From the dried leaves of Alangium chinense, five novel phenolic glycosides, 6'-O-galloylsalicin (1); 4',6'-di-O-galloylsalicin (2); 4',6'-O-(S)-hexahydroxydiphenoylsalicin (3); 4', 6'-O-(R)-hexahydroxydiphenoylsalicin (4); and pyrocatechol 1-O-beta-D-xylopyranosyl(1-->6)-beta-D-glucopyranoside (5) were isolated. The structures of these new compounds were determined by spectroscopic methods.

Five Phenolic Glycosides from Alangium chinense.

A new phenolic acylglucoside,2-methoxy-1,4-biphenol-1-O-[6-O-(3-methoxy-4-hydroxybenzoyl)]-β-D-glucopyranoside(1),together with 8 known compounds,3',5'-di-C-β-D-glucopyranosylphloretin(2),rutin(3),quercetin-3-O-β-D-glucopyranoside(4),pyrogallic acid(5),catechol(6),p-hydroxybenzoic acid(7),protocatechuic acid(8)and vanillic acid(9),was isolated from the methanol extract of the fruits of Amomum tsao-ko.Their structures were determined by detailed spectroscopic analysis,including 1D,2D NMR and MS techniques.The known compounds 2,3,5 and 7-9 were isolated from the titled plant for the first time.

Phenolic Constituents from the Fruits of Amomum tsao-ko(Zingiberaceae)

Objective To study the chemical constituents of Pseudolysimachion linariifolium subsp. dilatatum( Nakai Kitagawa) D. Y.Hong. Methods The compounds were isolated by silica gel column and sephadex LH-20 column chromatography,and identified by analysis of their spectra data. Results Four compounds were obtained and identified as hentriacontane,α-tocopherol,β-sitosterol,linoleic acid. Conclusions All the compounds are isolated from this plant for the first time.

Chemical constituents study of Pseudolysimachion linariifolium subsp

Seven diastereomeric aucubigenin derivatives from Pseudolysimachion linariifolium subsp. dilatatum

Barrelier’s Speedwell or Veronica barrelieri Schott ex Roem. et Schult. (syn. Pseudolysimachion barrelieri (Schott ex Roem. et Schult.) Holub (family Plantaginaceae) grows on dry grasslands and rocky slopes in southeastern Europe. Because of its attractive blue flowers arranged in dense inflorescences up to 30 cm long, this plant has great potential for horticulture, especially in dry climates. As part of studies on biologically active compounds in this species, free VCs (Volatile Compounds) were analyzed by GC-MS (Gas Chromatography with Mass Spectrometry) and micromorphological features were studied by SEM (Scanning Electron Microscopy). Free VCs from aboveground plant parts collected during flowering were characterized by a considerably high content of oxygenated diterpene phytol, followed by hexadecanoic acids, pentacosane, and caryophyllene oxide. These compounds are most abundant in the composition of VCs isolates of V. barrelieri from all five Croatian localities studied. Non-glandular and two subtypes of capitate glandular trichomes were detected on the stems, leaves and calyx of V. barrelieri. Veronica barrelieri attracts pollinators with its attractive flower appearance and specialized metabolites such as free VCs, which are environmentally friendly and possible natural botanical pesticides.

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Barrelier’s Speedwell (Veronica barrelieri Schott ex Roem. et Schult., Plantaginaceae)—Potential of Free Volatile Compounds for Horticulture

Linariifolioside II (1) and (2S)-2-hydroxy-5-oxoproline methyl ester (2), two new compounds along with 13 known compounds were obtained from the aerial part of Pseudolysimachion linariifolium Holub subsp. dilatatum (Nakai & Kitag.) D.Y. Hong. Their chemical structures were revealed mainly through NMR and MS data. The absolute configuration of 2 was deduced by comparing its experimental CD with the calculated ECD spectra. At a concentration of 1 mm, total antioxidant capacities of compounds 1-15 were measured using a rapid ABTS method in vitro. Compounds 1, 3-5, and 11-14 exhibited approximately equal antioxidant capacity to that of vitamin C (Vc).

Xiaoyi Zhou

Papers

Phenols and γ‐Lactams from the Aerial Part of Pseudolysimachion linariifolium subsp. dilatatum