草玉梅中的化学成分

从草玉梅根部和地上部分甲醇提取物中分离到的8个化合物,其中三萜内酯(7)和三萜皂甙(8)为新化合物.     

Napelline-type C_(20)-diterpenoid alkaloid iminiums from an aqueous extract of ‘‘fu zi': Solvent-/base-/acid-dependent transformation and equilibration between alcohol iminium and aza acetal forms

Three new napelline-type C₂₀-diterpenoid alkaloids, named aconicarmichinium A and B trifluoroacetates (1 and 2) and aconicarmichinium C chloride (3), were isolated from an aqueous extract of “fu zi”, the lateral roots of Aconitum carmichaelii. Their structures were elucidated by extensive spectroscopic data analysis. Compounds 1-3 represent the first examples of napelline-type C₂₀-diterpenoid alkaloid alcohol iminiums, of which the structures were fully characterized. In addition, transformation and equilibration between the alcohol iminiums (1-3) and the aza acetals 1a-3a were investigated by measurements of the NMR spectra in protic and aprotic deuteriumsolvents including alkali pyridine-d₅, along with evaporation under reduced pressure and gradual additions of TFA, AcOH, and HCl. The results demonstrated that the transformation and equilibration were solvent-, base-, and acid-dependent. Especially, in aqueous biological fluid, these C₂₀-diterpenoid alkaloids would more likely exist as the alcohol iminiums accompanied by anion counterparts in biosystems to increase their solubility, bioavailability, transportations, and functions. The absolute configurations of 1-3 were confirmed by X-ray crystallographic analysis of 2a.     

Arcutin — A new type of diterpene alkaloids

The structure of the diterpene alkaloid arcutin, which is isolated fromAconitum arcuatum Maxim. (Ranunculaceae), is solved by x-ray methods. Arcutin represents a new type of diterpene alkaloids containing a C5–C20 bond instead of the traditional C10–C20 bond in the carbon backbone.Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 62–65, January–February, 2000.     

New C_(19)-Diterpenoid Alkaloids from the Roots of Delphinium

Three new C_(19)-diterpenoid alkaloids, giraldines A (1), B (3)and C (4), were isolated from the roots of Delphinium giraldiiDiels, together with three known C_(19)-diterpenoid alkaloids, di-hydrogadesine (5), tatsiensine (6) and siwanine A (7), as wellas their structures were elucidated by chemical evidence andspectral analyses, including IR, MS, 1D NMR and 2D NMR.     

New C19－Diterpenoid Alkaloids from the Roots of Delphinium Giraldii

Three new C19-diterpenoid alkaloids, giraldines A (1), B (3) and C (4), were isolated from the roots of Delphinium giraldii Diels, together with three known C19-diterpenoid alkaloids, dihydrogadesine (5), tatsiensine (6) and siwanine A (7), as well as their structures were elucidated by chemical evidence and spectral analyses, including IR, MS, 1D NMR and 2D NMR.     

Three New Cycloartane Triterpene Glycosides from Actaea asiatica

Three new cycloartane triterpene glycosides were isolated from the rhizomes of Actaea asiatica. Their structures were elucidated as 25-ethoxyl-cimigenol-3-O-β-D-xylopyranoside 1, 2'-O-acetyl soulieoside C 2, 2'-O-acetyl cimiracemoside M 3.     

New triterpenoid glycosides fromThalictrum minus L.

From the terrestrial part ofThalictrum minus L. (Ranunculaceae) a novel triterpenoid diglycoside was isolated. The genin of this glycoside is a new cycloartane triterpenoid. The structure of the glycoside was established on the basis of 1D and 2D NMR spectroscopy and FAB mass spectrometry as 22S,25-epoxy-3-O-β-d-galactopyranosyl-29-O-β-d-glucopyranosyl-9β, 19-cyclo-20S-lanostane-3β,16β,24S,29-tetrol. For Part 10 see Ref. 1. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 602–605, March, 1999.     

Shawurensine,a new C<Subscript>19</Subscript>-diterpenoid alkaloid from <Emphasis Type="Italic">Delphinium shawurense</Emphasis>

The new norditerpenoid alkaloid shawurensine in addition to β-sitosterol and the known alkaloids elatin, delbrulin, and methyllycaconitine were isolated from Delphinium shawurense. A structure for shawurensine was proposed based on spectral data. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 248–250, May–June, 2007.     

Alkaloids of Aconitum coreanum. X. Curare-Like Activity-Structure Relationship

The biological activity of 11 alkaloids isolated from Aconitum coreanum was studied. The compounds exhibit myorelaxant activity. Isoatisine and coryphine, which contain oxazolidine rings, are the most active. N-Oxides of 2-isobutyryl-14-hydroxyhetisine and 2-isobutyryl-13-acetyl-14-hydroxyhetisine are least active.     

Diterpenoid Alkaloids from Aconitum racemulosum Franch var. pengzhouense

FromthewholeplantsofAconitumracemulosumFranchvar.pengzhounense,wehaveisolatedanewditerpenoidalkaloidracemulodinel,togetherwithatisinumhydrochloride,isotalatizidine,nevadenine,virescenine,14-acetylvirescenineandanthranoyllycoctonine'.Inthispaper,wereportthestructuralelucidationofthenewditerpenoidalkaloidracemulodine1.Racemulodine12wasisolatedascolorlessneedles,anditsmolecularformula,C,,H=,NO.,inferredfromitsMSand13CNMRspectra.TheiRandNMRspectraofIrevealedthatitbelongstothehetidine-typedi…