毛叶香茶菜抗癌成分的研究——Ⅰ.毛叶香茶菜素A和B的结构

自毛叶香茶菜Rabdosia japonica(Burm.f)Hara的干叶中分离出四个二萜化合物,其中两个是新的二萜,命名为毛叶香茶菜素A和B。通过光谱分析和化学反应转变成已知化合物epinodosin 6和isodonal 8确定了毛叶香茶菜素A和B的结构分别为3和7。初步的抗癌试验表明,3和7都具有明显细胞毒作用。其它两个二萜成分证明为enmenol 4和epinodosinol 5。     

川藏香茶菜丁素和己素的结构确定

从川藏香茶菜中分离得到2个新化合物,经光谱解析和化学转换反应,确定川藏香茶菜丁素为3α,11β,13α-trihydroxy-entkaur-16-en-15-one(1),川藏香茶菜己素为11β,13α,15α-trihydroxy-entkaur-16-en-3α-β-D-glucoside(2)。     

九种香茶菜属药用植物的形态组织学研究

目的:鉴别四川9种药用香茶菜,确保用药的安全有效.方法:采用形态组织学方法,比较观察了碎米桠、线纹香茶菜、狭基线纹香茶菜、毛萼香茶菜、瘿花香茶菜、细锥香茶菜、黄花香茶菜、显脉香茶菜、腺花香茶菜等的药材性状、茎和叶横切面、叶表面与药材粉末特征.结果:9种药用香茶菜的药材性状和显微特征不同,提供了特征图表和鉴别检索表.结论:提供了相关药用香茶菜品种真伪鉴别的方法.     

冬凌草的化学成分研究

目的:研究香茶菜属植物冬凌草的化学成分。方法:采用硅胶、MCI GEL-CHP 20P、Sephadex LH-20柱和重结晶技术对冬凌草的化学成分进行分离纯化,根据理化性质和波谱数据分析鉴定化合物的结构。结果:从冬凌草中分离得到8个化合物,分别鉴定为24ζ-甲基-5α-羊毛甾烷-25-酮(1)、Maoyecrystal F(2)、瘿花香茶菜甲素(3)、β-谷甾醇(4)、胡萝卜苷(5)、二十七酸(6)、冬凌草甲素(7)、冬凌草乙素(8)。结论:化合物1为首次从香茶菜属植物分离得到,化合物3和化合物6为首次从冬凌草中分离得到;本研究为冬凌草质量评价奠定了一定基础。     

长叶香茶菜化学成分的研究

从长叶香茶菜Rabdoisa stracheyi(Benth ex Hook.f)Hara的地上部分分离得到三种结晶性成分。其中两种为已知化合物6,7-dehydroroyleanone和β-谷甾醇,另一种为新的二萜醌类化合物。通过理化常数和光谱的分析以及衍生物的制备,测定其结构为16-acetoxy-7α-methoxyroyleanone(Ⅰ)。命名为长叶香茶菜甲素。     

大叶香茶菜抗肿瘤成分大叶庚的研究(Ⅱ)

鉴定了从大叶香茶菜Rabdosia macrophylla中分得的另外四种成分。三种为已知成分乌苏酸,香茶菜甲素(AmethystoidinA)及Enmenol。另一大叶庚为新的B-seco-ent-kaurene二萜,命名为RabdophyllinG,能延长荷艾氏腹永癌小鼠的生命并能抑制体外肝癌细胞的生长。     

大叶香茶菜辛素的结构

从大叶香茶菜Rabdosia macrophylla(Migo)C.W.Wu et H.W.Li干叶中提取、分离得十五种成分,其中数种为具有抗肿瘤或细胞毒活性的二萜。本文报道另一种新二萜成分大叶香茶菜辛素(rabdophyllin H)的结构,并由X线单晶衍射方法证实。大叶香茶菜辛素对QGY-7703肝癌细胞具有抑制作用。     

香茶菜甲素、大叶香茶菜丙及其衍生物的抗菌和细胞毒作用

通过对香茶菜属植物的两种二萜成分——香茶菜甲素、大叶香茶菜丙进行结构改造,观察它们的生物活性。结果表明,香茶菜甲素酰化物(Ⅱ)能显著提高抗菌作用,比原化合物提高2～3倍;大叶香茶菜丙水解物(Ⅴ)能显著提高细胞毒活性,比原化合物提高2.3倍。     

