Macrophyllols A and B, two unusual novel sesquiterpene and monoterpene dimers from the bark of Inula macrophylla.

[structure: see text] Two novel sesquiterpene and monoterpene dimers, macrophyllols A (1) and B (2), were isolated from the bark of Inula macrophylla. Their structures were determined on the basis of spectral evidence (especially HREIMS and 2D NMR) as well as chemical transformation. The structure of macrophyllol A (1) was confirmed by X-ray analysis. The possible biosynthetic pathways of macrophyllols A (1) and B (2) are discussed.

Phenylbutanoids and stilbene derivatives of Rheum maximowiczii.

The methanol extract of the dried roots of Rheum maximowiczii afforded four phenylbutanoid and two stilbene derivatives. Their structures were established on the basis of chemical and spectroscopic studies.

Terpenoids and gamma-pyrone derivatives from Prangos tschimganica.

The methanol extract of the dried aerial parts of Prangos tschimganica afforded seven monoterpenoids and four gamma-pyrone derivatives. Their structures were established on the basis of chemical and spectroscopic evidence.

A bis-sesquiterpene and sesquiterpenolides from Inula macrophylla.

Macrophyllidimer C, a novel bis-sesquiterpene, in which the two sesquiterpene units are directly connected by a C-C bond, and eight other sesquiterpenolides were obtained from the bark of Inula macrophylla. Seven of these, macrophyllilactones A-G, are new eudesmanolide- and elemanolide-type sesquiterpenes. Their structures were determined on the basis of spectroscopic evidence and chemical reaction.

Sesquiterpenoids from the fruits of Ferula kuhistanica and antibacterial activity of the constituents of F. kuhistanica.

Ethyl acetate extracts of the air-dried fruits of Ferula kuhistanica afforded three daucane esters: kuhistanicaol H, I and J, together with nine other known compounds. Their structures were established on the basis of spectroscopic evidence. Isolated compounds in this paper and previously reported compounds from the roots and stems of F. kuhistanica were tested for antibacterial activity. Some of them were selectively toxic against Gram-positive bacteria, including methicillin-sensitive and methicillin-resistant Staphylococcus aureus (MSSA and MRSA).

Prenylated benzoic acid derivatives from Ferula kuhistanica.

Four new prenylated benzoic acid derivatives, kuhistanols A-D (1-4), along with one known compound, 3-farnesyl-p-hydroxybenzoic acid (5), have been isolated from the roots of the Uzbekistan medicinal plant, Ferula kuhistanica. Their structures were established on the basis of chemical and spectral evidence. Compound 4 showed a significant inhibitory effect on cytokine production in lipopolysaccharide-stimulated human peripheral mononuclear cells.

Sesquiterpene coumarins and related derivatives from Ferula pallida.

Six new compounds-two sesquiterpene coumarins, pallidones A and B (1, 2), and four related derivatives, pallidones C-F (3-6), as well as two known sesquiterpene coumarins, feselol (7) and conferol (8), have been isolated from the EtOAc extracts of the roots of Ferula pallida. All structures of these compounds were determined on the basis of spectral evidence, especially 2D NMR ((1)H-(1)H COSY, HSQC, HMBC, and NOESY) and HRMS. The possible biosynthetic pathway of pallidones C-F (3-6) is discussed.

Sesquiterpene phenylpropanoid and sesquiterpene chromone derivatives from Ferula pallida.

Four novel compounds-two sesquiterpene phenylpropanoid derivatives, pallidones G (1) and H (2), and two sesquiterpene chromone derivatives, pallidones I (3) and J (4)-have been isolated from the roots of Ferula pallida. Their structures were determined on the basis of NMR and HREIMS evidence.

Chemical constituents of Prangos tschiniganica; structure elucidation and absolute configuration of coumarin and furanocoumarin derivatives with anti-HIV activity.

The methanol extract of the dried aerial parts of Prangos tschimganica gave three new coumarin derivatives and 30 known coumarin derivatives. Their structures were established on the basis of chemical and spectroscopic evidence. Absolute configuration of the isolated compounds were determined by using a modified Mosher's method. Some of the isolated compounds showed anti-HIV activity.

Sesquiterpenes and monoterpenes from the bark of Inula macrophylla.

Eleven new sesquiterpenes (1--11) and two thymol derivatives (12, 13), along with 12 known sesquiterpenes and monoterpenes, were isolated from the bark of Inula macrophylla. Their structures were determined on the basis of spectral evidence (especially by HREIMS and 2D NMR) as well as chemical transformations. The structure of macrophyllic acid A (1) was confirmed by X-ray analysis, and the absolute configuration of 1 was determined on the basis of the appropriate chemical conversions and the application of a modified Mosher's method.

Farnesyl hydroxybenzoic acid derivatives from Ferula kuhistanica.

Four new farnesyl hydroxybenzoic acid derivatives, kuhistanols E-H (1-4), were isolated from the roots of the Uzbekistan medicinal plant Ferula kuhistanica. The structures of the new compounds were elucidated based on spectroscopic and chemical evidence.

Phlomisflavosides A and B, new flavonol bisglycosides from Phlomis spinidens.

From the aerial parts of Phlomis spinidens, two new flavonol bisglycosides, phlomisflavosides A (1) and B (2), were isolated together with the known compounds, astragalin, isoquercitrin, lamiridoside, phlomoside A, shanzhiside methyl ester, 8-O-acetylshanzhiside methyl ester, phlorigidoside C, rodioloside (=salidroside), forsythoside B, citroside A and lariciresinol-4'-O-beta-D-glucoside. The structures of the new compounds were elucidated based on spectral and chemical evidence.