TWO NAPHTHOQUINONES FROM RUBIA CORDIFOLIA

Article abstract of DOI:10.1016/0031-9422(92)83662-I

The methanol extract of Rubia cordifolia afforded two new naphthoquinones, 2-carbamoyl-3-methoxy-1,4-naphthoquinone and 2-carbamoyl-3-hydroxy-1,4-naphthoquinone, isolated along with a known naphthoquinone and naphthohydroquinone and six known anthraquinones.The structures of the new compounds were determined on the basis of spectroscopic data and direct comparison with synthetic compounds. Key words: Rubia cordifolia; Rubiaceae; Rubiae radix; naphthoquinone; anthraquinone.