Two new iridoid glycosides from the whole plant of Rehmania piasezkii.

Two new iridoid glycosides, piasezkiiosides A (1) and B (2), were isolated from aqueous extract of the whole plant of Rehmannia piasezkii. Their structures were established from the spectroscopic data, chemical transformation, and X-ray diffraction analysis. Compound 1 exhibited weak hepatoprotective activity against APAP-induced HepG2 cell damage.

Seven new pentasaccharides from the roots of Rehmannia glutinosa.

Seven new pentasaccharides (1-7), rehmaglupentasaccharides A-G, were isolated from the air-dried roots of Rehmannia glutinosa. Their structures were established from the spectroscopic data obtained and by chemical evidence. The known verbascose (8) and stachyose (9) were also obtained in the current investigation, and the structure of stachyose was unequivocally defined using X-ray diffraction data. Compounds 1-9 were tested for their cytotoxicity against five human tumor cell lines, influence on dopamine receptor activation, and proliferation effects against Lactobacillus reuteri.

Four new iridoid glycosides from the roots of Rehmannia glutinosa.

Four new iridoid glycosides (1-4), rehmaglutosides L-O, were isolated from the air-dried roots of Rehmannia glutinosa. Their structures were established from the spectroscopic data obtained and by chemical evidence. The known mellittoside (5) and ajugol (6) were also obtained in the current investigation, and the structure of mellittoside was unequivocally defined using X-ray diffraction data. Compounds 1-6 were tested for their cytotoxicity against five human tumor cell lines and proliferation effects on Lactobacillus Reuteri.

Three new pyridine alkaloids and one new iridoid analogue from the leaves of Rehmannia glutinosa.

As part of an ongoing project on Rehmannia species, three new pyridine alkaloides (glutinosines A - C), and one new iridoid analogue (rehmaglutin E), were isolated from the leaves of Rehmannia glutinosa. The structures of the new compounds were established by extensive spectroscopic analysis and electronic circular dichroism calculations.

Four ionones and ionone glycosides from the whole plant of Rehmannia piasezkii.

Four new ionones and ionone glycosides (1-4) were isolated from the whole plant of Rehmannia piasezkii Maxim. Their planar structures as well as absolute configuration were confirmed via spectroscopic analysis, ECD calculation, and X-ray crystallography. Compounds 1-4 were tested for their cytotoxicity against five human tumor cell lines and ability to inhibit LPS-activated NO production in the BV2 cell line.

[Chemical constituents from seeds of Hydnocarpus anthelminthica].

The present study investigated the chemical constituents from the dry seeds of Hydnocarpus anthelminthica. The compounds were isolated and purified from the dry seeds of H. anthelminthica by various chromatographic techniques including column chromatography over silica gel and Sephadex LH-20 and reversed-phase HPLC. Their structures were identified by spectroscopic analysis. The in vitro cytotoxic activities were determined by MTT assay. Ten compounds were isolated and identified as 2-(4-hydroxy-3,5-dimethoxyphenyl)-3-(2-hydroxy-5-methoxyphenyl)-3-oxo-1-propanol(1), threo-1,2-bis-(4-hydroxy-3-methoxyphenyl)-propane-1,3-diol(2), erythro-1,2-bis-(4-hydroxy-3-methoxyphenyl)-propane-1,3-diol(3), 2-(4-hydroxy-3-methoxyphenyl)-3-(2-hydroxy-5-methoxyphenyl)-3-oxo-1-propanol(4), 3-hydroxy-2-(4-hydroxy-3-methoxyphenyl)-1-(4-hydroxyphenyl)-propan-1-one(5), chrysoeriol(6), evofolin B(7), apigenin-3'-methoxy-7-O-rutinoside(8), luteolin(9), and vitexin(10). Compound 1 is a new compound. Compounds 4 and 5 were isolated from this genus for the first time. All compounds showed no significant cytotoxic activity.

Five new cyclopentenyl fatty acid derivatives from the seeds of Hydnocarpus anthelminthica.

Five new fatty acids with a terminal 3-oxo-cyclopentene ring, cyclopentenone acids A-E (1-5), were isolated from the ethanol extract of the seeds of Hydnocarpus anthelminthica. The structures of these compounds were elucidated on the basis of their spectroscopic data and chemical evidence. Compounds 1-3 were evaluated for their anti-inflammatory activity based on the inhibition of NO production in microglial BV2 cells, and all of them showed weak anti-inflammatory activities.

Three new erythrina alkaloids from the roots of Erythrina corallodendron.

