共查询到20条相似文献,搜索用时 15 毫秒
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Structure and synthesis of nojirimycin 总被引:3,自引:0,他引:3
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The novel cyclopentenoid monoterpene, gastrolactone (), was synthesized from carvenolide (), and the synthetic material was found to be identical to the natural product by direct comparison. This synthesis confirmed structure which had been suggested earlier on the basis of spectral data. 相似文献
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Wolfgang Pfleiderer 《Tetrahedron letters》1984,25(10):1031-1034
The structure of leucettidine () has been revised according to its UV-data to 6-(1-hydroxypropyl)-1-methyllumazine and has been proven by an unambiguous synthesis of this natural product. 相似文献
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Mugio Nishizawa Hidetoshi Yamada Setijati Sastrapradja Yuji Hayashi 《Tetrahedron letters》1985,26(12):1535-1536
The structure of an unsymmetrical dimeric sesquiterpene named bicalamenene has been established based on the spectral study and synthesis. 相似文献
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《Tetrahedron letters》1987,28(46):5643-5646
A reinvestigation ofEumorphia prostata afforded two new furanosesquiterpenes. The structure of eumorphistonol has been determined by synthesis. Two further furans were prepared and the absolute configuration of the main compound was deduced by a chiral synthesis. 相似文献
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Trost BM Harrington PE Chisholm JD Wrobleski ST 《Journal of the American Chemical Society》2005,127(39):13598-13610
The structure elucidation of (+)-amphidinolide A, a cytotoxic macrolide, has been accomplished by employing a combination of NMR chemical shift analysis and total synthesis. The 20-membered ring of amphidinolide A was formed by a ruthenium-catalyzed alkene-alkyne coupling to forge the C15-C16 bond. Using the reported structure 1 as a starting point, a number of diastereomers of amphidinolide A were prepared. Deviations of the chemical shift of key protons in each isomer relative to the natural material were used as a guide to determine the locations of the errors in the relative stereochemistry. The spectroscopic data for the synthetic and natural material are in excellent agreement. 相似文献
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The focus of this review is to highlight the structure, bioactivity and biosynthesis of naturally occurring aryl-C-glycosides. General synthetic methods and their relevance to proposed biochemical mechanisms for the aryl-C-glycoside bond formation are also presented. 相似文献
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Structures propounded for the four aryltetralin lignan constituents isolated from Linn. are confirmed by syntheses of their (±)-forms. 相似文献
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[structure: see text] By total synthesis, mycolactone C has been established as an approximately 1:1 mixture of Z-Delta4'5'- and E-Delta4'5'-geometric isomers of C12'-deoxymycolactones A and B. 相似文献
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The structure of deplancheine , an indoloquinolizidine alkaloid of a novel type, has been established from its spectral properties and also by an orginal synthesis. 相似文献
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The isolation of a further chlorophenol acetylene from Helichrysum coriaceum as well as the synthesis of three naturally occurring chlorophenols are described. 相似文献
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Michio Yamashita Yoshio Kawai Itsuo Uchida Tadaaki Komori Masanobu Kohsaka Hiroshi Imanaka Kazuo Sakane Hiroyuki Setoi Tsutomu Teraji 《Tetrahedron letters》1984,25(41):4689-4692
The structure elucidation and total synthesis of chryscandin (1), a new antifungal antibiotic produced by No.4629, is reported. 相似文献