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【期刊论文】Isoquinoline and isoindole alkaloids from Menispermum dauricum
叶文才, Xiaoqi Zhang a, Wencai Ye a, Shouxun Zhao a, Chun-Tao Che b, *
Phytochemistry 65 (2004) 929-932,-0001,():
-1年11月30日
Three isoquinoline alkaloids and an isoindole alkaloid, along with eight known compounds, were isolated from the roots of Menispermum dauricum (Menispermacese). The alkaloids were characterized as 7-hydroxy-6-methoxy-1(2H)-isoquinolinone, 6,7- dimethoxy-N-methyl-3,4-dioxo-1(2H)-isoquinolinone, 1-(4-hydroxybenzoyl)-7-hydroxy-6-methoxy-isoquinoline and 6-hydroxy-5-methoxy-N-methylphthalimide, on the basis of spectral evidence including 1D-and 2D-NMR and MS analyses.
Menispermum dauricum, Menispermaceae, Isoquinoline, Isoindole, Alkaloids
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【期刊论文】Two new flavonol glycosides from Gymnema sylvestre and Euphorbia ebracteolata
叶文才, Xin Liu, a, b, Wencai Ye, *, Biao Yu, Shouxun Zhao, Houming Wu a and Chuntao Che
Carbohydrate Research 339 (2004) 891-895,-0001,():
-1年11月30日
Two new flavonol glycosides, namely kaempferol 3-O-b-D-glucopyranosyl-(1fi4)-a-L-rhamnopyranosyl-(1fi6)-b-Dgalactopyranoside (1) and quercetin 3-O-600-(3-hydroxyl-3-methylglutaryl)-b-D-glucopyranoside (2), have been isolated from the aerial parts of Gymnema sylvestre and Euphorbia ebracteolata, respectively. Their structures were determined on the basis of chemical and spectroscopic methods.
Flavonol glycoside, Kaempferol 3-O-b-D-glucopyranosyl-(, 1fi4), -a-L rhamnopyranosyl-(, 1fi6), -b-D-galactopyranoside, Quercetin 3-O-600-(, 3-hydroxyl-3-methylglutaryl), -b-D-glucopyranoside, Gymnema sylvestre, Euphorbia ebracteolata
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叶文才, Chang-Xin Zhou, a, Jun-Yan Liu, Wen-Cai Ye, b, Chang-Hong Liu a and Ren-Xiang Tan a, *
Tetrahedron 59 (2003) 5743-5747,-0001,():
-1年11月30日
Bioassay-guided fractionation of the ethanol extract of the roots and rhizomes of Veratrum taliense yielded two new and thirteen known steroidal alkaloids. The structures of the two new compounds, neoverataline A and B, were established by extensive spectroscopic analyses to be 3,4-secocevane-4, 9-olid-14,15,16,20-tetra-ol-3-oic acid and 3, 4-secocevane-4, 9-olid-7, 14, 15, 16, 20-penta-ol-3-oic acid, respectively, and are a novel carbon skelton. All of the fifteen alkaloids were subjected to in vitro antifungal assays, which showed that the verazine- (veramitaline, stenophylline B, stenophylline B-3-O-b-D-glucopyranoside, veramiline-3-O-b-D glucopyranoside) and jerveratrum- type (jervine, jervine-3-O-b-D-glucopyranoside) alkaloids exhibited strong antifungal activities against the phytopathogenic fungus Phytophthora capisis with MICs of 160, 120, 160, 80, 80 and 120mg·L21, respectively. Furthermore, the verazine-type alkaloids stenophylline B, stenophylline B 3-O-b-D-glucopyranoside and veramiline 3-O-b-D-glucopyranoside were shown to also inhibit the growth of another fungal phytopathogen Rhizoctonia cerealis with MICs of 160, 120 and 120mg mL21. The MICs of triadimefon (an antifungal agrochemical used herein as a positive control) against P. capisis and R. cerealis were 120 and 80mg mL21, respectively. A preliminary structure–activity relationship regarding these alkaloids has been formulated.
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叶文才, Ren-Wang Jiang, a, Po-Ming Hon, b, Paul Pui-Hay But, Hoi-Sing Chung, c, Ge Lin, Wen-Cai Ye d and Thomas C. W. Mak a, *
Tetrahedron 58 (2002) 6705-6712,-0001,():
-1年11月30日
Two new stenine-type alkaloids, neotuberostemonol (3) and neotuberostemoninol (4), along with the known compound neotuberostemonine (2), were isolated from Stemona tuberosa Lour. Their structures were characterized by X-ray crystallography in combination with spectroscopic methods, and their absolute configurations were inferred from the known configuration of tuberostemonine (1). In the crystalline state, weak C-H O hydrogen bonds play an important role in the molecular packing of 3 and 4. q 2002 Elsevier Science Ltd. All rights reserved.
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【期刊论文】Oleanane saponins from Gymnema sylvestre
叶文才, Wen-Cai Ye a, b, Qing-Wen Zhang b, Xin Liu b, Chun-Tao Che a, c, *, Shou-Xun Zhao
Phytochemistry 53 (2000) 893-899,-0001,():
-1年11月30日
Six oleanane-type saponins, along with two known triterpene saponins, were isolated from the leaves of Gymnema sylvestre. The structures of the oleanane triterpene glycosides were characterized as longispinogenin 3-O-b-D-glucuronopyranoside, 21b-benzoylsitakisogenin 3-O-b-D-glucuronopyranoside, 3-O-b-D-glucopyranosyl(146)-b-D-glucopyranosyl oleanolic acid 28-O-b-D- glucopyranosyl ester, oleanolic acid 3-O-b-D-xylopyranosyl(146)-b-D-glucopyranosyl(146)-b-D-glucopyranoside, 3-O-b-D- xylopyranosyl(146)-b-D-glucopyranosyl(146)-b-D-glucopyranosyl oleanolic acid 28-O-b-D-glucopyranosyl ester and 3-O-b-D- glucopyranosyl(146)-b-D-glucopyranosyl oleanolic acid 28-b-D-glucopyranosyl(146)-b-D-glucopyranosyl ester on the basis of hydrolysis and spectral evidence, including 1D- and 2D-NMR (TOCSY, ROESY, HMQC and HMBC) and FABMS analyses. 72000 Elsevier Science Ltd. All rights reserved.
Gymnema sylvestre, Asclepiadaceae, Oleanane saponins
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