Two new C21 steroidal glycosides, cynanauriculoside I and cynanauriculoside II, were isolated from the roots of Cynanchum aurichulatum. Their structures were established using spectroscopic methods including one and ...Two new C21 steroidal glycosides, cynanauriculoside I and cynanauriculoside II, were isolated from the roots of Cynanchum aurichulatum. Their structures were established using spectroscopic methods including one and two-dimensional NMR.展开更多
Arbutin was synthesized from glucose by two-step reaction below: (a) 2,3,4,6-tetra-O-acetyl-α-D-glucosyl chloride or bromide was prepared by glucose and acetyl halide (chloride or bromide), (b) 2,3,4,6-tetra-O-ace-t...Arbutin was synthesized from glucose by two-step reaction below: (a) 2,3,4,6-tetra-O-acetyl-α-D-glucosyl chloride or bromide was prepared by glucose and acetyl halide (chloride or bromide), (b) 2,3,4,6-tetra-O-ace-tyl-α-D-glucosyl halide (Cl, Br) reacted with hydroquinone, methanol as solvent at pH=9.5-10.0.展开更多
A new C21-steroidal glycoside with two known compounds were isolated from the root of Cynanchum Stauntonii. Based on the spectral analysis, including MS, 1H NMR, 13C NMR, DEPT, 1H-1H COSY, 13C-1H COSY, HMQC and HMBC, ...A new C21-steroidal glycoside with two known compounds were isolated from the root of Cynanchum Stauntonii. Based on the spectral analysis, including MS, 1H NMR, 13C NMR, DEPT, 1H-1H COSY, 13C-1H COSY, HMQC and HMBC, their chemical structures were determinated as glaucogenin-C 3-O-α-L-cymaropyranosyl-（1→ 4）-β-o-digitoxopyranosyl-（1→4）-β-D-canaropyranoside （1）, stigmasterol （2） and ursolic acid （3）.展开更多
Two new methane-type monoterpene glycosides were isolated from the roots of Doellingeria scaber. Their structures were identified as trans-p-menthane-1α,2β,8-triol 8-O-β-D-（3′,6′-diangeloyloxy）-glucopyranoside ...Two new methane-type monoterpene glycosides were isolated from the roots of Doellingeria scaber. Their structures were identified as trans-p-menthane-1α,2β,8-triol 8-O-β-D-（3′,6′-diangeloyloxy）-glucopyranoside and trans-p-menthane-1α,2β,8-triol 8-O-β-D-（3′-angeloyloxy,6′-isobutyloxy）-glucopyranoside based on 1D and 2D NMR spectroscopy.展开更多
A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by...A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by spectral evidences, especially by 2 D techniques.展开更多
Two new acetylxylosides, ent-manool-13-O-β-D-2'-acetylxylopyranoside (1) and ent-manool-13-O-β-D-2', 4'-diacetylxylopyranoside (2) were isolated from Aster veitchianus. Their structures were elucidated b...Two new acetylxylosides, ent-manool-13-O-β-D-2'-acetylxylopyranoside (1) and ent-manool-13-O-β-D-2', 4'-diacetylxylopyranoside (2) were isolated from Aster veitchianus. Their structures were elucidated by spectroscopic methods.展开更多
文摘Two new C21 steroidal glycosides, cynanauriculoside I and cynanauriculoside II, were isolated from the roots of Cynanchum aurichulatum. Their structures were established using spectroscopic methods including one and two-dimensional NMR.
文摘Arbutin was synthesized from glucose by two-step reaction below: (a) 2,3,4,6-tetra-O-acetyl-α-D-glucosyl chloride or bromide was prepared by glucose and acetyl halide (chloride or bromide), (b) 2,3,4,6-tetra-O-ace-tyl-α-D-glucosyl halide (Cl, Br) reacted with hydroquinone, methanol as solvent at pH=9.5-10.0.
文摘A new C21-steroidal glycoside with two known compounds were isolated from the root of Cynanchum Stauntonii. Based on the spectral analysis, including MS, 1H NMR, 13C NMR, DEPT, 1H-1H COSY, 13C-1H COSY, HMQC and HMBC, their chemical structures were determinated as glaucogenin-C 3-O-α-L-cymaropyranosyl-（1→ 4）-β-o-digitoxopyranosyl-（1→4）-β-D-canaropyranoside （1）, stigmasterol （2） and ursolic acid （3）.
基金supported by the Henan Province Science and Technology Foundation of China(No.001170724).
文摘Two new methane-type monoterpene glycosides were isolated from the roots of Doellingeria scaber. Their structures were identified as trans-p-menthane-1α,2β,8-triol 8-O-β-D-（3′,6′-diangeloyloxy）-glucopyranoside and trans-p-menthane-1α,2β,8-triol 8-O-β-D-（3′-angeloyloxy,6′-isobutyloxy）-glucopyranoside based on 1D and 2D NMR spectroscopy.
文摘A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by spectral evidences, especially by 2 D techniques.
文摘Two new acetylxylosides, ent-manool-13-O-β-D-2'-acetylxylopyranoside (1) and ent-manool-13-O-β-D-2', 4'-diacetylxylopyranoside (2) were isolated from Aster veitchianus. Their structures were elucidated by spectroscopic methods.