Three new erythrina alkaloids, eryalkals A (1), B (2), and C (3), were isolated from the roots of Erythrina corallodendron L. Their structures, including their absolute configurations, were elucidated based on analyses of HR-ESI-MS, 1D/2D NMR and single-crystal X-ray diffraction techniques. The isolated erythrina alkaloids were screened for the antioxidant and cytotoxic activities. All the compounds showed no antioxidant activity and cytotoxic activities.

[Chemical compositions from roots of Erythrina corallodendron].

This project is to investigate chemical compositions from the roots of Erythrina corallodendron. Through the methods of silica gel,ODS,Sephadex LH-20 column chromatography and preparative HPLC,15 compounds were isolated from the 95% ethanol extract of the roots of E. corallodendron. Based on spectroscopic techniques,the structures of these compounds were identified as 10,11-dioxoerythraline( 1),erythrinine( 2),erythraline( 3),11-methoxyerythraline( 4),cristanines B( 5),erythratine( 6),erysotrine( 7),medioresinol( 8),( ±)-ficusesquilignan A( 9),( +)-pinoresinol( 10),nicotinic acid( 11),dibutyl phthalate( 12),vanillic acid( 13),3-hydroxy-1-( 4-hydroxy-3-methoxyphenyl)-1-propanone( 14),and syringic acid( 15). Compounds 8-10 are isolated from genus Erythrina for the first time and all compounds are isolated from E. corallodendron for the first time. Furthermore,this paper screened the antioxidant and cytotoxic activities of the compounds using models of liver microsomal oxidation inhibition and MTT.

Five new iridoids from the whole plants of Rehmannia henryi.

Five new iridoids (1-5), jiohenrins A-E, together with sixteen known compounds (6-21), were isolated from the whole plants of Rehmannia henryi. The structures of these compounds were elucidated on the basis of their spectroscopic data.

Rearranged iridal-type triterpenoids from Iris tectorum.

Three new iridal-type triterpenoids (1-3) featuring a rearranged homofarnesylside chain were isolated from the rhizomes of Iris tectorum. Compounds 2 and 3 were found to be a pair of epimers. Their structures were elucidated on the basis of comprehensive spectroscopic analysis. A possible biosynthetic pathway for them was postulated. Moreover, the mixture of compounds 2 and 3 exhibited moderate neuroprotective activity against serum deprivation-induced PC12 cell death.

[Lignans from seed of Hydnocarpus anthelminthica].

This project is to investigate lignans from the seed of Hydnocarpus anthelminthica. Thirteen lignans were isolated from the 95% ethanol extract of the seed of H. anthelminthica, by polyamide resin, Sephadex LH-20, ODS column chromatography and preparative HPLC. Their structures were elucidated as(+)-syringaresinol(1), lirioresinol A(2),(+)-medioresinol(3),(7R,8R,8'R)-4'-guaiacylglyceryl-evofolin B(4), leptolepisol C(5),(-)-(7R,7'R,7″R,8S,8'S,8″S)-4',4″-dihydroxy-3,3',3″,5,5',5″-hexamethoxy-7,9':7',9-diepoxy-4,8″-oxy-8,8'-sesquineolignan-7″,9″-diol(6),(-)-(7R,7'R,7″R,8S,8'S,8″S)-4',4″-dihydroxy-3,3',3″,5,5'-pentamethoxy-7,9':7',9-diepoxy-4,8″-oxy-8,8'ses-quineolignan-7″,9″-diol(7), ceplignan(8), hydnocarpusol(9), isohydnocarpin(10),(-)-hydnocarpin(11), hydnocarpin(12), and hydnocarpin-D(13) by spectroscopic data analysis. Compounds 1-8 were obtained from the genus Hydnocarpus for the first time.

Nine new compounds from the whole plants of Rehmannia henryi.

Eight new iridoids (1-8) and an ionone glucoside (9), together with 31 known compounds (10-40), were isolated from the whole plants of Rehmannia henryi. The structures of these compounds were elucidated on the basis of their spectroscopic data and chemical evidence.

Heliosterpenoids A and B, two Novel Jatrophane-Derived Diterpenoids with a 5/6/4/6 Ring System from Euphorbia helioscopia.

Heliosterpenoids A and B (1 and 2), two unprecedented jatrophane-derived diterpenoid esters with a novel 5/6/4/6-fused tetracyclic ring skeleton, were isolated from the whole plants of Euphorbia helioscopia. The structures of 1 and 2 were elucidated by extensive spectroscopic methods and electronic circular dichroism (ECD) analyses. The plausible biogenetic pathways of 1 and 2 were postulated. 1 and 2 were found to be potent inhibitors of P-glycoprotein (ABCB1) and 1 also exhibited cytotoxicity against MDA-MB-231 cell lines.

