Simaba orinocensis,an earlier name for Simaba multiflora (Simaroubaceae)

Thomas, Wm. Wayt (New York Botanical Garden, Bronz, NY 10458-9980). Simaba orinocensis, an earlier name for Simaba multiflora (Simaroubaceae). Brittonia 37: 190–191. 1985. Simaba orinocensis has been maintained as a species separate from S. multiflora because Kunth’s illustration showed the flowers to be very different from those of S. multiflora. Examination of the holotype reveals that its flowers do not resemble those illustrated by Kunth but are very similar to those of S. multiflora. Therefore, the two names are considered taxonomic synonyms with S. orinocensis having priority. A complete synonymy is given.     

Canthinones from Simaba cuspidata

Two new alkaloids, 8-methoxycanthin-6-one and 3-methoxycanthin-2,6-dione, were isolated from the EtOH extract of the bark of Simaba cuspidata Spruce ex Engl. Elucidation of the structure of the latter compound included ¹³C NMR spectral comparison with 2-methoxypyridine-N-oxide and N-methoxy-2-pyridone.     

Triterpenes from Maytenus horrida

The new triterpene 1β,3β,11α-trihydroxyolean-12-ene and the already known compounds, lupeol, germanicol, 3β-hydroxy-glutin-5-ene, β-amyrin, 3β-hydroxyolean-9(11),12-diene, 3-oxo-olean-9(11),12-diene, 3β,11α-dihydroxyolean-18-ene,3β,11α-dihydroxyolean-12-ene, 3β,29-dihydroxy-glutin-5-ene and dulcitol, were isolated from the root bark of Maytenus horrida.     

Triterpenes from Euonymus revolutus

Fourteen pentacyclic triterpenes, which included ten D:A-friedooleananes, three lup-20(29)-enes and 2α,3α-dihydroxy-olean-12-en-28-oic acid, were isolated from the stem bark extract of Euonymus revolutus.     

Triterpenes from Gymnosporia emarginata

Triterpene quinone-methides, lupenone, β-amyrin, dulcitol, and sitosterol have been isolated from the timber, root and leaf extracts of Gymnosporia emarginata. Their chemotaxonomic significance is discussed.     

Triterpenes from Mucuna birdwoodiana.

Methanolic extracts of the stalks of Mucuna birdwoodiana on acid hydrolysis and subsequent methylation with diazomethane provided four triterpene sapogenols. On the other hand, investigation of glycosides after methylation of the same extract led to the isolation of four triterpene glycosides. On the basis of chemical and spectral evidence, their structures were characterized as methyl asiatate, methyl maslinate, two new sapogenols, methyl 1 beta,2 alpha,3 beta,23-tetrahydroxyolean-12-en 28-oate (mucunagenin a), its urs-12-en isomer (mucunagenin b), 3-O-(6-O-methyl-beta-D-glucuronopyranosyl) methyl asiatate 3-O-[alpha-L-arabinopyranosyl(1----2)]-6-O-methyl-beta-D-glucur onopyranosyl methyl maslinate, 3-O-[alpha-L-arabinopyranosyl(1----2)]-6-O-methyl-beta-D-glucur onopyranosyl methyl asiatate and 3-O-(6-O-methyl-beta-D-glucuronopyranosyl) asiatic acid 28-O-beta-D-glucopyranoside.     

Triterpenes from Douglas fir sapwood

The saponified ether-soluble extractives of Douglas fir sapwood contained (24R)- 4α,14α,24-trimethyl-9β,19-cyclo-5α-cholestan-3β-ol(24R-cyclocucalanol),a new natural product; 4α,14α-dimethyl-9β,19-cyclo-24-methylene-5α-cholestan-3β- ol (cycloeucalenol); and (24R)-4α,24-dimethyl-5α-cholest-7-en-3β-ol (24R- methyllophenol); this is the first time they have been reported from Douglas fir.     

Triterpenes from Periandra dulcis roots

Three oleanane triterpenes were isolated from the roots of Periandra dulcis,and identified as 3β-hydroxy-25-al-olean-18-en-30-oic acid (periandric acid I), 3β-hydroxy-25-al-olean-12-en-30-oic acid (periandric acid II) and 3-oxo-25-hydroxy-olean-12-en-30-oic acid. The former two compounds (periandric acids I and II) were identical with the aglycones obtained by hydrolysis of periandrin I and II, respectively and the latter one was a new triterpene.     

桐花树五环三萜化学成分的研究

从桐花树树皮的乙醇提取物的乙酸乙酯部分分离到3个化合物,利用波谱技术分别鉴定为protoprimulagenin(1),embelinone(2)和aegicerin(3),其中化合物1和2是首次从该植物中分离到。     

Triterpenes from periandra dulcis roots

Two new triterpenes from the root of Periandra dulcis were found to be 3,25-dioxoolean-12(13)-en-30-oic acid and 3,25-dioxoolean-18(19)-en-30-oic acid.     

