Triterpene Glycosides from the Leaves of Pittosporum angustifolium

Abstract

Phytochemical investigation of the leaves of Pittosporum angustifolium resulted in the isolation and structural elucidation of nine new triterpene saponins, named pittangretosides A-I (1–9), together with a known compound (10). Mainly by NMR and HRESIMS experiments, eight compounds were identified as A₁-barrigenol glycosides (1–7, 10), whereas two compounds exhibited an unusual 17,22-seco-backbone of oleanolic acid (8, 9). All compounds were evaluated for their in vitro cytotoxicities against human urinary bladder carcinoma cells (5637). Only compounds with an angeloyl-residue at C-22 of the aglycone (1–4 and 10) showed antiproliferative effects with IC₅₀ values of 4.1, 5.2, 2.1, 17.9, and 2.4 µM, respectively.

Key words

Pittosporum angustifolium - Pittosporaceae - A₁-barrigenol - seco-glycosides - pittangretosides

• References

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