共查询到20条相似文献,搜索用时 15 毫秒
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V. S. Kochubey Ya. S. Blochin O. G. Rodin V. P. Perevalov 《Chemistry of Heterocyclic Compounds》2006,42(7):897-900
An aza-Wittig reaction has been used for the first time in the synthesis of substituted 2-amino-5,6-dihydropyrimidin-4-ones
via condensation of triphenyliminophosphoranes with aromatic heterocumulenes (arylisocyanates and thiocyanates).
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 1037–1041, July, 2006. 相似文献
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合成了 2 羟基 4 磺酰氨基苯重氮氨基偶氮苯 (HSDAA) ,并研究了在TritonX 1 0 0表面活性剂存在下HSDAA与镉的显色反应。在pH 8 5~ 1 0 5的Na2 B4 O7 NaOH缓冲溶液中 ,该试剂与镉生成 2∶1型深红色配合物。配合物的最大吸收峰位于 5 2 5nm处 ,表观摩尔吸光系数达 1 84× 1 0 5L·mol- 1·cm- 1。ρ(Cd2 + )在 0~ 480 μg/L范围内符合比耳定律。用拟定方法测定样品中的微量镉 ,结果满意。 相似文献
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2-Substituted-2,3-dihydro-4(1H)-quinazolinones were synthesized in high yield by condensation of 2-anthranilamide with aromatic aldehydes or ketones in refluxing water without catalyst.This protocol has advantages of high yield,simple work-up and environmental friendly procedure. 相似文献
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The reaction of 2-amino-2-(trichloromethyl)tetrahydro-4-pyrone-5-spirocyclohexane with ethylenediamine afforded 6-amino-2,3-dihydro-4-pyrone-3-spirocyclohexane, whereas 2-amino-5,5-dimethyl-2-(trichloromethyl)tetrahydro-4-pyrone gave 2-(3-hydroxy-2,2-dimethylpropionylmethylene)imidazolidine in low yield. 相似文献
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Rong Zhang Qiao Bai Ling Xu Yan Hui Wang Department of Life Science Technology Beijing University of Chemical Technology Beijing China Institute of Materia Medica Chinese Academy of Medical Sciences & Peking Union Medical College Beijing China 《中国化学快报》2007,18(6):656-658
2-Substituted-2,3-dihydro-4(1H)-quinazolinones were obtained in high yields by condensation of anthranilamide with aryl, alkyl or heteroaryl aldehydes or ketones in the refluxing 2,2,2-trifluoroethanol without any catalyst. 相似文献
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Gowravaram Sabitha K. Bhaskar Reddy M. Bhikshapathi J.S. Yadav 《Tetrahedron letters》2006,47(16):2807-2810
The Prins-type cyclization of ketones with homoallylic and homopropargylic alcohols in the presence of TMSI generated in situ from TMSCl and NaI produced 2,2-disubstituted- or spirocyclic-4-iodo-tetrahydropyrans and spirocyclic-4-iodo-5,6-dihydro-2H-pyrans in good yields. These iodopyrans are reported for the first time. 相似文献
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I. V. Ukrainets L. V. Sidorenko O. V. Gorokhova E. V. Mospanova O. V. Shishkin 《Chemistry of Heterocyclic Compounds》2006,42(5):631-635
A modified method is proposed for preparation and purification, and the special features of the spatial structure have been
studied for the ethyl ester of 1-hydroxy-3-oxo-5,6-dihydro-3H-pyrrolo[3,2,1-i,j]-quinoline-2-carboxylic acid.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 718–723, May, 2006. 相似文献
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I. V. Ukrainets L. V. Sidorenko L. A. Petrushova O. V. Gorokhova 《Chemistry of Heterocyclic Compounds》2006,42(1):64-69
Several variants were studied for the synthesis of esters of halogen derivatives of 4-hydroxy-2-oxo-1,2-dihydro-3-quinolinecarboxylic
acids, whose reaction with 2-amino-4-methylthiazole gives the corresponding hetarylamides. Results are given for a study of
the antitubercular activity of these products.
Communication 89, see ref. [1].
