Five new diterpenoids isolated from Siegesbeckia pubescens, pubesides A similar toE, were established as ent-2 alpha ,15,16-trihydroxypimar-8(14)-en-2-O-beta -D-glucopyranoside (1), ent-15,16,19-trihydroxypimar-8(14)-...Five new diterpenoids isolated from Siegesbeckia pubescens, pubesides A similar toE, were established as ent-2 alpha ,15,16-trihydroxypimar-8(14)-en-2-O-beta -D-glucopyranoside (1), ent-15,16,19-trihydroxypimar-8(14)-en-19-O-beta -D-glucopyranoside (2), beta -D-glucopyranosyl-ent-15,16-dihydroxypimar-8(14)-en-19-oiclate (3), ent-2-oxo-15,16,19-trihydroxypimar-8(14)-en-19-O-beta -D-gluco-pyranoside (4), ent-2-oxo-15,16,19-trihydroxypimar-8(14)-en-19-O-beta -D-glucopyranoside-15,16-acetonide (5) by 1D and 2D NMR techniques.展开更多
Two new diterpenoid glucosides, cleroserroside A and cleroserroside B, were isolatedfrom the aerial pans of Clerodendrum serratum var. amplexghlium Moldenke. Their structureswere characterized by spectral and chemical...Two new diterpenoid glucosides, cleroserroside A and cleroserroside B, were isolatedfrom the aerial pans of Clerodendrum serratum var. amplexghlium Moldenke. Their structureswere characterized by spectral and chemical methods.展开更多
A new diterpenoid trisaccharide, smithoside A, was isolated from Aster smithianus. Itsstructure was identified as pimar-15 (16)-β-en-3β, 8β, 11α-triol-3-O-β-D-glucopyranosyl (1→3)-[β-glucopyranosyl (1→2)]-β-D...A new diterpenoid trisaccharide, smithoside A, was isolated from Aster smithianus. Itsstructure was identified as pimar-15 (16)-β-en-3β, 8β, 11α-triol-3-O-β-D-glucopyranosyl (1→3)-[β-glucopyranosyl (1→2)]-β-D-glucopyranoside on the basis of the spectral and chemical methods.展开更多
A diterpenoid trisaccharide, smithoside A, and a saponin, smithoside B, as well as six known compounds, apigenin, apigenin-7-O-glucoside, daucosterol, shanzhiside methyl ester, 8-acetylshanzhiside methyl ester and act...A diterpenoid trisaccharide, smithoside A, and a saponin, smithoside B, as well as six known compounds, apigenin, apigenin-7-O-glucoside, daucosterol, shanzhiside methyl ester, 8-acetylshanzhiside methyl ester and acteoside, were isolated from Aster smithianus. On the basis of spectral evidence and chemical analytical results, smithosides A and B were identified as pimar-1 5 （ 16 ） -β-ene-8β, 11 α-diol-3β-O-β-D-glucopyranosyl （ 1→3 ） - [ β-glucopyranosyl（ 1 →2 ） ] -β-D-glucopyranoside and 2β,3β, 16β,21β,23-pentahydroxy-12-ene-28 oleanoic acid lactone-3-O-β-D- glucopyranosyl （ 1→3 ） -β-D-glucopyranoside, respectively.展开更多
基金Projec twas supported by the Applied Basic Research Foundation of Yunnan Province (97C089M).
文摘Five new diterpenoids isolated from Siegesbeckia pubescens, pubesides A similar toE, were established as ent-2 alpha ,15,16-trihydroxypimar-8(14)-en-2-O-beta -D-glucopyranoside (1), ent-15,16,19-trihydroxypimar-8(14)-en-19-O-beta -D-glucopyranoside (2), beta -D-glucopyranosyl-ent-15,16-dihydroxypimar-8(14)-en-19-oiclate (3), ent-2-oxo-15,16,19-trihydroxypimar-8(14)-en-19-O-beta -D-gluco-pyranoside (4), ent-2-oxo-15,16,19-trihydroxypimar-8(14)-en-19-O-beta -D-glucopyranoside-15,16-acetonide (5) by 1D and 2D NMR techniques.
文摘Two new diterpenoid glucosides, cleroserroside A and cleroserroside B, were isolatedfrom the aerial pans of Clerodendrum serratum var. amplexghlium Moldenke. Their structureswere characterized by spectral and chemical methods.
文摘A new diterpenoid trisaccharide, smithoside A, was isolated from Aster smithianus. Itsstructure was identified as pimar-15 (16)-β-en-3β, 8β, 11α-triol-3-O-β-D-glucopyranosyl (1→3)-[β-glucopyranosyl (1→2)]-β-D-glucopyranoside on the basis of the spectral and chemical methods.
基金Supported by the National Natural Science Foundation of China(No.29272048).
文摘A diterpenoid trisaccharide, smithoside A, and a saponin, smithoside B, as well as six known compounds, apigenin, apigenin-7-O-glucoside, daucosterol, shanzhiside methyl ester, 8-acetylshanzhiside methyl ester and acteoside, were isolated from Aster smithianus. On the basis of spectral evidence and chemical analytical results, smithosides A and B were identified as pimar-1 5 （ 16 ） -β-ene-8β, 11 α-diol-3β-O-β-D-glucopyranosyl （ 1→3 ） - [ β-glucopyranosyl（ 1 →2 ） ] -β-D-glucopyranoside and 2β,3β, 16β,21β,23-pentahydroxy-12-ene-28 oleanoic acid lactone-3-O-β-D- glucopyranosyl （ 1→3 ） -β-D-glucopyranoside, respectively.
