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Ghosh S Shang M Li Y Fehlner TP 《Angewandte Chemie (International ed. in English)》2001,40(6):1125-1128
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A series of 1,1'-dicinnamoylferrocenes were converted to the corresponding [3]ferrocenophane diols (4a-e) in a stereoselective manner by using samarium diiodide to effect the intramolecular coupling reaction, aldol reaction, and reduction in one-pot operation. The major reaction pathway might be derived from a samarium chelated transition state (I(A)()) having the moieties of s-cis enone and (Z)-enolate. A solid-state structure of such [3]ferrocenophane diol product showed that the cyclopentadienyl groups were in an eclipsed orientation and slightly tilted. 相似文献
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以六溴甲基苯为核心,季戊四醇三烯丙基醚为支化单元,采用收敛法合成了六方向,具有18个末端烯丙基的多烯烃体系。 相似文献
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N-酰基吡唑类化合物作为酰化试剂逐步引起了广泛关注,对其制备以及在醇解,氨解,格氏反应,瑞福尔马斯基反应等方面的用途做了探讨. 相似文献
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Simon J. Dunne Lindsay A. Summers Ellak I. Von Nagy-Felsobuki 《Journal of heterocyclic chemistry》1992,29(1):117-119
2,3′-Selenobispyridine, 2,4′-selenobispyridine, 3,3′-selenobispyridine and 3,4′-selenobispyridine have been synthesised. 相似文献
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K.C. Nicolaou 《Tetrahedron》1977,33(7):683-710
The biologically important macrolide class of natural products, although known for some time, has until recently received little synthetic attention. This was primarily due to the lack of general synthetic methodology and the complex structures involved, but in recent years has changed with the development of new experimental techniques. The recent synthetic advancements in this area, reported from the laboratories of Prof. E.J. Corey of Harvard University were undoubtedly the most powerful single thrust that brought these medicinally useful molecules into focus and propelled them into the forefront of organic synthesis. Following a brief introduction into the macrolide structural spectrum, the general methodology for macrolide synthesis is discussed in detail with several illustrative applications. A number of total syntheses of macrolides is then detailed with particular emphasis on the key macrolide ring-forming reactions. 相似文献
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The structure (I) assigned to the alkaloid avicine has been confirmed by a synthesis of oxyavicine (III). 相似文献
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9-Alkylaryl- and 9-aryl-sym-octahydrothioxanthenes disproportionate with hydride ion transfer under the influence of protic acids to give 9-methyl-, 9-ethyl-, 9-propyl-, 9-phenyl-, and 9-(p-tolyl)perhydrothioxanthenes and their sulfones.See [7] for communication VIII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 196–198, February, 1973. 相似文献
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The indole alkaloid barettin (with bromine in 6-position), isolated from the marine sponge Geodia Barretti, has been synthesised via a Horner-Wadsworth-Emmons type reaction from 6-bromoindole-3-carboxaldehyde to introduce the dehydro-functionality. Subsequent deprotection and cyclisation afforded the natural product in Z-conformation. 相似文献
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The structure of the sugar obtained by acid hydrolysis of the antibiotic Sordarin has been verified by a synthesis of the corresponding α-methylglycoside. 相似文献