A new quinolizidine alkaloid. 3-(4-hydroxyphenyl)-4-(3-methoxy-4-hydroxyphenyl)-3,4-dihydroquinolizidine (1). was isolated from the ethanol extract of the whole plants of Boehmeria siamensis Craib. Its structure was e...A new quinolizidine alkaloid. 3-(4-hydroxyphenyl)-4-(3-methoxy-4-hydroxyphenyl)-3,4-dihydroquinolizidine (1). was isolated from the ethanol extract of the whole plants of Boehmeria siamensis Craib. Its structure was elucidated on the analysis of ID NMR and 2D NMR spectrum.展开更多
Two new compounds, melanochromone and 2-ethoxyl-2-(4-hydroxyphenyl)ethanol. were isolated from the whole plants of Melanosoiadum pimpinelloideum II. Boiss. The known compounds isolated were 1-(4-hydroxyphenyl)-1.2etha...Two new compounds, melanochromone and 2-ethoxyl-2-(4-hydroxyphenyl)ethanol. were isolated from the whole plants of Melanosoiadum pimpinelloideum II. Boiss. The known compounds isolated were 1-(4-hydroxyphenyl)-1.2ethanediol. tymine. cimifugin, umtatin. bergenin. daucosterol and stigmasterol. Their structures were determined on the basis of spectral data.展开更多
Two new diphyllin glycosides, mananthoside A (1) and B (2), together with six known compounds, were isolated from the ethanolic extract of the whole plants of Mananthes patentiflora. Their structures were determined o...Two new diphyllin glycosides, mananthoside A (1) and B (2), together with six known compounds, were isolated from the ethanolic extract of the whole plants of Mananthes patentiflora. Their structures were determined on the basis of chemical and spectral evidences.展开更多
Continuing investigation of Delphinium souliei Franch yielded two minor new diterpenoid alkaloids--souline E(1) and souline F(2), their structures were determined on the basis of spectroscopic evidences.
A minor new diterpenoid alkaloid, soulidine, was isolated from the roots of DelphiniumSouliei Franch, its structure was established on the basis of spectral evidences.
A novel tetrastilbene, davidol A, was isolated from the stems of Vitis davidii together with the previously known resveratrol, (+)-epsilon-viniferin; ampelopsin C; ampelopsin E; vitisin A and hopeaphenol. Its structur...A novel tetrastilbene, davidol A, was isolated from the stems of Vitis davidii together with the previously known resveratrol, (+)-epsilon-viniferin; ampelopsin C; ampelopsin E; vitisin A and hopeaphenol. Its structure was elucidated mainly by 1D and 2D NMR analyses.展开更多
The phytochemical investigation of Delphinium tongolense Franch. yielded two new diterpenoid alkaloids tongolenine C and tongolenine D. Their structures were elucidated by spectroscopical methods.
A new triterpenoid saponin, tomentoside (5), together with prosapogenin CP 4 (1),huzhangoside B (2), C (3) and D (4) was isolated from the ethanolic extract of Anemone tomentosa.its structure was established by spectr...A new triterpenoid saponin, tomentoside (5), together with prosapogenin CP 4 (1),huzhangoside B (2), C (3) and D (4) was isolated from the ethanolic extract of Anemone tomentosa.its structure was established by spectroscopic and chemical evidence.展开更多
Using oxidation with KMnO4. KMnO4/acetone-H2O. NAS. followed by Polonovskyreaction and imine formation. the N-deethylation of six norditerpenoid alkaloids 6-epi-forsticille.yunnaconitine. 3. 13-diacetylyunnaconitine. ...Using oxidation with KMnO4. KMnO4/acetone-H2O. NAS. followed by Polonovskyreaction and imine formation. the N-deethylation of six norditerpenoid alkaloids 6-epi-forsticille.yunnaconitine. 3. 13-diacetylyunnaconitine. 13-dehydroxy-indaconitine. indaconitine and 3-acetylpseudaconine are reported in 36-60% yields.展开更多
文摘A new quinolizidine alkaloid. 3-(4-hydroxyphenyl)-4-(3-methoxy-4-hydroxyphenyl)-3,4-dihydroquinolizidine (1). was isolated from the ethanol extract of the whole plants of Boehmeria siamensis Craib. Its structure was elucidated on the analysis of ID NMR and 2D NMR spectrum.
基金We are indebted to Di-Ao Science Foundation for the financial support.
文摘Two new compounds, melanochromone and 2-ethoxyl-2-(4-hydroxyphenyl)ethanol. were isolated from the whole plants of Melanosoiadum pimpinelloideum II. Boiss. The known compounds isolated were 1-(4-hydroxyphenyl)-1.2ethanediol. tymine. cimifugin, umtatin. bergenin. daucosterol and stigmasterol. Their structures were determined on the basis of spectral data.
基金the financial support of Di-Ao Science Foundation.
文摘Two new diphyllin glycosides, mananthoside A (1) and B (2), together with six known compounds, were isolated from the ethanolic extract of the whole plants of Mananthes patentiflora. Their structures were determined on the basis of chemical and spectral evidences.
文摘Continuing investigation of Delphinium souliei Franch yielded two minor new diterpenoid alkaloids--souline E(1) and souline F(2), their structures were determined on the basis of spectroscopic evidences.
文摘A minor new diterpenoid alkaloid, soulidine, was isolated from the roots of DelphiniumSouliei Franch, its structure was established on the basis of spectral evidences.
文摘A novel tetrastilbene, davidol A, was isolated from the stems of Vitis davidii together with the previously known resveratrol, (+)-epsilon-viniferin; ampelopsin C; ampelopsin E; vitisin A and hopeaphenol. Its structure was elucidated mainly by 1D and 2D NMR analyses.
文摘The phytochemical investigation of Delphinium tongolense Franch. yielded two new diterpenoid alkaloids tongolenine C and tongolenine D. Their structures were elucidated by spectroscopical methods.
文摘A new triterpenoid saponin, tomentoside (5), together with prosapogenin CP 4 (1),huzhangoside B (2), C (3) and D (4) was isolated from the ethanolic extract of Anemone tomentosa.its structure was established by spectroscopic and chemical evidence.
文摘Using oxidation with KMnO4. KMnO4/acetone-H2O. NAS. followed by Polonovskyreaction and imine formation. the N-deethylation of six norditerpenoid alkaloids 6-epi-forsticille.yunnaconitine. 3. 13-diacetylyunnaconitine. 13-dehydroxy-indaconitine. indaconitine and 3-acetylpseudaconine are reported in 36-60% yields.
