Results 201 to 210 of about 5,587 (239)
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Two cardenolides fromCalotropis procera
Magnetic Resonance in Chemistry, 1999Two 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 +5 more
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ChemInform Abstract: CARDENOLIDES. I. RING D CLEAVAGE OF CARDENOLIDES
Chemischer Informationsdienst, 1982AbstractDie 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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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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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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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 +2 more
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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 +2 more
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Journal of Fluorine Chemistry, 1985
Abstract For estimation of the influence of fluorination at C21 of the lactone ring of cardenolides on their cardiac activity we have synthesized 21α- and 21β-fluoro-cardenolides by treatment of 21β-bromo-cardenolides with AgF. Prior to allylic bromination of cardenolides their OH- groups are protected by CCl 3 CH 2 OCO- groups and deprotected after ...
R. Megges +5 more
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Abstract For estimation of the influence of fluorination at C21 of the lactone ring of cardenolides on their cardiac activity we have synthesized 21α- and 21β-fluoro-cardenolides by treatment of 21β-bromo-cardenolides with AgF. Prior to allylic bromination of cardenolides their OH- groups are protected by CCl 3 CH 2 OCO- groups and deprotected after ...
R. Megges +5 more
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Partialsynthesen von Cardenoliden und Cardenolid‐Analogen. VIII. Lactonring‐alkylierte Cardenolide
Journal für Praktische Chemie, 1983Partial Syntheses of Cardenolides and Cardenolide Analogues. VIII. Lactone Ring‐Alkylated CardenolidesBase‐catalyzed alkylation of digitoxigenin (1), digitoxin (2), digoxigenin (3), and gitoxigenin‐3,16‐diacetate (4) with allyl bromide, allyl chloride or n‐propyl bromide in DMF resulted in the formation of the 22‐allyl‐, 21ξ,22‐diallyl‐, 22‐propyl ...
Barbara Streckenbach +4 more
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SYNTHETIC CARDENOLIDES AND RELATED PRODUCTS
Pure and Applied Chemistry, 1970Abstract
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Cardenolide analogues. 3. A fast thin layer Chromatographic separation of cardenolide diastereomers
Steroids, 1978Cardenolide 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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Ring-D fragmentation of cardenolides
Biological Mass Spectrometry, 1977The major fragmentation paths typical for the cardenolides system have been elucidated by labelling studies.
E, Flaskamp, H, Budzikiewicz
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Antiproliferative cardenolides from Periploca graeca
Planta Medica, 2007Nine cardiotonic steroids, six 17beta-cardenolides (2, 4, 6-9) and three 17alpha-cardenolides (1, 3, 5) have been identified from the chloroform and chloroform-methanol extracts of Periploca graeca L. (Asclepiadaceae) stems. Among these, compound 5, the 17alpha-isomer of periplocin 6, was identified as a new compound.
D. SPERA +4 more
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