Leishmanicidal Triterpenes from Lantana camara

Two new natural triterpenes, lantaninilic acid and lantoic acid, along with the known triterpenes lantadene A, and oleanolic, ursolic, betulinic, lantanolic, and camaric acid, were obtained from the aerial parts of Lantana camara through bioassay‐guided isolation, monitoring the in vitro antileishmanial activity against promastigotes of Leishmania major. Oleanolic acid ( 3 ), ursolic acid ( 4 ), lantadene A ( 5 ), and lantanilic acid ( 7 ) showed significant leishmanicidal activities with IC₅₀ values of 53.0, 12.4, 20.4, and 21.3 μM , respectively. The IC₅₀ value of ursolic acid ( 4 ; 12.4 μM ) was found to be comparable with that of the standard drugs, pentamidine (IC₅₀ 15.0 μM ) and amphotericin B (IC₅₀ 0.31 μM ). The in vitro activities of L. camara and its constituents against promastigotes of Leishmania major are reported here for the first time.     

A new coumarin from Perezia multiflora

A new highly oxidized coumarin was isolated from the roots of Perezia multiflora. Its structure was elucidated as 3,4,8-trimethoxy-6-hydroxy-5-formyl-2$\text{H}$-1-benzopyran-2-one.     

Oligomeric hydrolysable tannins from Tibouchina multiflora

Two hydrolysable tannins, nobotanin O and nobotanin P, were isolated from the leaf extract of Tibouchina multiflora (Melastomataceae) and their dimeric and tetrameric structures elucidated on the basis of spectral data and chemical correlations with nobotanin B and K, respectively. Thirteen known hydrolysable tannins including nobotanins A, B, C and J, which are oligomers characteristic of the Melastomataceae, were also isolated.     

紫菀中三萜及甾体化合物的研究

从紫菀(Aster tataricusL.f.)的根及根茎中分离得到11个化合物,经IR、NMR、MS、X-ray单晶衍射等波谱方法分别鉴定为紫菀酮(shionone)(1)、木栓酮(friedelin)(2)、表木栓醇(epi-friedelanol)(3)、蒲公英萜醇(taraxerol)(4)、α-菠甾醇(-αspinasterol)(5)、二十二碳酸(decosanoic acid)(6)、豆甾醇(stigmasterol)(7)、β-谷甾醇(-βsitosterol)(8)、α-菠甾醇--βD-葡萄糖苷(-αspinasterol--βD-glucoside)(9)、豆甾醇--βD-葡萄糖苷(stigmasterol--βD-glucoside)(10)、胡萝卜苷(daucosterol)(11)。化合物6为首次从该属植物中获得,化合物5,9,10为首次从该植物中分得。活性实验研究结果表明紫菀酮(1),表木栓醇(3)可显著抑制氨水所致小鼠咳嗽。     

无柄新乌檀中的三萜

采用活性跟踪的方法对无柄新乌檀(Neonauclea sessilifolia (Roxb．)Merr．)枝干的乙醇提取物进行结核杆菌活性检测。利用硅胶柱层析、Sephadex-LH20和反相硅胶RPl8柱层析,从具有活性的乙酸乙酯部分分得9个化合物,利用一维、二维核磁共振技术(HMQC,HMBC)并结合质谱与红外光谱,将它们鉴定为3β,15α,21β,23-tetrahydroxy-12-oleanen-28-oic acid(1)、3β,6α,21β,23-tetrahydroxy-12-oleanen-28-oic acid(2)、单皮酚(3)、3,4-二羟基苯甲酸(4)、东茛菪内酯(5)、葸醌大黄酚(6)、5,7-二羟基-2-甲基吡喃酮(7)、β-谷甾醇(8)和^5.22 △-豆甾醇-β-D-葡萄糖苷(9)。其中化合物1和2是两个新化合物。体外抗结核杆菌试验表明,化合物6对结核杆菌(Mycobacterium tuberculosis(Zopf)Lehmannet Neumann)具有一定的抑制效果,用量在25μg时出现抑菌圈：化合物2与4具有微弱的抑制活性。     

Triterpenes from Ferula linkii

Two new natural triterpenes, 3β-acetoxyolean-9,12-diene and 3β-acetoxy-6β-hydroxyolean-9,12-diene, were isolated from Ferula linkii.     

无柄新乌檀中的三萜

Two new triterpenoids, 3β, 15α, 21β, 23-tetrahydroxy-12-oleanen-28-oic acid (1), 3β, 6α, 21β, 23-tetrahydroxy-12-oleanen-28-oic acid (2), together with seven known compounds, viz., paeonol (3), 3, 4-dihydroxybenzoic acid (4), scosoletin (5), anthraquinones chrysophanol (6), 4H-1-benzopyran-4-one, 5, 7-dihydroxy-2-methyl (7), β-sitosterol (8) and stigmasterol glucoside (9) were isolated by the chromatography of the silica gel, RP-18 and Sephadex-LH 20 from the EtOAc extract of Neonauclea sessilifolia (Roxb.) Merr. ( Rubiaceae ). Their structures were elucidated based on spectral analysis including 1D-, 2D-NMR (HMQC, HMBC), IR and EIMS. Among them, compound 6 was shown to possess inhibitory activity on the growth of Mycobacterium tuberculosis (Zopf) Lehmann et Neumann with a minimum inhibitory amount of 25 礸, compounds 2 and 4 also showed weak inhibitory activities on the growteof M. tuberculosis.