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A new glycoside of the cycloartane series — cyclofoetoside A — has been isolated from the epigeal part ofThalictrum foetidum L., and its structure has been established on the basis of chemical transformations and spectral characteristics as 24S-cycloartane-3β,16β,24,25-tetraol 3-0-α-L-arabinopyranoside 16-0-[0-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside].
A new diterpenoid acid of the clerodane series, C20H32O4, [α] D 20 −75.4° (c 0.26; methanol), which has been called salvicin, and the known flavonoid rutin have been isolated from a chloroform extract of the epigeal part ofPulicaria salviifolia. The structure of salvicin has been established on the basis of spectral characteristics and chemical… (More)
Early pharmacological studies of Aconitum and Delphinium sp. alkaloids suggested that these neurotoxins act at site 2 of voltage-gated Na(+) channel and allosterically modulate its function. Understanding structural requirements for these compounds to exhibit binding activity at voltage-gated Na(+) channel has been important in various fields. This paper… (More)
Six bases have been isolated from the leaves of the plantZiziphus jujuba Mill. family Rhamnaceae, cultivated in Tashkent: coclaurine, which has been isolated previously, and isoboldine, norisoboldine, asimilobine, which have been isolated for the first time, and the new juziphine and juzirine. It has been established that juziphine has the structure of… (More)
mechanical shifts of the qua te rnary methyl groups,, posi t ion Cll is the m o s t l ikely fo r the hydroxy group. The use of Eu(DPM) 3 conf i rmed this assumpt ion, since with only a smal l change in the s ignals of the t e r t i a r y methyl groups at C 1 and C a (0.93, 0.98 ppm), a pronounced downfield shif t of the s inglets of the equivalent qua te… (More)
In addition to alkaloids isolated previously, young shoots of Berberis amurensis Rupr. have yielded berberrubine, oxyacanthine, and pseudopalmatine, and the new amorphous base amurenine. It's structure has been established on the basis of spectral characteristics and chemical transformations.
A new withasteroid — physangulide — has been isolated from the leaves ofPhysalis angulata L. It has been shown that physangulide is the first natural 22S-withanolide. Its structure has been determined as 3β,4β,20,24,25-pentahydroxy-1-oxo-5β,6β-epoxy-20R,22S,24S,25R-withanolide. Its1H and13C NMR spectra, confirming this interpretation, are given.
From young shoots ofBerberis turcomanica Kar. we have isolated the new bistetrahydroisoquinoline base turconidine. Its structure has been established by the results of UV, mass, and PMR spectroscopies and also from measurements of intramolecular NOEs.
A new glycoside of the spirostan series — karatavioside B (I) — has been isolated from an ethanolic extract of the inflorescences ofAllium karataviense Rgl. (family Liliaceae). On the basis of chemical transformations and spectral characteristics the structure of (I) has been established as 25(R)-spirost-5-ene-2α,3β-diol… (More)