Four new compounds from the roots of Uvaria macrophylla

Four new compounds, uvamalols A-C (1-3) and uvarimacrophin A (4), have been isolated from the roots of Uvaria macrophylla. Their structures have been elucidated by spectroscopic methods. The relative configurations of uvamalols A-C have been established by NOE experiments, and the relative stereochemistry of uvarimacrophin A inferred from the diagnostic NMR data by comparison with known model compounds.     

Uvamalols D-G: novel polyoxygenated seco-cyclohexenes from the roots of Uvaria macrophylla

Uvamalols D-F (1 - 4), novel polyoxygenated seco-cyclohexenes, were isolated from the roots of Uvaria macrophylla, and their structures were elucidated by interpretation of spectral data.     

Two new polyoxygenated cyclohexenes from Uvaria kweichowensis

Two new polyoxygenated cyclohexenes, kweichowenols C and D, were isolated from the leaves of Uvaria kweichowensis, and their structures were established on the basis of their spectral data. The two new compounds showed some antitumor activity by the MTT assay.     

Two new compounds from the roots of Swietenia macrophylla

Abstract

Phytochemical investigation on the roots of Swietenia macrophylla yielded one new pharagmalin-type limonoid named 2-dehydroxyl-swietephragmin C (1) and one new xanthone, 1,5-dihydroxy-6-methoxy-6′,6′-dimethyl-2H-pyrano[2′,3′:3,2]xanthone (2), in addition to three known compounds. The structures of the new compounds were unambiguously determined by comprehensive spectroscopic methods (NMR, UV, IR, MS), as well as by comparison with the reported data in the literature. Xanthones were reported from Swietenia genus for the first time.     

New polyoxygenated cyclohexenes from Uvaria calamistrata

Five new polyoxygenated cyclohexenes, named uvacalol A (1), B (2), C (3), D (4) and E (5) were isolated from the roots of Uvaria calamistrata. On the basis of spectral analysis and chemical derivatization, including the preparation of Mosher esters, the structures of compound 1-5 were established as (2R,3S,4R,5S)-2-acetoxyl-5-ethoxyl-1-benzoyloxymethylcyclohex-1(6)-ene-3,4-diol-3-benzoate, (2R,3S,4R,5S)-2-acetoxyl-5-ethoxyl-1-benzoyloxymethylcyclohex-1(6)-ene-3,4-diol-4-benzoate, (2R,3S,4R,5S)-5-ethoxyl-1-benzoyloxymethylcyclohex-1(6)-ene-2,3,4-triol-3-benzoate, (2R,3S,4R,5S)-3-methoxyl-1-benzoyloxymethylcyclohex-1(6)-ene-2,3,5-triol and (2R,3S,4R,5S)-2-acetoxyl-1-benzoyloxymethylcyclohex-1(6)-ene-3,4,5-triol-5-benzoate, respectively.     

Three polyoxygenated cyclohexenes from Uvaria calamistrata

Three new polyoxygenated cyclohexenes, named uvacanols F, G, H (1–3), were isolated from the roots of Uvaria calamistrata (Annonaceae). Their structures were determined to be 2-acetoxyl-5-chlorine-benzoyloxymethylcyclohex-1 (6)-ene-4-ol-3-benzoate (1), benzoyloxy-methylcyclohex-1 (6)-ene-2,3,4-triols-5-benzoate (2), 3-acetoxyl-benzoyloxymethylcyclohex-1 (6)-ene-4,5-diols-2-benzoate (3) by spectroscopic methods and chemical derivatization.     

Four new alkaloids from Polyalthia nemoralis (Annonaceae)

Four new alkaloids, polynemoralines A (1), B (2), C (3), and D (4), were isolated from the branches and leaves of Polyalthia nemoralis A DC. The structures of 1–4 were elucidated mainly on the basis of spectroscopic methods. The structure of 4 was confirmed by X-ray diffraction analysis.     

大花紫玉盘中的多氧取代环己烯衍生物

从大花紫玉盘茎中分离得到5个新的多氧取代环己烯衍生物,根据光谱分析及与已知化合物比较确定了它们的结构,并分别命名为大花紫玉盘酮A（2）、B（3）、C（5）、D（7）及大花紫玉盘醇J（5）。同时,应用CD谱测定了化合物2、5、6、7的绝对构型。     

A new cerebroside from Uvaria tonkinensis var. subglabra

A new cerebroside, subglain A (1), together with five known compounds (2–6) have been isolated from the stems of Uvaria tonkinensis var. subglabra. The structure of 1 has been determined to be 1-O-β-D-glucopyranosyl-(2S,3S,4R,8Z,2′R)-2-[N-(2′-hydroxytetracosanyl)-N-(1″,2″-dihydroxyethyl)-amide]-8-tetradecene-1,3,4-triol by spectroscopic evidence. The known compounds were identified as schisandriside (2), erythritol (3), β-D-glucopyranose (4), kaempferol-3,7-O-α-L-dirhamnoside (5), and (+)-lyoniresinol (6).     

New polyoxygenated cyclohexene and polyoxygenated seco-cyclohexene from Uvaria boniana

A new polyoxygenated cyclohexene bonianol A (1) and another new polyoxygenated seco-cyclohexene bonianol B (2) were isolated from the leaves of Uvaria boniana, and their structures were established on the basis of spectroscopic methods including IR, HR-ESI-MS, 1D, and 2D NMR.     

