首页|SECONDARY METABOLITES FROM STEM BARKS OF Catalpa bungei
SECONDARY METABOLITES FROM STEM BARKS OF Catalpa bungei
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Catalpa bungei C.A.Mey.(Bignoniaceae),a deciduous arbor species,is indigenous to western and middle regions of China,С bungei is an ancient ornamental woody plant widely used in landscaping.Wood of С bungei shows excellent mechanical performance and superior durability that can resist the corrosion caused by microorganisms and insects(1,2).Extracts of С bungei plant materials have long been used in Chinese folk remedies for treating,preventing,or alleviating various disorders or diseases,such as edema,nephritis,eczema,leprosy,cystitis,and gastric cancer(3).The literature indicates that С bungei leaves and seed oil show significant antioxidant and antitumor activities(2-4).Previous phytochemical study of seeds and leaves of С bungei led to the isolation of several classes of chemical constituents,including iridoids,triterpenoids,lignans,phenylethanoid,and flavonoids glycosides(3-6).However,screening of the secondary metabolites of the barks of this tree species has not been carried out to date.In this phytochemical investigation of С bungei,eight secondary metabolites were isolated from its stem barks,and their chemical structures were characterized as salirepin 7-O-benzoate(1),oleanolic acid(2),ursolic acid(3),luteolin(4),(+)-catechin(5),luteolin 7-O-β-D-glucopyranoside(6),quercetin 3-O-β-D-xylopyranoside(7),and quercetin 3-O-β-Z)-xylopyranosyI(1→2)-0-β-D-glucopyranoside(8)from their spectroscopic data,including NMR and MS,and by comparison of their spectroscopic data with literature values.It is worth noting that compounds 2,and 5-8 were identified in С bungei for the first time,while compounds 1,2,and 6-8 have never been isolated from the genus Catalpa previously.
Yeye Hu、Wei Liu、Huayu Liu
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Tianjin Key Laboratory of Pulp and Paper,Tianjin University of Science and Technology,300457,Tianjin,P R.China
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