共查询到20条相似文献,搜索用时 15 毫秒
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Andrew Pelter Redha AI-Bayati Rudolf Ha̋nsel Hildegard Dinter Basil Burke 《Tetrahedron letters》1981,22(16):1545-1548
The isolation, structure and synthesis of 5,6-- and - fadyenolides, the simplest butenolides of the piperolide series, are reported. 相似文献
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All four isomers of substituted 3-alkylthio-4-hydroxybutenes have been synthesised: both the geometry of the double bond and the relative stereochemistry of the two chiral centres are controlled. 相似文献
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A new ten-membered lactone, pyrenolide A, was identified as a new fungal morphogenic substance and its structure including absolute stereochemistry was elucidated. 相似文献
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The structure of a novel 2,3,4- trisubstituted furanoid lignan, designated sylvone, was established as from detailed spectroscopical and chemical studies. 相似文献
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A new toxic metabolite was isolated from and the structure was determined by X-ray diffraction analysis. The metabolite was designated as paraherquamide. 相似文献
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The structure of engleromycin isolated from Hennings has been established as by spectral techniques. 相似文献
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Sterepolide and dihydrosterepolide, new sesquiterpenes isolated from the fungus , are assigned structures and , respectively. The assignments are based mainly on spectroscopic studies and similarities to isolactarorufin (). A possible mode of biogenesis of these isolactarane type sesquiterpenes is discussed. 相似文献
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N-Acyl derivatives of ,-acosamine and ,-ristosamine were synthesized with high stereo selectivity utilizing intramolecular Michael addition of γ- and δ-carbomoyloxy-α,β-unsaturated esters. 相似文献
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Hirokazu Tanaka Yoshikuni Itoh Hiroichi Ikushima Masanori Okamoto Yoshio Kawai Hiroshi Imanaka 《Tetrahedron letters》1980,21(45):4359-4360
The structure elucidation and synthesis of WS 5995, produced by , were described. 相似文献
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J Leitich 《Tetrahedron letters》1980,21(32):3025-3028
The relative rates of formation of and [2+2]cycloadducts of benzyne to , - and , -1,5-cyclooctadiene, - and -cyclooctene are discussed and properties of the adducts (e.g., their unusual hydrogenation) are described. 相似文献