Two naphthoquinones from Rubia cordifolia

Phytochemistry
1992.0

Abstract

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 comparisons with synthetic compounds.

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