Results 111 to 120 of about 1,572 (155)

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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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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Synthesis of cardenolide glycosides and putative biosynthetic precursors of cardenolide glycosides

Steroids, 1998
A rapid and efficient procedure for glycosylation of steroids was established using a modified Koenigs-Knorr procedure. Peracetylated beta-glycosides were synthesized by reaction of cardenolides, various pregnanes and 23-nor-5,20(22)E-choldienic acid at room temperature with the peracetylated 1-bromo derivatives of D-glucose, D-galactose, D-fucose and ...
M, Luta, A, Hensel, W, Kreis
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Cytotoxic cardenolides from Calotropis gigantea

Phytochemistry, 2021
Sixteen cardiac glycosides, including five previously undescribed compounds, were extracted and purified from whole plants of Calotropis gigantea (L.). Spectroscopic data and electronic circular dichroism (ECD) analyses were used to determine their structures.
Yi-Lin, He, Hong-Ying, Yang, Pei-Zhi, Huang, Wei-Jiao, Feng, Kun, Gao   +4 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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Two cardenolides fromCalotropis procera

Magnetic Resonance in Chemistry, 1999
Two cardiotonic glycosides were isolated from Calotropois procera; one of them (1) is a new natural product. Their structures were elucidated by extensive application of oneand two-dimensional 1H and 13C NMR spectroscopy. Copyright  1999 John Wiley & Sons, Ltd.
Atef G. Hanna, M. Hani A. Elgamal, Nagy A. M. Morsy, Helmut Duddeck, József Kovács, Gábor Tóth   +5 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. 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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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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