Shao-peng Wei

Learn More
The larvicidal activity of crude petroleum ether, ethyl acetate, and methanol extracts of the whole plants of Phryma leptostachya L. was assayed for its toxicity against the early fourth instar larvae of Culex pipiens pallens. The larval mortality was observed after 24 h of exposure. Among three solvent extracts from Phyrma leptostachya L., the petroleum(More)
Microbial transformation of diosgenin (3β-hydroxy-5-spirostene) using white-rot fungus Coriolus versicolor afforded four previously unreported polyhydroxylated steroids, 25(R)-spirost-5-en-3β,7α,15α,21-tetraol (5), 25(R)-spirost-5-en-3β,7β,12β,21-tetrol (6), (25R)-spirost-5-en-3β,7α,12β,21-tetraol (7), and (25R)-spirost-5-en-3β,7β,11α,21-tetraol (8), along(More)
For the first time, a set of (43) natural sesquiterpene polyol esters isolated from the root bark of Celastrus angulatus Maxim and Euonymus japonicus Thunb were subjected to 3D-QSAR comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA) studies, with the aim of proposing novel sesquiterpene-based(More)
A new insecticidal lignan, phrymarolin B, was isolated from the whole plants of Phryma leptostachya L. Its structure was elucidated as 1-hydroxy-2-(3′,4′-methylenedioxy)phenoxy-6-(2″-hydroxy-3″,4″-methylenedioxy)phenyl-3,7-dioxabicyclo[3.3.0]octane mainly by analyses of NMR and MS spectral data. Phrymarolin B was evaluated for insecticidal activity against(More)
Agrochemical research, over the last two decades, has resulted in the discovery of chemically novel insecticides, of which steroids-based compounds that mimic the action of hormones have been considered as safe insecticides. In this study, eight steroidal C-17 pyrazolinyl derivatives were resynthesized through molecular hybridization and their insecticidal(More)
From the water-soluble portion of the methanol extract of stems of Ficus tikoua Bur., a new benzofuran glucoside, named 6-carboxyethyl-5-hydroxybenzofuran 5-O-β-d-glucopyranoside (1), together with one known benzofuran glucoside (2) were isolated. Their structures were elucidated by 1D and 2D ((1)H-(1)H COSY, HMQC, and HMBC) NMR spectroscopy and HRMS(More)
0009-3130/12/4803-0484 2012 Springer Science+Business Media, Inc. 1) Institute of Pesticides, Northwest A&F University, Yangling, 712100, Shaanxi, P. R. China, fax: +86-29-87093987, e-mail: wuwenjun@nwsuaf.edu.cn; 2) College of Sciences, Northwest A&F University, Yangling, 712100, Shaanxi, P. R. China. Published in Khimiya Prirodnykh Soedinenii, No. 3,(More)
Ficus tikoua (Bur.), a woody plant of the Moraceae family, is widely distributed in south China, India, Vietnam, and Laos. Its principal pharmacological properties include anti-inflammatory [1–3], antioxidant [4–6], cytotoxic [7, 8], antibacterial [1], and antifungal [9]. Previous studies show that the extracts of the plant exhibit excellent antifungal(More)
The essential oil from the roots of Bupleurum longiradiatum, obtained by hydro-distillation was analyzed by gas chromatography/mass spectrometry (GC/MS) and evaluated for antimicrobial activity and antioxidant activity. Fifty-one compounds were identified, representing 99.3% of the total oil. The major constituents were thymol (7.0%), butylidene phthalide(More)
A new sesquiterpene polyol ester with a beta-dihydroagarofuran skeleton, NW37 (1), and three known compounds NW13 (2), NW16 (3) and NW35 (4) were isolated by bioassay-guided fractionation from the highly polar MeOH extracts of the root bark of Celastrus angulatus. Their chemical structures were elucidated mainly by analyses of MS and NMR spectral data. The(More)