3-methoxy-4,6-dihydroxymorphinandien-7-one,an alkaloid from Croton bonplandianum

A new alkaloid, 3-methoxy-4,6-dihydroxymorphinandien-7-one, and norsinoacutine have been isolated from extracts of Croton bonplandianum.     

Canthin-6-one,undulatone and two quassinoids from Hannoa klaineana roots

Canthin-6-one, scopoletin, undulatone and two new quassinoids, 15-desacetylundulatone and 6α-tigloyloxyglaucarubol were isolated from Hannoa klaineana roots; quassinoids were obtained in high yields from this plant material.     

Annonelliptine,an alkaloid from Annona elliptica

Annonelliptine has been isolated from Annona elliptica and its structure has been identified as (R)-7-hydroxy-1-(4′-hydroxybenzyl)-5,6-dimethoxy-N-methyl-1,2,3,4-tetrahydroisoquinoline.     

5-Methoxy-1-oxo-tetrahydro-β-carboline,an alkaloid from Alstonia venenata

A new oxo-tetrahydro-β-carboline alkaloid has been isolated from the root bark of Alstonia venenata. It was identified as 5-methoxy-1-oxo-tetrahydro-β-carboline.     

Glycozolidol,an antibacterial carbazole alkaloid from Glycosmis pentaphylla

Glycozolidol, a new carbazole alkaloid, has been isolated from the roots of Glycosmis pentaphylla. Its structure has been established as 6-hydroxy-2-methoxy-3-methylcarbazole on the basis of physical and chemical evidence. The compound has been found to be active at some Gram-positive and Gram-negative bacteria.     

(+)-Epimaritidine,an alkaloid from Zephyranthes rosea

The isolation and determination, by spectroscopic analyses and chemical correlation, of the structure and stereochemistry of (+)-epimaritidine, a new alkaloid from Zephyranthes rosea, is reported. A facile transformation of maritidine to (+)-epimaritidine is described and the mechanism is appraised in the light of the thermodynamic stability of the latter epimer. (+)-Epimaritidine comprises a missing link in the C-3 epimeric pairs of 5,10b-ethanophenanthridine alkaloids of the vittatine-haemanthamine type.     

Cadabicine,an alkaloid from Cadaba farinosa

A new spermidine alkaloid, cadabicine, has been isolated from Cadaba farinosa. Its structure was determined by X-ray crystallographic and spectral methods.     

臭椿生物碱canthin-6-one对小鼠镇静催眠作用的研究

摘要 目的：研究臭椿生物碱canthin-6-one对小鼠的镇静催眠作用。方法：选昆明小鼠随机分为空白组、地西泮阳性药物组、canthin-6-one低、中、高给药组（5、10、20 mg?kg^-1），采用阈上剂量和阈下剂量戊巴比妥钠诱导小鼠睡眠，记录入睡小鼠比例、睡眠潜伏期和睡眠持续时间。此外，酶联免疫法测定小鼠脑组织中5-HT、NE、DA和GABA含量。结果：中、高剂量canthin-6-one可使小鼠的站立次数和自主活动次数均明显减少（P＜0.05），可使阈上剂量戊巴比妥钠诱导的小鼠的睡眠潜伏期缩短（P＜0.05）；各剂量组可使阈下剂量戊巴比妥钠诱导的小鼠入睡率提高（P＜0.05）。此外，中、高剂量canthin-6-one也可降低小鼠脑组织中5-HT和NE含量，增加GABA含量（P＜0.05），对DA的含量有影响，但无统计学意义（P＞0.05）。结论：Canthin-6-one有明显的协同戊巴比妥钠改善睡眠作用，其作用与相关神经递质（5-HT、NE、GABA）具有密切关系。     

Scholaricine,an alkaloid from alstonia scholaris

A new alkaloid, scholaricine, has been isolated to which structure 2 (demethylscholarine) has been assigned.     

Pentouregine,an aporphine alkaloid with a methyleneoxy bridge from Guatteria ouregou

Pentouregine, isolated from the leaves of Guatteria ouregou, is the first aporphine alkaloid with a 1, 11-methyleneoxy bridge found in an Annonaceae. Its structure has been elucidated by means of spectral analysis.     

5-Methoxy-2,2,8-trimethyl-10-senecioyl-2H,6H-benzo(1,2-b; 5,4-b')dipyran-6-one from Spathelia wrightii

From leaflets of Spathelia wrightii a new pyranochromone has been isolated, the spectroscopic properties of which are in accordance with the structure 5-methoxy-2,2,8-trimethyl-10-senecioyl-2H,6H-benzo(1,2-b, 5,4-b')dipyran-6-one (1).     

Polyavolinamide,an indolosesquiterpene alkaloid from Polyathia suaveolens

A new indolosesquiterpene alkaloid, polyavolinamide, has been identified in the stem of Polyathia suaveolens accompanied by the three previously isolated indolosesquiterpene alkaloids, polyavolensin, polyavolensinol, polyavolensinone, as well as an unidentified triterpene and an aporhine alkaloids. Polyavolinamide was also the major component of the root bark. Its structure was assigned on the basis of ¹¹H and ¹³C NMR, and mass spectrometry.     

Sativanine-g,a cyclopeptide alkaloid from Zizyphus sativa

In addition to the already described peptide alkaloids from the bark of Zizyphus sativa, a new compound of this class, sativanine-G, has been isolated and its structure elucidated. This alkaloid contains a 13-membered ring system and belongs to the nummularine-C class.     

A berbine alkaloid,lienkonine from Corydalis ochotensis

Lienkonine, a further alkaloid from Corydalis ochotensis, has been isolated and elucidated as (?)-2,3,10-trimethoxy-8α-methyl-13aαH-berbine-9-ol by the spectral data and chemical properties.     

An alkaloid from Haplophyllum tuberculatum

A new alkaloid (+)-tuberine was isolated from Haplophyllum tuberculatum. Physicochemical and spectral evidence established its structure and stereochemistry as N- benzoyl-4′-[(2″S,3″S,6″S)-(+)-7″-acetoxy-2″-hydroxy-3″,7″-dimethyl-3″,6″-epoxyoctyloxy]phenethylamine.