Some of the components of the Indian black dammarresin 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)
Two new pentacyclic triterpenes of the taraxastane group have beenisolated from Canarium strictum Roxb. One is a ketol and the other a diol. Chemical evidence, IR, UV, NMR spectra and their mass spectral disintegration patterns show that they are represented by the structures I and IIa. They have been named as epi-ψ-taraxastanonol and epi-ψ taraxastane diol respectively.
Two new triterpenoids, 25(R)-3-oxo-24-methylene cycloartan-26-ol and psi-taraxastanonol have been isolated from the neutral fraction of the stem-bark of Mangifera indica (var/cv sarikhas). The acidic fraction of the same extract yielded three new tetracyclic triterpenoids, 3-oxo-23(R or S)-hydroxy cycloart-24-en-26-oic acid and both C-23 epimers of 3 beta,23-dihydroxy cycloart-24-en-26-oic acid. The structures were elucidated by spectroscopic and chemical methods. (C) 1999 Elsevier Science Ltd. All rights reserved.