Phospholipids of the pericarp ofCrataegus turkestanica

Phospholipids of the pericarp of Crataegus turkestanica have been studied and 12 classes of phospholipids have been detected, the main ones being phosphatidylcholine, phosphatidylethanolamine, and phosphatidylinositol. The composition and position distribution of the fatty acids of the main phospholipids have been studied.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (3712) 89 14 75. Translated from Khimiya Prirodnykyh Soedinenii,No. 4, pp. 562–563, July–August 1995. Original article submitted October 24, 1994.     

Natural flavonoid C-glycosides

The paper gives a review of flavonoid C-glycodes.Pyatigorsk Pharmaceutical Institute. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 5–24, January–February, 1981.     

Phospholipids of the fruit kernels ofCrataegus turkestanica

The lipids of the kernels of the fruit ofC. turkestanica contain five classes of phospholipids, the main ones being phosphatidylcholine, phosphatidylinositol, and phosphatidylethanolamine. Their fatty acid compositions and, in the main phospholipids, the position distributions of the acyls have been studied.     

Acylated C-glycosides ofIris lactea

From the epigeal part ofIris lactea two acylated C-glycosylflavones not described in the literature have been isolated. On the basis of chemical transformations, and the results of UV, IR, and NMR spectroscopy, the following structures have been established for them: substance (I) — 5-hydroxy-4',7-dimethoxyflavone 6-C-[0-(2-acetyl--L-rhamnopyranosyl)-(12)-x-acetyl--D-glycopyranoside] (diacetylembinin); substance (II) — 5-hydroxy-4',7-dimethoxyflavone 6-C-[0(2-acetyl--L-rhamnopyranosyl)-(12)-D-glycopyranoside] (acetylembinin). The existence of rotamers for 6-C-glucoflavones has been established for the first time.Leningrad Institute of Pharmaceutical Chemistry, All-Union Scientific-Research Institute of Medicinal Plants, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 589–595, September–October, 1984.     

Ultrasound-assisted synthesis of C-glycosides

A significant rate enhancement was observed in the preparation of allyl and allenyl-C-glycosides from glycosyl acetate or methyl O-glycoside precursors when ultrasound irradiation was employed as an energy source. The C-glycosides were obtained in 77-96% yields in <20 min using TMSOTf as promoter. These results show that sonication provides rapid and efficient access to useful C-glycoside-based building blocks.     

C-glycosides of Desmodium canadense

Chemistry of Natural Compounds -     

Flavone C-glycosides from Anthurium andraeanum

We describe here the isolation of three flavone 6-C-glycosides from the leaves of Anthurium andraeanum, The two new flavones were identified through detailed spectroscopic analysis as 4"'-(3,4-dimethoxycinnamoyl)-embinin (2) and 4"'-ferruloyl-embinin (3).     

C-glycosides from O-glycosyl trichloroacetimidates

From O-glycosyl trichloroacetimidates $\text{2}$, $\text{9}$, and $\text{13}$ and activated benzene derivatives C-aryl glycosides were obtained by mild Lewis acid catalysis. In most cases only one stereoisomer was formed, however, the α-alkoxyalkyl transfer took place not always by inversion of configuration at the anomeric center.