Chemical constituents in Thunbergia from Africa].

To investigate the chemical compounds from the ethanol extract with inhibitory effects against aldose reductase from Thunbergia. Guided by anti-aldose reductase assay, compounds from the bioactive fraction (ethyl acetate extract) were separated and purified by various chromatographic methods including silica gel, Sephadex LH-20, and reversed-phase HPLC. Their structures were indentified based on analysis of the spectroscopic data including 1D and 2D NMR data. Eight compounds were obtained and identified as 8-hydroxy-8-methyl-9-methene-cyclopentane [7,11] -1,4, 6-trihydroxy-tetrahydronaphthalene-12-one, named as thunbergia A (1), 3,4-dihydro-4,5,8-trihydroxy-2-(3-methyl-2-butenyl) naphtha[2,3-b] oxiren-1(2H)-one (2), 8-(beta-gluco pyranosyloxy)-3,4-dihydro-2-(3-methyl-2-butenyl)naphtha [2,3-b] oxiren-1(2H)-one (3), galangin (4), quercetin (5), luteolin (6), 5,6,3',4'-tetrahydroxy -3,7-dimethoxy-flavone (7) and upeol (8). Thunbergia A was a new derivative of tetrahydronaphthalene, and compounds 2 and 3 were separated from the genus Thunbergia for the first time.

Citation

Feng-Jie Hung, Jian-Xiao Song, Jia-Jian Liu, Ai-Hu Zhao, Wei Jia. Chemical constituents in Thunbergia from Africa]. Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica. 2013 Apr;38(8):1183-7

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PMID: 23944032

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