Androstane‐Type Steroidal Glycoside from the Roots of Asparagus curillus Buch.‐Ham. ex Roxb.

The novel androstane‐type steroidal glycoside 1 was isolated from the roots of Asparagus curillus Buch .‐Ham . ex Roxb . Its structure was elucidated as (2α,3β,5α,17β)‐17‐(1‐methoxyethoxy)‐17‐methylandrostane‐2,3‐diol 3‐(β‐D ‐digitoxopyranoside) by means of chemical and advanced spectral analysis.     

A New Steroid Glycoside Derivative from Acorus Calamus L.

A new steroid glycoside derivative, 4′‐O‐docosanoyl‐3‐O‐β‐D‐glucosyl‐sitosterol, along with six known steroids has been isolated from the ethanol extract of the rhizoma of Acorus calamus L. The structures of the new and known compounds were established on the basis of extensive 1D and 2D NMR spectral data.     

芦笋根中菝葜皂甙元的气相色谱测定

芦笋根粉末经提取，分离得到菝葜皂甙元。利用ＧＣ－ＭＳ，ＩＲ，并与气相色谱保留值比较进行定性分析，气相色谱外标法定量测定，同时考察了气相色谱定量测定的回收率和水解时间对测定值的问题，实验结果表明，风干芦笋根中菝葜皂甙元的含量在１％以上。     

A New Autoxidation-Michael Addition of a Glycoside Lactone Derivative

C-branched chain glycopyranosiduloses are very efficient chiral building blocks for synthesis of biologically active substances, containing carbocyclic ring systems. Synthesis of such type of structural units has accordingly gained importance in recent years.[1]     

A New Benzoquinone from Antrodia camphorata

Chemistry of Natural Compounds - A new benzoquinone, 2-hydroxy-3-methoxy-5-methyl-p-benzoquinone (1), along with 11 known compounds including three benzoquinones, 2-methoxy-6-methyl-p-benzoquinone...     

电化学氧化苯酚合成对苯醌的研究

在H型阳离子交换膜电解槽中,以H₂SO₄电解质、阳极和阴极铅电极,研究苯酚电解氧化合成对苯醌. 讨论电流密度、电解质浓度、电解液中对苯醌浓度和萃取剂等电解条件对对苯醌收率和电流效率的影响. 经优选工艺条件为：电流密度4 A·dm^-2,H₂SO₄电解质浓度1 mol·L^-1,氯仿萃取剂. 通入3.2 Ah电量,对苯醌收率可达68%,电流效率为24.7%. 而在萃取剂存在下,对苯醌收率可提高至73%,电流效率为26%. 实验结果表明氯仿萃取剂可循环套用.     

Flavonol Glycoside from Psorospermum androsaemifolium

A new flavonol glycoside, 3′‐(4′''‐(3′''',4′'''‐dihydroxyphenoxy)‐2′''‐hydroxyphenoxy)acanthophorin B ( 1a ) together with 3′‐(2′'',4′''‐dihydroxyphenoxy)acanthophorin B ( 1 ), acanthophorin B ( 2 ), vismiaquinone ( 3 ), rheochrysidin ( 3a ), lupeol acetate and fatty acid were isolated from the chloroform extract of the stem bark of Psorospermum androsaemifolium Baker (Clusiaceae). The structure of 1a was determined on the basis of detailed spectroscopic analysis and comparison with the literature. Compounds 1a and 3a showed moderate antimicrobial activity.     

A Flavonol Glycoside from Smilax glabra

A new flavonol glycoside,named neosmitibin was isolated the rhizome of Smilax glabra. Its structure and absolute configuration were elucidated on the basis of spectroscopic studies.     

