Results 161 to 170 of about 2,274 (220)

Ketoimines of Cardenolides

Chemistry of Natural Compounds, 2005
3-Keto-derivatives of the cardenolides digitoxigenin and cardiogenin were prepared with subsequent conversion to new ketoimines (1–19, 24–44), the oxime (23), and for the first time to pure cardiogenin (14,16-dianhydrogitoxigenin, 20), its acetate (21), and cardiogenone (22). Their physicochemical properties were described.
I. F. Makarevich, Yu. I. Gubin, R. Megges   +2 more
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ChemInform Abstract: PARTIAL SYNTHESES OF CARDENOLIDES AND CARDENOLIDE ANALOGS. VIII. LACTONE RING‐ALKYLATED CARDENOLIDES

Chemischer Informationsdienst, 1984
AbstractBehandeln der Cardenolide (I) mit NaH in DMF, anschließen de Zugabe der Alkylhalogenide (II) binnen fünf Minuten und Ansäuern der Ansätze liefern die Monoalkylderivate (III) als Hauptprodukte, daneben die Dialkylderivate (IV).
B. STRECKENBACH, P. FRANKE, R. HINTSCHE, H. J. PORTIUS, K. R. H. REPKE   +4 more
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Cardenolides from Adonis aestivalis

Phytochemistry, 1992
Four cardenolides were isolated for the first time from the aerial parts of Adonis aestivalis. The compounds were identified by spectrometry and for 3-epi-periplogenin, helveticoside also by comparison with authentic substances. Two new cardenolides were structurally elucidated: strophanthidin-3-O-beta-D-digitoxosido-alpha-L-cymarosido-be ta-D ...
B, Kopp, L, Krenn, E, Kubelka, W, Kubelka   +3 more
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Cardenolides from Nierembergia aristata

Journal of Natural Products, 1995
The EtOAc extract of the whole plant of the Argentinian species Nierembergia aristata showed significant cytotoxicity against eleven different cancer cell lines. In addition to several known compounds, bioassay-guided fractionation led to the isolation of three new cardenolides, 17-epi-11 alpha-hydroxy-6, 7-dehydrostrophanthidin-3-O-beta ...
R R, Gil, L Z, Lin, H B, Chai, J M, Pezzuto, G A, Cordell   +4 more
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Ring-D fragmentation of cardenolides

Biological Mass Spectrometry, 1977
The major fragmentation paths typical for the cardenolides system have been elucidated by labelling studies.
E, Flaskamp, H, Budzikiewicz
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Cardenolides from Erysimum cheiranthoides

Phytochemistry, 1996
Three new cardiac glycosides were isolated along with two known cardenolides from the seeds of Erysimum cheiranthoides. The new ones were characterized by spectral methods as 16 beta-hydroxystrophanthidin (strophadogenin) 3-O-beta-glucopyranosyl-(1-->4)-beta-boiviopyranoside, strophadogenin 3-O-alpha-rhamnopyranosyl-(1-->4)-beta-digitoxopyranoside and ...
Z H, Lei, S, Yahara, T, Nohara, T B, Shan, J Z, Xiong   +4 more
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ChemInform Abstract: CARDENOLIDES. I. RING D CLEAVAGE OF CARDENOLIDES

Chemischer Informationsdienst, 1982
AbstractDie Einwirkung von Ozon auf die Cardadienolide (I) und nachfolgende reduktive Aufarbeitung führen überraschenderweise nicht zum Abbau des Butenolidringes, sondern nahezu ausschließlich zur D‐Ringspaltung unter Bildung der 14,1 S‐Seeocardenolide (IIa) und (IIb) bzw. (Ile).
E. COHNEN, K. WEDEMEIER, V. SINNWELL
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ChemInform Abstract: PARTIAL SYNTHESES OF CARDENOLIDES AND CARDENOLIDE ANALOGS. II. SYNTHESIS OF CARDENOLIDE‐ANALOGOUS Γ‐STEROIDYL BUTENOLIDES

Chemischer Informationsdienst, 1981
AbstractDie Ausgangsverbindung zur Synthese der Cardenolid‐Analogen (III) und (IV) bzw. (VI) ist das in hoher Ausb. nach bekannter Methode erhaltene β‐Ketosulfoxid (I).
F. THEIL, C. LINDIG, K. REPKE
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Cardenolide analogues. 3. A fast thin layer Chromatographic separation of cardenolide diastereomers

Steroids, 1978
Cardenolide diasteromeric mixtures may be analytically separated on 2.5 x 6.5 cm x 0.25 mm pre-coated silical gel 60 F-250 (EM) tlc plates (cut from 20 x 20 cm plates). Three successive developments in mixtures of CH2Cl2-EtOAc-MeOH achieve complete separation of diastereomers in less than 15 minutes, and 2--6 micrograms of sample is sufficient.
K, Yoshioka, D S, Fullerton
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ChemInform Abstract: PARTIAL SYNTHESES OF CARDENOLIDES AND CARDENOLIDE ANALOGS. III. SYNTHESIS OF CARDENOLIDE‐ANALOGOUS METHYL β‐STEROIDYLCROTONATES

Chemischer Informationsdienst, 1981
AbstractDas Ausgangsprodukt für die Synthesen der Cardenolid‐Analogen (VII) bzw. (XI) ist das aus dem Iodketon (I) erhaltene (II).
F. THEIL, C. LINDIG, K. REPKE
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