光叶紫玉盘多氧取代环己烯类成分研究

从番荔枝科紫玉盘属植物光叶紫玉盘(Uvaria boniana Finet)地上茎EtOH提取物中分离出7种新的多氧取代环己烯类化合物,用波谱分析和Mosher酯制备等方法确定了全部化学结构及其绝对构型,分别命名为光叶紫玉盘醇A～G(uvaribonolA～G,1～7)。体外抗肿瘤筛选表明,这些天然化合物均无活性,但部分半合成衍生物活性明显,其中尤以光叶紫玉盘醇B(2)的氧化物(2a)最为显著,抑制KB、Bel₇₄₀₂和A₂₇₈₀细胞的IC50值均小于1μg·ml^-1,抑制HCT-8的IC₅₀则小于0.1μg·ml^-1。     

Mexicanolide-type limonoids from the seeds of Swietenia macrophylla

Three new mexicanolide-type limonoids, 3-O-propionylproceranolide (1), 6-O-acetylswietenin B (2), and 6-deoxyswietemahonin A (3), together with 15 known limonoids, were isolated from the seeds of Swietenia macrophylla (Meliaceae). The structures of those new compounds were established by extensive analysis of MS, 1D, and 2D NMR spectral data.     

Three new C21-steroidal glycosides from the roots of Cynanchum inamoenum

Three new C₂₁-steroidal glycosides presenting an unusual 13,14:14,15-disecopregnane-type skeleton, named inamosides A–C (1–3), together with two known C₂₁-steroidal glycosides, were isolated from the MeOH extract of the roots of Cynanchum inamoeum (Maxim.) Loes (Asclepiadaceae). The aglycone of compounds 1, 2, and 3 has a 2β-hydroxyl, which has not yet been reported in the literature. The structure and relative configuration of the aglycone of compounds 1, 2, and 3 were established by X-ray crystallographic analysis.     

SIRT1 inhibitory compounds from the roots of Codonopsis pilosula

Three new compounds, pilosulinene A (1), pilosulinols A (2), and B (3), along with seven known compounds, were isolated from the roots of Codonopsis pilosula cultivated in Xundian County of Yunnan Province. The structures of new compounds were established by spectroscopic methods. In particular, the presence of an aromatic ring in the structure of 1 makes it intriguing. The inhibitory activity of compounds against SIRT1 was evaluated. The results showed that 8 could inhibit Sirt1 in a dose-dependent manner.     

大叶钩藤茎三萜类成分研究（英文）

从大叶钩藤茎中分离得到19个三萜类成分,包括11个乌苏烷型三萜和8个齐墩果烷型三萜,其化学结构通过波谱学方法鉴定。19个化合物中12个化合物为首次从大叶钩藤中分离得到,6个化合物为首次从钩藤属植物中分离得到。     

Four new alkylamides from the roots of Zanthoxylum nitidum

Phytochemical investigation on the roots of Zanthoxylum nitidum led to the isolation of four new unsaturated alkylamides, zanthoxylumamides A–D. Their structures were established via the detailed spectroscopic analyses.     

瘤果紫玉盘叶中的黄酮类成分

目的研究瘤果紫玉盘(Uvaria kweichowensis)的化学成分,为阐明其活性成分,开发其资源提供科学依据。方法应用多种色谱技术进行分离纯化,根据理化性质和波谱技术进行结构鉴定。结果从瘤果紫玉盘叶中分离得到7个黄酮类化合物,分别鉴定为槲皮素(Ⅰ)、山奈酚(Ⅱ)、大豆苷元(Ⅲ)、黄芩苷(Ⅳ)、山奈酚3O芸香糖苷(Ⅴ)、芦丁(Ⅵ)、山奈酚3OβD吡喃葡萄糖苷(Ⅶ)。结论化合物Ⅰ~Ⅶ均为首次从紫玉盘属植物中分离得到。     

Three new C21-steroidal glycosides from the roots of Cynanchum inamoenum

Three new C₂₁-steroidal glycosides presenting an unusual 13,14:14,15-disecopregnane-type skeleton, named inamosides A-C (1-3), together with two known C₂₁-steroidal glycosides, were isolated from the MeOH extract of the roots of Cynanchum inamoeum (Maxim.) Loes (Asclepiadaceae). The aglycone of compounds 1, 2, and 3 has a 2β-hydroxyl, which has not yet been reported in the literature. The structure and relative configuration of the aglycone of compounds 1, 2, and 3 were established by X-ray crystallographic analysis.     

Two new arylbenzofurans from the roots of Hedysarum multijugum

Two new arylbenzofurans, hedysarimbenzofuran A (1) and hedysarimbenzofuran B (2), were isolated from the roots of Hedysarum multijugum. The structures were determined by spectroscopic methods.     

Four new glucosides from the aerial parts of Mediasia macrophylla

As part of our chemical studies on the medical plants in Uzbekistan aimed at searching for new drug leads, we have examined the aerial parts of Mediasia macrophylla. This has resulted in the isolation of four new glucosides, together with 30 known compounds. The structures of new compounds were elucidated as (1′S)-(4-hydroxyphenyl) ethane-1′,2′-diol 2′-O-β-glucopyranoside (1), 3-(4′-methoxyphenyl)-propanol 1-O-β-glucopyranoside (2), 2-methoxy-3-hydroxy-5-(E)-propenyl-phenol 1-O-β-glucopyranoside (3), 1-O-angeloyl-β-glucopyranose (4), on the basis of spectral analysis.