Terpenoids-LXXI: constituents of Indian black dammar resin

Abstract

Some of the components of the Indian black dammar resin obtained from the tree Canarium strictum Roxb., have been isolated mainly by employing solvent partition and column chromatography. The petroleum ether extract of the methanol-soluble portion contains (+) junenol (III), a new monoethynoid sesquiterpene ketone canarone(IV), a liquid sesquiterpene alcohol epi-khusinol (V), α-amyrin(Ia), β-amyrin(IIa), β-amyrin acetate, ψ-taraxasterol (VIa), its related newly isolated diol ψ-epitaraxastane diol (VIIIa) and the new ketol (VII), along with another new triterpene diol very closely resembling, 11-β-hydroxy-α-amyrin (IXa). Petroleum ether extract of the methanol insoluble portion was found to contain α-amyrin, β-amyrin and 11-keto-α-amyrin (Xa).