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  • Title: Petersaponins III and IV, triterpenoid saponins from Petersianthus macrocarpus.
    Author: Olugbade TA, Ogundaini A, Birlirakis N, Païs M, Martin MT.
    Journal: J Nat Prod; 2000 May; 63(5):716-9. PubMed ID: 10843600.
    Abstract:
    Two new triterpenoid saponins, petersaponins III and IV (1 and 2), were isolated from an n-butanol extract of the bark of Petersianthus macrocarpus. They possess 21-O-benzoyl-22-O-acetylbarringtogenol C and 21-O-2-furoxyl-22-O-tigloylbarringtogenol C as the aglycon, respectively. For both 1 and 2, the trisaccharide moiety linked to C-3 of the aglycon consists of D-glucuronic acid, D-xylose, and D-galactose, while a L-rhamnose unit is linked to C-28. The structures of 1 and 2 were elucidated by extensive NMR experiments including (1)H-(1)H (COSY, HOHAHA, NOESY) and (1)H-(13)C (HMQC and HMBC) spectroscopy and by chemical evidence.
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