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 71–76, January, 2006. 相似文献
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Ahmad Shaabani Ali Hossein Rezayan Sabrieh Ghasemi Afshin Sarvary 《Tetrahedron letters》2009,50(13):1456-6112
The zwitterion formed from an alkyl or aryl isocyanide and dialkyl acetylenedicarboxylate reacts with acetic anhydride or phthalic anhydride to form 2,5-dihydro-5-imino-2-methylfuran-3,4-dicarboxylates or benzo-fused spirolactones in relatively good yields at room temperature without using a catalyst. 相似文献
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Koichiro Yonetake Motoo Takahashi Toru Masuko Mitsuru Ueda 《Journal of polymer science. Part A, Polymer chemistry》1998,36(3):413-419
4-Hydroxy-2,3,5,6-tetrafluorobenzoic acid/6-hydroxy-2-naphthoic acid copolymers (FHBA/HNA copolymer) with different copolymer compositions were prepared and the influence of FHBA residue on the thermal properties and structures of the copolymers were investigated. Introduction of FHBA decreased the crystal/nematic phase transition temperatures(TCNs) of the FHBA/HNA copolymers. TCNs of the copolymers were in the temperature range between 200 and 250°C, depending on the copolymer composition. They are approximately 40°C lower than those of 4-hydroxybenzoic acid/HNA copolymers. FHBA/HNA copolymers exhibited low crystallinity, and annealing treatment hardly influenced the crystalline natures. FHBA residue possibly interferes with the recrystallization during annealing. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36 : 413–419, 1998 相似文献
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B. S. Fedorov M. A. Fadeev V. V. Arakcheeva G. V. Strukov N. I. Golovina R. F. Trofimova G. V. Shilov L. O. Atovmyan 《Russian Chemical Bulletin》1994,43(12):2087-2090
A novel heterocyclic compound, 4-acetoxy-5,6-dihydro-5,5-dinitro-2H-1,3-oxazineN-oxide, has been synthesized by the reaction of the dipotassium salt of 1,1,5,5-tetranitro-3-oxapentane with aqueous acetic acid. The synthesized compound has been studied by X-ray diffraction analysis.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2207–2210, December, 1994.We would like to thank G. V. Lagodzinskaya (Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences) for recording and interpreting1H NMR spectra, A. M. Korolev (Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences) for helpful discussion, and V. I. Fetisov (Institute of Physiologically Active Compounds, Russian Academy of Sciences) for performing quantum-chemical calculations by the AM1 SCF MO LCAO method. 相似文献
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报道了2-氨基-6-氟-9-(4-羟基-3-羟甲基丁基)嘌呤(1)的合成, 通过对起始原料2-氨基-6-氯-9-(4-乙酰氧基-3-乙酰氧甲基丁基)嘌呤(2)水解脱去乙酰基, 得到2-氨基-6-氯-9-(4-羟基-3-羟甲基丁基)嘌呤(3). 化合物3与三甲胺乙醇溶液在混合溶剂[V(THF)∶V(DMF)=3∶1]中反应得到相应的氯化铵盐4, 然后与KF在DMF溶剂中反应, 得到化合物1. 产品经UV-vis, IR, 1H NMR, 19F NMR和MS表征. 考察了反应温度、氟化试剂等因素对氟化反应的影响, 为6位含氟的嘌呤核苷类化合物的合成提供了一种直接、简易的新方法. 相似文献
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Xi Ying ZHAO Machiko ONO Hiroyuki AKITA Yu Ming CHI 《中国化学快报》2006,17(6):727-729
( )-(4S,5R)-Osmundalactone 1 was isolated from the fungus Paxillus atrotomentosus (Paxillaceae) by Buchanan1. (-)-(4R,5S)-Osmundalactone 1 and ( )-(4R,5S)-5-hydroxy- 2-hexen-4-olide 2 were isolated from Osmunda japonica (Osmundaceae) as feeding inhibitors… 相似文献
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合成了新的三氮烯试剂2 羟基4 磺酰氨基苯3 (4 硝基苯) 三氮烯(HSNPT) ,并研究了在TritonX 1 0 0表面活性剂存在下与镍的显色反应。在pH 1 0~1 2. 0的Na2 B4 O7 NaOH缓冲溶液中,试剂与镍形成配合比为3∶1型淡黄色配合物。配合物最大负吸收峰位于λ=5 40nm处,表观摩尔吸光系数1 .1 8×1 0 5L·mol- 1·cm- 1。Ni2 +的质量浓度在0~480 μg/L范围内符合比尔定律。用拟定方法测定合金钢样品中的微量镍,结果满意。 相似文献
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Tetsuro Shimo 《Tetrahedron》2005,61(33):8059-8064
Solid-state photosensitized reactions of 4-acyloxy-2-pyrones (1b,c) with maleimide (2) afforded endo-endo double-[4+2] cycloadducts (3b,c) with high stereoselectivity. Sensitized photoreactions of 1a-d with 2 in solution gave exo-endo double-[4+2] cycloadducts (4a-d). 2-Pyrones 1a-d were photolyzed to give carboxylic acids (5a-d) via their valence isomerization in the solid state and in solution. Such kinds of photoreaction of the 4-acyloxy-2-pyrones were dramatically different from regio- and stereoselective [2+2] cycloadditions of 4-alkyloxy-2-pyrones. The photoreaction mechanisms of 1 with 2 and 1 itself were analyzed by powder X-ray diffraction analysis and MO calculations. 相似文献
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I. V. Ukrainets L. V. Sidorenko O. V. Gorokhova O. V. Shishkin 《Chemistry of Heterocyclic Compounds》2006,42(2):191-196
The reaction of ethyl aminocrotonates with derivatives of malonic acid is a suitable method for the preparation of ethyl 4-hydroxy-6-methyl-2-oxo-1,2-dihydropyridine-5-carboxylates.
One of the synthesized materials has been studied by X-ray crystallography.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, 217–223, February, 2006. 相似文献
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S. G. Taran I. V. Ukrainets L. V. Sidorenko O. V. Gorokhova N. A. Jaradat 《Chemistry of Heterocyclic Compounds》2000,36(8):944-947
Treatment of 1-R-2-oxo-4-hydroxyquinolin-3-ylamides of -halogen-substituted carboxylic acids with sodium methoxide leads to the formation of 2-R-3-oxomorpholino-[5,6-c]-6-R-quinolin-5-ones. The antituberculosis activity of the compounds synthesized was studied.For Communication 43, see [1].National Pharmaceutical Academy of Ukraine, Kharkov 310002; e-mail: igor@uiv.kharkov.ua. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1080–1083, August, 2000. 相似文献