大萼香茶菜新二萜成分:大萼香茶菜甲素和乙素的结构

从大萼香茶菜Rabdosia macrocalyx(Dunn)Hara的干叶中得到三种成分,除乌苏酸外,其它两种为新二萜,分别命名为大萼香茶菜甲素(Macrocalin A)及乙素(Maerocalin B)。甲素及乙素对体外培养的Hela细胞有抑制作用,4μg/ml抑制率80%。用光谱法配合衍生物制备测定了它们的结构。     

囊花香茶菜二萜成分的研究

目的研究囊花香茶菜的二萜成分。方法应用硅胶反复柱色谱方法进行化学成分分离,并利用各种光谱技术鉴定分离所得的化学成分。结果从囊花香茶菜干叶的90%乙醇提取物中分离得到3个二萜类化合物,经鉴定为trichorabdalB(1),guidongnin(2),angustifolin(3)。结论均系首次从该植物中分离得到。     

Two new cytotoxic ent-clerodane diterpenoids from Scutellaria barbata

Two new ent-clerodane diterpenoids have been isolated from Scutellaria barbata, and their structures were established by detailed spectroscopic analyses as (13R)-6α,7β-dihydroxy-8β,13-epoxy-11β-nicotinyloxy-ent-clerodan-3-en-15,16-olide (scutelinquanine D, 1) and (11E)-6α-acetoxy-7β,8β-dihydroxy-ent-clerodan-3,11,13-trien-15,16-olide (6-acetoxybarbatin C, 2). In vitro, the isolated two new compounds showed significant cytotoxic activities against three human cancer cell lines (HONE-1 nasopharyngeal, KB oral epidermoid carcinoma, and HT29 colorectal carcinoma cells), and gave IC₅₀ values in the range of 2.5–6.6 μM.     

Chemical constituents of Isodon nervosus and their cytotoxicity

Two new ent-kaurane diterpenoids, 6,20,15α-trihydroxy-6,7-seco-1α,7-olide-ent-kaur-16-ene (1) and 7β,12α-dihydroxy-6β,15β-diacetoxy-7α,20-epoxy-ent-kaur-2,16-dien-1-one (2), together with the six known compounds, were isolated from the aerial part of Isodon nervosus. The structures of the new compounds were determined by spectral methods (1D, 2D NMR, and MS). Six compounds were assayed for their cytotoxicity against HL60, SMMC-7721, and HeLa human cell lines. Compounds 5, 7, and 8 showed significant cytotoxicity.     

Two new casbane diterpenoids from the roots of Euphorbia pekinensis

From the roots of Euphorbia pekinensis, two new casbane diterpenoids, named pekinenins A (1) and B (2), were isolated. Their structures were elucidated as 18-hydroxy-1βH,2αH-casba-3E,7E,11E-trien-5-one (1), 5α-methoxy-1βH,2αH-casba-3Z,7E,11E-trien-18-oic acid (2) by a combination of 1D and 2D NMR spectroscopy and mass spectrometry. In the cytotoxicity assay of the two new compounds against Hela, MCF-7, and C6 human cancer cell lines, compound 1 showed moderate cytotoxic activity against two human cancer cell lines, Hela and C6, with IC₅₀ values of 42.97 and 50.00 μM, respectively.     

虫牙药的化学成分研究

从广西产的虫牙药Isodon ternifolius (D.Don) Kudo的乙酸乙酯提取物中分离到9个单体成分,经鉴定其中两个为新的二萜化合物,命名为牛尾草甲素、乙素(isodoternifolinA,B),光谱数据分析和化学反应证明,甲素的结构为6β,11α,15β-triacetoxy-7β-hydroxy-7α,20-epoxy-entkaur-16-ene,乙素的结构为11αacetoxy-6β,7β.15β-trihydroxy-7α,20-epoxy-entkaur-16-ene。其它成分分别鉴定为β-谷甾醇(β-sitosterol),乌苏酸(ursolicacid),齐墩果酸(oleanolicacid),胡萝β甙(β-sitosterol-β-D-glucopyranoside),6-甲基-三十二烷烃(6-methyldotriacontane),细叶香茶菜甲素(sodoponin)和细叶香茶菜乙素(ternifolin),其中6-甲基-三十二烷烃是首次从香茶菜属植物中分得。     

