Diterpenoid quinones and other constituents from the roots of Clerodendron tomentosum R.Br.

摘要

Chemical investigation of combined pet. ether and benzene fractions from the ethanolic extract of Clerodendron tomentosum R. Br. afforded three diterpenoid quinones, viz. 12-acetylroyleanone, royleanone and 6,7-dehydroroyleanone along with H-hexacosane, eicosanoic acid, (24S)-ethylchoIesta-5,22,25-triene-3β-ol, α-amyrin and oleanolic acid. This is the first report of the isolation of diterpenoid quinones from this plant, also 12-acetylroyleanone has been obtained for the first time from a natural source.