From the Cameroonian plant Combretum bracteatum (Laws.) Engl. and Diels a new compound, β-D-glucopyranosyl 3β,19α-dihydroxy-2-oxo-urs-12-en-28-oate, was isolated along with three known ursane and oleane triterpenes and two galactopyranosyl lipids. This represents the first example of a naturally occurring 2-oxo-urs-12-enoic acid derivative.
WickensGE. (1973) Flora of Tropical East Africa. Combretaceae., Whitefriars Press Ltd, London and Tonbridge, UK.
2.
RogersCB, VerottaL. (1996) Chemistry and biological properties of the African Combretaceae. In Chemistry and Pharmacological Properties of African Medicinal Plants. HostettmannK, ChinyangangaF, MaillardM, WolfenderJ-L (Eds). University of Zimbabwe Publications, Harare, Zimbabwe.
3.
CirlaA, MannJ. (2003) Combretastatins: from natural products to drug discovery. Natural Product Reports, 20, 558–564.
4.
BisoliE, GarcezWS, HamerskiL, TieppoC, GarcezFR. (2008) Bioactive pentacyclic triterpenes from the stems of Combretum laxum. Molecules13, 2717–2728 and references cited therein.
5.
BurkillHM. (1985) The Useful Plants of West Tropical Africa, Vol 1. Royal Botanic Gardens, Kew, UK.
6.
HigashiO, TakagakiT, KoshimizuK, WatanabeK, KajiM, HoshinoJ, NishidaT, HuffmanMA, TakasakiH, JatoJ, MuanzaDN. (1991) Biological activities of plant extracts from tropical Africa. African Study Monographs, 12, 201–210.
7.
NgueyemTA, BrusottiG, MarrubiniG, GrisoliP, DacarroC, VidariG, VitaFinzi P, CaccialanzaG. (2008) Validation of use of a traditional remedy from Bridelia grandis (Pierre ex Hutch) stem bark against oral Streptococci. Journal of Ethnopharmacology, 120, 13–16.
8.
JohnsSR, LambertonJA, MortonTC, SuarezH, WillingRI. (1983) Triterpenes of Lantana tiliaefolia. 24-Hydroxy-3-oxours-12-en-28-oic acid, a new triterpene. Australian Journal of Chemistry, 36, 2537–2547.
9.
DurhamDG, LiuX, RichardsRME. (1994) A triterpene from Rubus pinfaensis. Phytochemistry36, 1469–1472.
10.
SetoT, TanakaT, TanakaO, NaruhashiN. (1984) β-Glucosyl esters of 19α-hydroxyursolic acid derivatives in leaves of Rubus species. Phytochemistry, 23, 2829–2834.
AgrawalPK. (1992) NMR spectroscopy in the structural elucidation of oligosaccharides and glycosides. Phytochemistry, 31, 3307–3330.
13.
BoydJ, TurveyJR. (1978) Identification by 13C-n.m.r. spectroscopy of oligosaccharides derived from alginic acid. Carbohydrate Research, 61, 223–226.
14.
KunuAP, MahatoSB. (1993) Triterpenoids and their glucosides from Terminalia chebula. Phytochemistry32, 999–1002.
15.
AdnyanaIK, TezukaY, AwaleS, BanskotaAH, TranKQ, KadotaS. (2000) Quadranosides VI–XI, six new triterpene glucosides from the seeds of Combretum quadrangulare. Chemical & Pharmaceutical Bulletin, 48, 1114–1120.
16.
GalloMBC, da SilvaFC, VieiraPC, FernandesJBF, da SilvaMFdasGF. (2006) New natural products from Siphoneugena densiflora Berg (Myrtaceae) and their chemotaxonomic significance. Journal of Brazilian Chemical Society, 17, 279–288.
17.
AdnyanaIK, TezukaY, BanskotaAH, XiongQ, TranKQ, KadotaS. (2000) Quadranosides I–V, new triterpene glucosides from the seeds of Combretum quadrangulare. Journal of Natural. Products63, 496–500.
18.
OlugbadeTA, AdesanyaSA. (2000) Prieurianoside, a protolimonoid glucoside from the leaves of Trichilia prieuriana. Phytochemistry54, 867–870.
19.
HaukssonJB, BergqvistMHJ, RilforsL. (1995) Structure of digalactosyldiacylglycerol from oats. Chemistry and Physics of Lipids, 78, 97–102.
20.
MorimotoT, NagatsuA, MurakamiN, SakakibaraJ, TokudaH, NishinoH, IwashimaA. (1995) Anti-tumour-promoting glyceroglycolipids from the green alga Chlorella vulgaris. Phytochemistry40, 1433–1437.
21.
WangR, FurumotoT, MotoyamaK, OkazkiK, KondoA, FukuiH. (2002) Possible antitumor promoters in Spinacia oleracea (spinach) and comparison of their contents among cultivars. Bioscience, Biotechnology, and Biochemistry, 66, 248–254.
22.
KuriyamaI, MusumiK, YonezawaY, TakemuraM, MaedaN, IijimaH, HadaT, YoshidaH, MizushinaY. (2005) Inhibitory effects of glycolipids fraction from spinach on mammalian DNA polymerase activity and human cancer cell proliferation. The Journal of Nutritional Biochemistry, 16, 594–601.
23.
LallemandJY, DuteilM. (1977) 13C n.m.r. spectra of quercetin and rutin. Organic Magnetic Resonance, 9, 179–180.
24.
GoodmanRA, OldfieldE, AllerhandA. (1973) Assignments in the natural-abundance carbon-13 nucler magnetic resonance spectrum of chlorophyll a and a study of segmental motion in neat phytol. Journal of the American Chemical Society, 95, 7553–7555.
