Journal ArticleDOI
Total synthesis of novel xanthone antibiotics (±)-cervinomycins A1, and A2
TLDR
In this paper, a total synthesis of novel heptacyclic antibiotics cervinomycin A1 1 and A2 2 following a convergent approach is reported, where the cornerstone of the strategy was the construction of the central ring D through photochemical electrocyclization.About:
This article is published in Tetrahedron.The article was published on 1994-01-01. It has received 38 citations till now. The article focuses on the topics: Total synthesis & Xanthone.read more
Citations
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Photochemical reactions as key steps in natural product synthesis
Thorsten Bach,Jörg P. Hehn +1 more
TL;DR: The most important photochemical transformations that have been employed in natural product synthesis are presented and selected total syntheses are discussed as examples, with particular attention given to the photochemical key step and its stereoselectivity.
Journal ArticleDOI
Tetraoxygenated naturally occurring xanthones
Valdir Peres,Tanus Jorge Nagem +1 more
TL;DR: This review, with 350 references, gives information on the chemical study of 234 naturally occurring tetraoxygenated xanthones in 12 families, 53 genus and 182 species of higher plants, and two which are described as fungal and lichen metabolites.
Journal ArticleDOI
Xanthones from Fungi, Lichens, and Bacteria: The Natural Products and Their Synthesis
Kye-Simeon Masters,Stefan Bräse +1 more
TL;DR: In this article, the authors describe the xanthones as "privileged structures" and describe methods for the construction of the (polysubstituted) unsaturated xanthone core.
Journal Article
Xanthones from fungi, lichens, and bacteria : the natural products and their synthesis
Kye-Simeon Masters,Stefan Bräse +1 more
TL;DR: The fascinating structural and biological properties of xanthone dimers and heterodimers may excite the synthetic or natural product chemist.
Journal ArticleDOI
Photochemische Reaktionen als Schlüsselschritte in der Naturstoffsynthese
Thorsten Bach,Jörg P. Hehn +1 more
TL;DR: In this article, die wichtigsten Umsetzungen der photochemie vorgestellt, die auf breiter Front Einzug in die Naturstoffsynthese gehalten haben.
References
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A convenient synthesis of quinones from hydroquinone dimethyl ethers. Oxidative demethylation with ceric ammonium nitrate
TL;DR: The vinyl proton of the E isomers 5 were consistently shifted downfield -1 .O ppm from the corresponding Z isomers 6: G. Buchi and H. Wuest, Helv.
Journal ArticleDOI
Oxidative cleavage of hydroquinone ethers with argentic oxide
Clinton D. Snyder,Henry Rapoport +1 more
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Synthesis of (.+-.)cervinomycins A1 and A2
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Studies in the xanthone series. Part XII. A general synthesis of polyoxygenated xanthones from benzophenone precursors
TL;DR: In this paper, various 2-mono-, 2-3- and 1-7-di-, 1,3,7-, 1-5,6, 1-6,7- and 2, 3,4,5-tetra-, and 1.3, 5, 6, 7-penta-oxygenated xanthones have been synthesized by preparation of 2-hydroxy-2′-methoxybenzophenones under Friedel-Crafts conditions, and subsequent base catalysed cyclisation to eliminate methanol.
Journal ArticleDOI
Citreamicins, novel antibiotics from micromonospora citrea: isolation, characterization, and structure determination
TL;DR: A new family of antibacterial antibiotics has been isolated from Micromonospora citrea of the polycyclic xanthone structure type and their isolation, characterization and structure determination are presented.