Two new diterpenoids from coleus forskohlii

Two new diterpenoids, forskolins I and J, have been isolated in our further investigation on Coleus forskohlii (Willd.) Briq. collected in Yunnan Province. Their structures have been determined as 1α,6β-diacetoxy-7β,9α-dihydroxy-8,13-epoxylabd-14-en-11-one (1) and 1α,9α-dihydroxy-6β,7β-diacetoxy-8,13-epoxylabd-14-en-11-one (2) by spectral methods (including 1D and 2D NMR techniques).     

Three new diterpenoids from Coleus forskohlii Briq

Three new diterpenoids, forskolin G(2), forskolin H(3), forskolin I(4), were isolated from the whole plant of the Coleus forskohlii Briq., and their structures were elucidated as 1α,6β-diacetoxy-8,13-epoxylabd-14-en-11-one, 1α-hydroxy-6β,7β-diacetoxy-8,13-epoxylabd-14-en-11-one, and 1α,9α-dihydroxy-6β,7α-diacetoxy-8,13-epoxylabd-14-en-11-one on the basis of spectral data.     

Cytotoxic diterpenoids from Pteris ensiformis

Phytochemistry investigation on Pteris ensiformis led to the isolation of a new ent-kaurane diterpenoid, ent-kaurane-6β,16α-diol-3-one (1), along with five known diterpenoids (2–6) and three known sesquiterpenes (7–9). Their structures were established by means of spectroscopic methods. The ethanol extract and the isolated compounds (1–9) were evaluated for their antitumor activity against three cancer cell lines.     

Anti-neuroinflammatory diterpenoids from the endangered conifer Podocarpus imbricatus

Ten diterpenoids including three new abietanes (1–3) were isolated from the twigs and needles of Podocarpus imbricatus, an endangered conifer growing in a Cantonese garden. The new structures were established by means of spectroscopic methods. Among the isolates, 3β-hydroxy-abieta-8,11,13-trien-7-one (5), decandrin G (6), and 7,15-pimaradien-18-oic acid (8) showed significant anti-neuroinflammatory activities by inhibiting the overproduction of nitric oxide (NO) in lipopolysaccharide (LPS)-stimulated murine BV-2 microglial cells, with IC₅₀ values of 3.7, 11.1, and 4.5 μM, respectively.     

Diterpenoids from the freshwater green algae Rhizoclonium hieroglyphicum with antibacterial activity

Three new isopimarane diterpenes 7β-hydroxy-19α-methylmalonyloxy-isopimara-8(14),15-diene (1), 7β-hydroxy-14-oxo-isopimara-8(9),15-dien-19oic acid (2), and 7β-hydroxy-14-oxo-19α-methylmalonyloxy-isopimara-9(11),15-diene (3) in addition to the known compounds isopimaric acid (4), 7oxo-13-epi-pimara-14,15-dien-18oic acid (5), 7oxo-13-epi-pimara-8,15-dien-18oic acid (6), and 6β-hydroxyisopimaric acid (7) were isolated from the hexane extract of Rhizoclonium hieroglyphicum. The structures of compounds 1–7 were established by 1D and 2D NMR techniques. The isolated diterpenoids were screened for antimicrobial activity against gram-positive and gram-negative bacteria and yeast strains.     

Terpenoids from Euphorbia pekinensis

Abstract

Euphorpekone A (1) and euphorpekone B (2), two new diterpenoids, 3β-hydroxy-25-methyloxylanosta-8,23-diene, a new triterpenoid (3), together with a known triterpenoid, 3β,25-dihydroxylanosta-8,23-diene (4), were isolated from Euphorbia pekinensis Rupr. Their structures were elucidated on the basis of UV, IR, 1D (¹H, ¹³C, NOE) and 2D (¹H–¹H COSY, HSQC, HMBC) NMR, HR-ESI-MS, X-ray diffraction analysis, and CD method.