Aristolochic acid derivatives from the rhizome of Arisolochia championii.

Four new aristolochic acid derivatives aristchamic A (1), aristchamic B (2), aristochamic C (3a), aristchamic D (3b) and one new aristolactam aristolactam-CV (4), together with 10 known compounds (5-14), were isolated from the rhizomes of Aristolochia championii. Their structures were assigned by detailed analysis of MS and NMR spectroscopic data. All of the isolated compounds were evaluated for their cytotoxic activities against HCT-116, HepG2, BGC-823, NCI-H1650, and A2780 cell. Compound 1 exhibited significant cytotoxic activity against HCT-116, HepG2, BGC-823, and NCI-H1650, with IC50 values of 0.50, 7.37, 2.66, and 0.75µM, respectively.

Apocynin derivatives from Iris tectorum.

Phytochemical investigation of the rhizomes of Iris tectorum resulted in the isolation and characterization of three new apocynin derivatives, apocynin-4-O-ß-D-(6'-O-syringyl)glucopyranoside (1), scrophenoside C-7-ethyl ether (2, 3), together with a new naturally occurring compound but known by synthesis, apocynin-4-O-ß-D-xylopyranoside (4), and five known ones (5-9). Their structures were elucidated on the basis of spectroscopic data interpretation.

Four new compounds from the rhizome of Aristolochia championii.

Three new flavonoid glycosides (1-3) and one new aristololactam N-glycoside (4) were isolated from the rhizome of Aristolochia championii. The structures of compounds 1-4 were elucidated on the basis of their spectroscopic data and chemical evidence (UV, IR, HR-ESI-MS, 1D and 2D NMR). Their structures were determined as 8-(5-formyl-2-furanmethyl)-isorhamentin 3-O-robinobioside (1), 8-(5-methyl-2-furanoyl)-isorhamentin 3-O-robinobioside (2), 8-formylisorhamentin 3-O-robinobioside (3), and N-ß-D-glucopyranosylaristololactam V (4), respectively.

Polycycloiridals with a Cyclopentane Ring from Iris tectorum.

Six new iridal-type triterpenoids containing an unprecedented cyclopentane ring, polycycloiridals E-J (1-6), were isolated from a large-scale re-extraction of Iris tectorum. A possible biosynthesis pathway is postulated. The known spirioiridotectal D (7) was also obtained in the current investigation, and its structure was unequivocally defined using X-ray diffraction data. Compound 7 suppressed LPS-activated NO production in the BV2 cell line with an IC50 value of 0.54 µM.

Aromatic glycosides from the whole plants of Iris japonica.

Phytochemical investigation on the whole plants of Iris japonica led to the isolation of four new aromatic glycosides. Their structures including the absolute configurations were determined by spectroscopic and chemical methods as (-)-4-hydroxy-3-methoxy acetophenone 4-O-ß-d-{6-O-[4-O-(7R,8S)-(4-hydroxy-3-methoxyphenylglycerol-8-yl)-3-methoxybenzoyl]}-glucopyranoside (1), (-)-4-hydroxy-3-methoxy acetophenone 4-O-ß-d-{6-O-[4-O-(7S,8R)-(4-hydroxy-3-methoxyphenylglycerol-8-yl)-3-methoxybenzoyl]}-glucopyranoside (2), (-)-4-hydroxy-3-methoxy acetophenone 4-O-ß-d-{6-O-[4-O-(7R,8R)-(4-hydroxy-3-methoxyphenylglycerol-8-yl)-3-methoxybenzoyl]}-glucopyranoside (3), (-)-4-hydroxy-3-methoxy acetophenone 4-O-ß-d-{6-O-[4-O-(7S,8S)-(4-hydroxy-3-methoxyphenylglycerol-8-yl)-3-methoxybenzoyl]}-glucopyranoside (4), respectively.

Nine new compounds from the whole plants of Rehmannia chingii.

Nine new compounds, together with 16 known analogs, were isolated from the whole plants of Rehmannia chingii. The structures of compounds 1-9 were elucidated on the basis of their spectroscopic data and chemical evidence. In addition, the new compounds were tested for their hepatoprotective activities against APAP-induced HepG2 cell damage and their ability to inhibit LPS-induced nitric oxide production in the murine microglia BV2 cell line. Compounds 2 and 5 exhibited pronounced hepatoprotective activities against APAP-induced HepG2 cell damage at a concentration of 10 µM, and compounds 4 and 9 showed moderate inhibitory activity against microglial inflammation factor with IC50 values of 3.51 and 7.11 µM, respectively.