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  • 1
    Electronic Resource
    Electronic Resource
    Conversion of erysimin into cymarin (1967)
    Springer
    Pharmaceutical chemistry journal 1 (1967), S. 328-329 
    Details
    ISSN: 1573-9031
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00766120
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  • 2
    Electronic Resource
    Electronic Resource
    Partial synthesis of erychroside (1968)
    Springer
    Chemistry of natural compounds 2 (1968), S. 341-344 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The partial synthesis of erychroside from erysimin and D-xylose has been carried out with a yield of 22%. It has been shown that the condensation of erysimin with bromoacetylxylose takes place predominantly at the C4 equatorial hydroxyl of the digitoxose residue and to a considerably smaller extent at the C3 axial hydroxyl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00564219
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  • 3
    Electronic Resource
    Electronic Resource
    19-Norcardenolides (1985)
    Springer
    Chemistry of natural compounds 21 (1985), S. 67-71 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The products of the autooxidation of the cardenolides strophanthidin and erysimin in solutions have been studied. It has been established that the autooxidation of 19-oxocardenolides forms, together with 19-carboxylic acids, a complex mixture of 19-norcardenolides. The bulk of them consists of 10β-OH compounds and a smaller proportion of 10β-H compounds. Autooxidation affects both the functional group at C-10 and its transformation and also other groupings and bonds in ring A and, to some extent, in ring B, including the oxidation of the 3β-OH group, degradation of the 5β-OH group, and cleavage of the C5-C10 bond with the formation of 5,10-seco-19-norcardenolides. A possible mechanism of the formation of 19- norcardenolides is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00574252
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  • 4
    Electronic Resource
    Electronic Resource
    Separation of conformational isomers in the 5,10-secocardenolide series. I. (1985)
    Springer
    Chemistry of natural compounds 21 (1985), S. 72-76 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A rare case of separable conformational isomers in the 5,10-diketo-5,10-secocardenolide series has been found. Thus, the periodate oxidation of 10β-hydroxy-19-norperiplogenin has given 3β,14β-dihydroxy-5,10-diketocard-19-nor-5,10-seco-20(22)-enolides which in fact consist of a mixture of conformers formed as the result of the inversion of the AB ring. A method for separating the four conformers, their properties, their IR, mass, and PMR spectra, the kinetics of their acetylation reactions, and their heats of transformation are described. Conformational structures as the most probable are put forward on the basis of the experimental results obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00574253
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal tranformation of cardiac glycosides (1991)
    Springer
    Chemistry of natural compounds 27 (1991), S. 53-55 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermal transformations of cardiac glycosides in neutral alcoholic solutions have been investigated. The kinetics of their acidless hydrolysis at 100 and 142°C and the activation energy of the process have been studied. The possibility has been shown of the stepwise hydrolysis of natural trisdigitoxosides with the production of difficulty available mono- and bisdigitoxosides. The following were used as the objects of investigation: convallatoxin, glucostrophanthidin, cheirotoxin, desglucocheirotoxin, erycordin, erysimin, erysimoside, digitoxin, and cymarin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00629831
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of convalloside (1988)
    Springer
    Chemistry of natural compounds 24 (1988), S. 323-325 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The known natural diglycoside convalloside — strophanthidin 3β-O-[4-O-β-d-glucopyranosyl-α-L-rhamnopyranoside] — has been synthesized. The synthesis was carried out by the Koenigs-Knorr method via the preparation as intermediates of convallatoxin and its 2,3-isopropylidene derivative. Selectivity of glycosylation was achieved by the preliminary protection of the two OH groups in the cardenolide L-rhamnoside (convallatoxin).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00598579
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  • 7
    Electronic Resource
    Electronic Resource
    Cardiac glycosides of Erysimum contractum. II (1992)
    Springer
    Chemistry of natural compounds 27 (1992), S. 610-611 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structure of a new cardiac glycoside isolated from the seeds ofErysimum contractum has been established. The glycoside, which has been called nigrescigenin digilanidobioside is 3β,5,11α,14-tetrahydroxy-19-oxo-5β,14β-card-20(22)-enolide 3-O-(4-O-β-D-glucopyranosyl-β-D-digitoxopyranoside).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00630365
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  • 8
    Electronic Resource
    Electronic Resource
    Conversion of erysimoside into k-strophanthin-β (1968)
    Springer
    Chemistry of natural compounds 3 (1968), S. 180-181 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00568002
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  • 9
    Electronic Resource
    Electronic Resource
    Alliotoxin and alliotoxigenin (1972)
    Springer
    Chemistry of natural compounds 5 (1972), S. 163-164 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00636026
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  • 10
    Electronic Resource
    Electronic Resource
    Glucoevonogenin and glucoevonoloside (1972)
    Springer
    Chemistry of natural compounds 5 (1972), S. 167-168 
    Details
    ISSN: 1573-8388
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00636030
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