共查询到20条相似文献,搜索用时 15 毫秒
1.
Pnina Ashkenazi Moshe Kapon Umberto Piantini Wolfgang Von Philipsborn David Ginsburg 《Helvetica chimica acta》1985,68(3):614-617
Oxidation of the title compound with m-chloroperbenzoic acid affords a keto-lactone, two bis-lactones and a bis-spirolactone, in varying amounts depending upon the reaction conditions. The structures were established by means of X-ray diffraction, 1H- and 13C-NMR spectroscopy. 相似文献
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《Tetrahedron》1988,44(22):6875-6880
A spherical cyclic diester has been prepared from the title components, separated from by-products, and purified by aid of double labelling of the components with 3H and 14C, respectively. The product may be viewed as a doubly-anchored rotaxane. 相似文献
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3,7,10-Tribenzyl-3,7,10-triaza[3.3.3]propellane ( 4a ), 3,7-dibenzyl-10-phenyl-3,7,10-triaza[3.3.3]propellane ( 4c ), 3,7-dibenzyl-10-(p-tolyl)-3,7,10-triaza[3.3.3]propellane ( 4b ), and 3-oxa-7,10-diaza[3.3.3]propellane ( 6 ) have been prepared. 相似文献
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Propellanes. Part LXIX. Preparation of lactones from the three isomeric [4.3.3]propellane-8,11-diols
Soundararajan Bhanumati Pnina Ashkenazi Shmuel Migdal David Ginsburg 《Helvetica chimica acta》1983,66(8):2703-2706
Each of the three isomeric[4.3.3]propellane-8,11-diols was lactonized by using 1, ω-diacids of different chain lengths. The minimal chain length required to bridge the syn-syn diol is –CO(CH2)11CO–. 相似文献
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Reactions of 11-substituted-1, 6-methano [10]annulenes and 1, 6-methano [10]-annulenes substituted in the aromatic ring with the title dienophile are described. 相似文献
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The title compounds have been isolated and their structures determined by X-ray crystallography. Their relative stability is discussed in terms of theory and experiment. The endo-adduct is the thermodynamically more stable one. 相似文献
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Attack of a number of [4.4.2]propellanes by the dienophile named in the title occurs, when one equivalent of dienophile is used, for the direction anti- to the 4-membered ring. 相似文献
11.
Dhiab A-J. Al-Sammerrai James T. Ralph David E. West 《Journal of heterocyclic chemistry》1980,17(8):1705-1708
The synthesis and some reactions of pyrrolo[1,2-a]quinoxaline-6,9-dione and pyrrolo[2,1-c][1,2,4]benzotriazine-6,9-dione are described. 相似文献
12.
Shubina T. E. Gunchenko P. A. Vigovskaya T. S. Schreiner P. R. Yurchenko A. G. Fokin A. A. 《Theoretical and Experimental Chemistry》2002,38(4):229-236
The structure of [3.3.2]- and [3.3.3]propellanes, their framework analogs, and their radical-cations was investigated by computational methods (BLYP and B3LYP) in the 6-31G* basis set. The reactivity of the propellanes toward model oxidizing electrophiles does not contradict the quantum-chemical calculations. In the case of the tetracyclic framework analog of [3.3.3]propellane the reaction takes place as C—H substitution, whereas in the case of [3.3.2]propellanes it takes place as C—C-oxidative addition. 相似文献
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Convenient syntheses of some bifunctionally substituted [3.3.1] propellanes are reported from the readily accessible tricyclo[4.3.11,6] dec-3-en-8-ol. 相似文献
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Reaction of the bridged annulene derivatives and the dienophile mentioned in the title occurs through attack by the latter from below, anti- to the bridge. The mono-adducts obtained contain a substituted cyclopropane ring. Attempted nucleophilic displacement of suitable substituents was unsuccessful. 相似文献
17.
Pnina Ashkenazi Menachem Kaftory Tuma Sayra Günther Maier David Ginsburg 《Helvetica chimica acta》1983,66(8):2709-2711
Two isomeric propellane epoxides 1a and 1b containing a cyclohexadiene ring are attacked by the title dienophile as predicted, syn to the five-membered ether ring whose α-hydrogens exert less repulsion than the α-epoxy hydrogens or the epoxide oxygen, respectively, of the cyclobutane ring. 相似文献
18.
A. E. Shchekotikhin V. N. Buyanov K. F. Turchin E. P. Baberkina G. V. Avramenko N. N. Suvorov 《Chemistry of Heterocyclic Compounds》1996,32(8):902-906
4,11-Dimethoxynaphtho[2,3-f]indole-5,10-dione and 4-methoxynaphtho[2,3-f[indole-5,10-dione have been synthesized by the Leimgruber-Batcho reaction from 1,4-dimethoxy-2-methyl-3-nitroanthraquinone.Russian University of Chemical Technology, Moscow 125190. Center for Drug Chemistry, All-Russian Scientific Research Institute for Pharmaceutical Chemistry, Moscow 119815. Translated from Khimiya Geterotsklicheskikh Soedinenii, No. 8, pp. 1050–1054, August, 1996. Original article submitted March 20, 1996. 相似文献
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MNDO and STO-3G calculations rationalize the relative instability of the title propellanes vis-à-vis the title products that are formed exclusively. 相似文献