New Triterpene Glycoside from Thalictrum smithii

CompoundIwasisolatedfromTllallctrltmsmithii.,whitecrystal,mp.211-213t,gaveamolecularformulaofC.,H,,O,,basedonitsnegativeFAB-MS(m/:755M -l,623M xyl-l,491M'-Iofaglycone),IHNMRand13CNMRspectra.datawerelistedinTable1.Figure1.Compound1anditsIIMBCspectralinteractionIntheiHNMR(500MHz.DMSO-d,)of1,theprotondoubletsinteractingwithoneanotherinthemannerofanABsystemareobservedintheupfieldat50.27and0.45(eachIH,d,J=2.9Hi,H-19),indicatingthepresenceofacyclopropanering.Therearealsosixmethyls…     

New Flavonoid Glycoside from Thalictrum przewalskii

Compoundl,whitepowder,gaveamolecularformulaofC,,H.,O,,basedonitsEI-MS(m/z284M ofaglycone),positiveMALDI-TOF-HRMS(M linjz839.2610,cafed.ForC,,H.,O,,,839.2604),IHNMRand13CNMRspectra.TheUV(MeOH)bandsat268,328urnsuggestedaflavonoidskeleton.ItsiR(KBr)spectrumshowedabsorptionat3440(OH),2950(saturatedCH),1735(esterC=O),1650(aAunsaturatedC=O),1615(C=C),1590,1515,1500cm-1(aromaticsystem).FiBurc1.Keyinteractionsof1initsHMBCspectrumInitsiHNMR(500MHz,DMSO-d,),thearomaticproton…     

A New Glycoside from Erigeron Breviscapus

1Er!'geronbreviscapuS(Van)Hand-Mazzisaperennialherb,whichgrowsabundantlyinYunnanandGuangxiprovincesofChina.Manyerigerosideshavebeenfoundpreviouslyinthisplant'-'.WereportheretheisolationandstructuralelucidationofanewconstituenterigesideIIfromthebutanol-solublefractionofE.breviscapus.TheEtOHextractoftheplantwaspartitionedwithpetroleumether,EtOAcandn-BuOH.Then--BuOHfractionwasfurtherfractionatedbysilicagelchromatographyandHPLCtoafford1.l,mp.148--149"C,FAB-MSm/zf436[M] ,475[M K] .El…     

A Diterpene, a Flavonol Glycoside, and a Phytosterol Glycoside from Securidaca longipedunculata and Entada abyssinica

Summary.  The MeOH extract of the stem bark of Entada abyssinica and of the leaves and stem bark of Securidaca longipedunculata yielded a diterpene, a flavonol glycoside, and a phytosterol glycoside. Their structures were established on basis of NMR spectroscopic analysis; the complete ¹³C and ¹H assignment of the compounds was achieved by means of 2D NMR studies. Received October 13, 1999. Accepted November 3, 1999     

A New Dihydroflavone Glycoside from Glycyrrhiza uralensis

A new dihydroflavone glycoside was isolated from the underground parts of Glycyrrhiza uralensis. Its structure was elucidated as 7-hydroxyl-4′-O-]3-D-(6″-O-α-hydroxylpropionyl) glucopyranosyl dihydroflavone by spectral methods.     

A New Triterpenoid Glycoside from Dichotomanthes tristaniaecarpa

Dichotomanthes tristaniaecarp ( Kurz.) belongs to the family Rosaceae. Its root bark is used as Chinese folk medicine for treatment of flu, cough, sore throat and nosebleed. Chemical constituents of this species have not been reported previously. Compound 1 was obtained as colorless needles, mp. 213-215 °C. The molecular formula was determined as C36H58O11 by its negative-ion FAB MS ([M]- at m/z 665) and 13C NMR DEPT spectrum. The analysis of 13C NMR spectrum showed 30 signals for …     

A Novel Monoterpene Glycoside from Swertia mileensis

A novel monoterpene glycoside, mileenside, was isolated from Swertia mileensis by repeated normal and reverse phase silica gel chromatography and its structure was elucidated mainly based on spectral evidence.     

A Novel Pregnane Glycoside from Biondia chinensis

A novel pregnane glycoside, biondianoside E, was isolated from the roots of Biondia chinensis. By the spectroscopic and chemical methods, this structure was elucidated as 3β, 5β,14β, 20S, 21-pentahydroxypregnane 3-O-β-D-glucopyranosyl-(1→4)-β-D-cymaropyranoside.     

A New Furostanol Glycoside from Polygonatum odoratum

A new furostanol component glycosylated only at C-26 was isolated from the rhizomes of Polygonatum odoratum(Mill.)Druce,and its structure was characterized as 22-hydroxy-25(R and S)furost-5-en-12-on-3β,22,26-triol 26-O-β-D-glucopyranoside on the basis of spectroscopic techniques and chemical methods.