Runiaceae) led to the isolation of two pure compounds. They are the anthraquinones rubiadin and rubiadin-1-methyl ether. From the roots of Diospyros Montana Roxb. (Ebenaceae), four pure compounds were isolated. These compounds are the naphthoquinone diospyrin, the naphthalene derivative 5-hydroxy-4-methoxy-2-naphthaldehyde, and the triterpeniods lupeol and betulinic acid. The structures of all of these isolates were determined by comparison of their UV, IR, MS and NMR properties with previously reported values. The unequivocal ¹³C NMR assignments of these quinines, including the revision of the ¹H NMR assignments of rubiadin and ¹H and ¹³C NMR assignments of diospyrin, were reported.