Structure of convosine

From the roots of the plantConvolvulus subhirsutum Regel et Schmalh. have been isolated seven known alkaloids and one new one, for which, on the basis of spectral characteristics, a comparative study with known alkaloids of the tropane series, and synthesis, the structure of (+)-N-isopropyl-3-veratroyloxynortropane has been established.Institute of the Chemistry of Plant Substances of the Uzbek Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 618–620, September–October, 1986.     

Berberis alkaloids. XXXVII. Investigation of the alkaloids ofB. oblongata andB. integerrima. Crystal structure of 8-trichloromethyldihydroberberine

Two species of Berberis have yielded 10 isoquinoline alkaloids. In addition to known bases, two artifacts have been isolated — 8-trichloromethyldihydroberberine (I) and 8-trichloromethyldihydropalmatine. An x-ray structural analysis has been made of (1).Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 889–893, November–December, 1996. Original article submitted April 15, 1996.     

NMR investigation of alkaloids. XI.13C NMR spectra and structure of codonopsine and codonopsinine

An assignment of the signals in the¹³C NMR spectra of the alkaloids codonopsinine and codonopsine has been made on the basis of selective double heteronuclear resonance experiments. Institute of the Chemistry of Plant Substances, Uzbek SSR Academy of Sciences, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 536–538, July–August, 1989.     

Quaternary Derivatives of α- and β-Scopodonnines and Their Pharmacologic Activity

Several quaternary alkyl halides were synthesized from dimeric tropane alkaloids - and -scopodonnines, which were prepared by dimerization of hyoscine. Their pharmacologic activities were studied.     

Mass spectra of the alkaloids ofDipthychocarpus strictus

The mass spectra of diptocarpaine, diptocarpamine, diptocarpiline, and diptocarpidine, isolated fromDipthychocarpus strictus, have been studied. These compounds have proved to be derivatives of alkylureas, the substituents in them being mainly methylthio-n-hexyl and methylsulfinyl-n-hexyl radicals and the products of their chemical transformation. It has been established that mass-spectrometric fragmentation of these compounds takes place with the formation of heterocyclic ions.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 365–370, May–June, 1980.     

Low-molecular-weight mushroom metabolites V. Eburicoic acid fromPolyporus ailanthus

The triterpene acid isolated fromPolyporus ailanthus (Aphyllophorales) is identified as eburicoic acid on the basis of¹H and¹³C NMR, electron-impact mass, and IR spectra.S. Yu. Yunusov Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (998-71)-120-64-75. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 57–59, January–February, 2000.     

Alkaloids from Arundo donax. XVII. Structure of the Dimeric Indole Alkaloid Arundaphine

The newdimeric alkaloid arundaphine, a tryptamine-tryptamine base, was isolated from roots and rhizomes of Arundo donax (Poaceae). Spectral data and an x-ray structure analysis established its structure as 1-[3-(2-dimethylaminoethyl)-5-hydroxy-1H-4-indolyl]-3-hydroxy-3-(2-methylaminoethyl)-2-indolinone.