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Klaus Mandelt 《Tetrahedron》2004,60(50):11587-11595
Several new Grignard reagents based on substituted cyclobutanes have been generated and added to cyclobutanones to yield mono- to trimethylated [1,1′-bicyclobutyl]-1-ols. Mono- to trimethylated spiro[3.4]octan-5-ols have been prepared from the parent ketone via alkylation and/or addition reactions. Upon treatment with acid, all [1,1′-bicyclobutyl]-1-ols and spiro[3.4]octan-5-ols rearrange to yield a single bicyclo[3.3.0]octene. 相似文献
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V. M. Kisel E. O. Kostyrko V. A. Kovtunenko 《Chemistry of Heterocyclic Compounds》2002,38(9):1130-1133
We propose a convenient preparative method for synthesis of derivatives of novel heterospirane systems with a benzo[5,6][1,2,4]thiadiazino[4,3-b]isoquinoline ring, based on the reaction of 1-(2-bromomethylphenyl)-1-cyclopentanecarbonitrile and 4-(2-bromomethylphenyl)-3,4,5,6-tetrahydro-2H-pyran-4-carbonitrile with o-aminobenzenesulfamide. 相似文献
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Janusz Jamrozik 《Monatshefte für Chemie / Chemical Monthly》1985,116(2):229-235
3,6,10,13-Tetrathia[6.6.1]propellane (1) has been prepared by two independent syntheses.1 exists as an equilibrium of two conformers with C2 and Cs symmetry, respectively. The heterocyclic rings adopt a twist-tub conformation. The multistage synthesis of1 makes also 1,5-cyclooctadiene (5) accessible, as the result of [4s+4s]-cycloaddition. The formation of [6.6.1]propellanes of the isomeric [6.0.6.1]dispiranes depends on the nature of the hetero atom. 相似文献
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V. M. Kisel E. O. Kostyrko O. V. Shishkin S. V. Shishkina V. A. Kovtunenko 《Chemistry of Heterocyclic Compounds》2002,38(10):1253-1262
Condensation of o-bromomethylphenylacetonitrile with arylcarbohydrazides gave, depending on the reaction conditions, 2-arylcarboxamido-1,4-dihydroisoquinoline-3(2H)-imine hydrobromides or 2-aryl-5,10-dihydro[1,2,4]triazolo[1,5-b]isoquinolines. Analogous condensation of 4-(2-bromomethylphenyl)tetrahydro-2H-pyran-4-carbonitrile and 1-(2-bromomethylphenyl)-1-cyclopentanecarbonitrile with arylcarbohydrazides gave respectively 2-aryl-2,3,5,6-tetrahydrospiro[4H-pyran-4,10'(5'H)-[1,2,4]triazolo[1,5-b]isoquinolines and 2-arylspiro[1,2,4]triazolo[1,5,b]isoquinoline-10(5'H)-1'-cyclopentanes, derivatives of new spirane heterocycles. The reaction with condensing agents of 3-imino-2,2',3,3'5',6'-hexahydrospiro[isoquinoline-4(1H),4'-4H-pyran]-2-amine and 3-imino-2,3-dihydrospiro[isoquinoline-4(1H),1'-cyclopentane]-2-amine hydrobromides, synthesized from the corresponding bromo nitriles and hydrazine, may serve as an alternative route for the synthesis of these compounds. The structure of obtained triazoloisoquinolines was established from IR, 1H and 13C NMR spectra. An X-ray crystallographic study of 2-phenylspiro[1,2,4]triazolo[1,5-b]isoquinoline-10(5H),1'-cyclopentane was carried out. 相似文献
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Using the system of tetracyanoethylene, ammonium acetate and a carbonyl compound, the preparation of 2-[5-amino-2,3-dihydro-4H-imidazol-4-ylidene]malononitriles was carried out. The structures of these new dihydroimidazoles were determined by NMR experiments and by X-ray crystallography. 相似文献
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Synthesis of Boronate‐Based Benzo[fg]tetracene and Benzo[hi]hexacene via Demethylative Direct Borylation 下载免费PDF全文
Misa Numano Naoto Nagami Soichiro Nakatsuka Takazumi Katayama Kiichi Nakajima Sou Tatsumi Dr. Nobuhiro Yasuda Prof. Dr. Takuji Hatakeyama 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(33):11574-11577
A demethylative direct borylation is reported, which was applied to the synthesis of benzo[fg]tetracenes containing boronate ester, amide, and thioester substructures. Depending on the heteroatom adjacent to boron, the molecules showed characteristic photophysical properties, molecular arrangements, and chemical stabilities. The key to the successful synthesis is the appropriate choice of the boron source and Brønsted base. The versatility of the direct borylation was demonstrated by the synthesis of a boronate‐based benzo[hi]hexacene. 相似文献
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Oleg KasyanDariusz Swierczynski Andrew DrapailoKinga Suwinska Janusz LipkowskiVitaly Kalchenko 《Tetrahedron letters》2003,44(38):7167-7170
The synthesis and structure of new tetrahydroxythiacalix[4]arenes, existing in the cone conformation and possessing reactive bromide, chloromethyl or diorganylphosphoryl groups on the upper rim of the macrocycle are described. The molecular structure of tetrakis(diisopropoxyphosphorylmethyl)thiacalix[4]arene was examined by X-ray crystallography. 相似文献
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Kawase T Fujiwara N Tsutumi M Oda M Maeda Y Wakahara T Akasaka T 《Angewandte Chemie (International ed. in English)》2004,43(38):5060-5062