Sesquiterpene glycosides and triterpenes from the chloroform extract of Pittosporum pentandrum (Blanco) Merrill

• Main Author: Tierra, Diana S.
• Format: text
• Language: English
• Published: Animo Repository 1995
• Subjects: Medicinal plants; Plants; Useful; Extracts; Glycosides; Solution (Chemistry); Terpenes > Spectra; Chloroform > Spectra; Antibacterial agents; Chemistry
• Online Access: https://animorepository.dlsu.edu.ph/etd_masteral/1713
• Institution: De La Salle University

The choroform extract of Pittosporum pentandrum (Blanco) Merrill yielded a mixture of four sesquiterpene glycosides and another mixture of two triterpenes by gravity column chromatography (dry) packing. The structures of these constituents were elucidated by IR, 1H-NMR, 13C-NMR, DEPT, 1H-1H COSY sprectroscopy and mass spectrometry. On the basis of a formula index search, the proposed structures of the compounds are novel. The relative stereochemistry of the sesquiterpene glycosides were determined by a combination of coupling constants analyses and NOESY. The sesquiterpene glycosides were acetylated, and the derivatized products were analyzed by 1H-NMR to confirm the proposed structures.