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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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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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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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A new synthesis of fluorinated 4H-1,4-benzothiazines is being reported for the first time, obtained by condensing O-aminobenzenethiol with fluorinated β-diketones. An oxidative cyclisation mechanism, involving an intramolecular nucleophilic attack in an intermediate enamine system is suggested. 相似文献
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Summary The synthesis has been effected of 3-0-acetyl-4-0-trityl- and 4-0-acetyl-3-0-trityl-1,2-0-[(l-exo-cyano)ethylidene]-p-L-arabinopyranose by the polycondensation of which (1 4)-L-arabinopyranan and (1 3)-L-arabinopyranan were obtained containing 1,2-trans- and 1,2-cis-glycosidic bonds at a ratio 31.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 196–199, January, 1986. 相似文献
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Synthesis of santiagonamine 总被引:1,自引:0,他引:1
The first total synthesis of santiagonamine (1) is achieved in 12 steps from isovanillin. A palladium-catalyzed Ullmann cross-coupling reaction and a photocyclization are the key steps in the synthesis. 相似文献
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《Tetrahedron letters》1984,25(44):4995-4996
The synthesis of polynaphthoquinone in nitric acid was found to require N(III) catalysis. 相似文献
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The 6H-pyrido[4,3-b]carbazole system is efficiently synthesized by intramolecular attack of an ester enolate on an unactivated pyridinium salt. 相似文献
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Simon Steinhauer Dr. Tobias Böttcher Nico Schwarze Beate Neumann Dr. Hans‐Georg Stammler Prof. Dr. Berthold Hoge 《Angewandte Chemie (International ed. in English)》2014,53(48):13269-13272
Chlorosilicates represent important intermediates in SN2 reactions of chlorosilanes. They can be stabilized by the introduction of electron‐withdrawing substituents. Salts of various (pentafluoroethyl)chlorosilicates have been isolated and structurally characterized. 相似文献
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Three isomeric substituted thienoimidazothiazoles were synthesized as thiophene analogs of the immune modulator TILOMISOL, by cyclizing appropriate β-oxothioethers of thienoimidazoles. In contrast to the benzene analog no intermediates were observed at this step. 相似文献