Isolation and structural elucidation of new 18-membered macrolide antibiotics, viranamycins A and B.
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منابع مشابه
Mycinamicins, new macrolide antibiotics. XII. Isolation and structural elucidation of mycinamicins X and XI.
covered four newminor componentsdesignated mycinamicins X (1), X' (2), XI (3) and XI' (4). From physico-chemical properties, spectroscopic data and chemical degradation studies, these compounds were shown to be analogs ofmycinamicins I (5) and II (6), whose structures are different from compounds 5and 6at the C-ll position. In this paper, wedescribe the isolation and structural elucidation of t...
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A novel C-homoprotoberberine alkaloid, Hediamine (2), has been isolated from the roots of Berberis actinucantha (Berberidaceae). Conclusive proof for the structure of hediamine was obtained by its comparison with the isomeric lactam (4), by chemical transformation, and by means of spectroscopic techniques (UV, IR, MS, NMR).
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Five novel 3-hydroxyl derivatives of sixteen-membered macrolide possessing 4-O-acyl-alpha-L-cladinose as a neutral sugar moiety were synthesized by using a combination of structurally stable silyl acetal protection and selective hydrogenolysis of a 3"-methylthiomethyl ether to a 3"-OMe group. Several derivatives having n-butyryl, i-butyryl and n-valeryl substituent at the 4"-OH group exhibited ...
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ژورنال
عنوان ژورنال: The Journal of Antibiotics
سال: 1991
ISSN: 0021-8820,1881-1469
DOI: 10.7164/antibiotics.44.1294