共查询到20条相似文献,搜索用时 15 毫秒
1.
Bromination of 3-(3-arylpyrazol-4-yl)acrylic acids led to the formation of 2-bromo-3-(3-arylpyrazol-4-yl)acrylic acids that were converted into 3-(3-arylpyrazol-4-yl)propynoic acids by treatment of potassium hydroxide with an alcoholic solution. 相似文献
2.
3-Aryl-1-phenyl-4-mercaptomethylpyrazoles reacted with monochloroacetic acid to give 3-aryl-1-phenyl-4-pyrazolylmethylsulfanylacetic acids whose oxidation with hydrogen peroxide in acetone or acetic acid solution led to 3-aryl-1-phenyl-4-pyrazolylmethylsulfinyl-and sulfonylacetic acids, respectively. 相似文献
3.
4.
5.
Peruncheralathan S Khan TA Ila H Junjappa H 《The Journal of organic chemistry》2005,70(24):10030-10035
[reaction: see text] Highly efficient and regioselective synthesis of 1-aryl-3,4-substituted/annulated-5-(methylthio)pyrazoles and 1-aryl-3-(methylthio)-4,5-substituted/annulated pyrazoles has been reported via cyclocondensation of arylhydrazines with either alpha-oxoketene dithioacetals or beta-oxodithioesters. 相似文献
6.
7.
M. K. Bratenko V. A. Chornous N. P. Voloshin M. V. Vovk 《Chemistry of Heterocyclic Compounds》1999,35(9):1075-1077
Previously unknown substituted pyrazoles were obtained by the reaction of the 2-cyanoethylhydrazones of aryl methyl ketones and 5-methylfur-2-yl methyl ketone with the Vilsmeier-Haack reagent.Bukovina State Medical Academy, Chernovtsy. Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Kiev, Ukraine. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1219–1221, September, 1999. 相似文献
8.
3-(3-Aryl-4-formyl-1-pyrazolyl)propionic acids are converted by Knoevenagel condensation under conditions of microwave activation
into 3-[3-aryl-1-(2-ethoxycarbonyl)-4-pyrazolyl]acrylic acids. Reduction of the latter with hydrazine hydrate in the presence
of Raney nickel gives 3-[3-aryl-1-(2-ethoxycarbonyl)-4-pyrazolyl]propionic acids.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 686–690, May, 2006. 相似文献
9.
M. L. Purkayastha B. Patro H. Ila H. Junjappa 《Journal of heterocyclic chemistry》1991,28(5):1341-1349
The regioselective synthesis of the title isoxazoles and pyrazoles through cyclocondensation of oxoketene dithioacetals with either hydroxylamine or hydrazine hydrate under controlled conditions is reported. 相似文献
10.
Peruncheralathan S Yadav AK Ila H Junjappa H 《The Journal of organic chemistry》2005,70(23):9644-9647
[Reaction: see text]. An efficient highly regioselective protocol for the synthesis of isomeric 1,3-diaryl (or 1-aryl-3-alkyl) and 1,5-diaryl (or 1-aryl-5-alkyl)-5 (or 3)-(N-cycloamino)pyrazoles has been reported by cyclocondensation of common alpha-oxoketene N,S-acetal precursors with arylhydrazines by variation of reaction conditions. 相似文献
11.
12.
3-(3-Aryl-4-formyl-1-pyrazolyl)propionic acids were synthesized by the reaction of 3-aryl-1-(2-cyanoethyl)-4-formylpyrazoles with concentrated hydrochloric acid. They were converted into the corresponding amides by the carbodiimide method.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1483–1486, October, 2004.For Communication 2, see [1]. 相似文献
13.
M. K. Bratenko O. I. Panimarchuk N. V. Mel’nichenko M. V. Vovk 《Russian Journal of Organic Chemistry》2005,41(2):238-242
By reduction of 3-aryl(heteryl)-1-phenyl-4-azidomethyl-pyrazoles in the presence of Raney nickel or by hydrazinolysis of N-[3-aryl(heteryl)-1-phenyl-4-pyrazolylmethyl]phthalimides 4-pyrazolylmethylamines were obtained that in reaction with bis(trichloromethyl) carbonate afforded 3-aryl-(heteryl)-1-phenyl-4-pyrazolylmethyl isocyanates, and with carbon disulfide furnished 3-aryl-(heteryl)-1-phenyl-4-pyrazolylmethyl isothiocyanates.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 2, 2005, pp. 247–251.Original Russian Text Copyright © 2005 by Bratenko, Panimarchuk, Mel’nichenko, Vovk. 相似文献
14.
15.
E. V. Koroleva Ya. M. Katok T. V. Chernikhova F. A. Lakhvich 《Chemistry of Heterocyclic Compounds》1999,35(2):225-230
The reactions of 3-R-(4-pyridyl)-2-isoxazolines and the products of their hydrogenolysis over Raney Ni/AlCl3 with NaBH4 and KBH(s-Bu)3 as the reducing agents were studied. New polyhydroxyprostanoids were synthesized.Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, 220141 Minsk; Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 252–258, February, 1999. 相似文献
16.
4-(5-Aryl-2-oxazolyl)-substituted phthalic anhydrides were synthesized from 4-chloroformylphthalic anhydride and various -aminomethyl aryl ketones. The spectral-luminescence properties of solutions of the products in toluene and 5% NaOH solution were investigated. It is shown that the introduction of substituents with different electronic natures in the 5-phenyl ring of 4-(5-phenyl-2-oxazolyl) phthalic anhydride has a significant effect on the spectral-luminescence characteristics of the synthesized compounds.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 35–37, January, 1979. 相似文献
17.
Treatment of methyl pyruvate N-arylhydrazones with the Vilsmeier-Haack reagent gave methyl 1-aryl-4-formylpyrazole-3-carboxylates,
basic hydrolysis of which yielded the corresponding acids. 相似文献
18.
1-Aryl-3-(2,4-dimethyl-5-ethoxycarbonyl-3-pyrrolyl)-5-oxopyrazoles were obtained by condensation of ethyl -(2,4-dimethyl-5-ethoxycarbonyl-3-pyrrolyl)--ketopropionate with arylhydrazines. Electron-donor substituants in the aromatic ring of the arylhydrazines accelerate the cyclization of the intermediate hydrazones, whereas electron-acceptor substituents hinder cyclization.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1076–1081, August, 1983. 相似文献
19.
20.
Eduardo Díaz Hctor Barrios Rubn A. Toscano Francisco Yuste William F. Reynolds Jos Luis Aguilera Efrn Caballero 《Journal of heterocyclic chemistry》1992,29(5):1325-1330
The reaction of dibenzalacetones substituted on the aromatic ring with hydroxylamine hydrochloride and potassium hydroxide in refluxing ethanol affords several compounds. Herein, we report the structures and spectral properties of several oximes of 2-(4,5-dihydro-5-aryl-3-isoxazolyl)-1-arylethanones 6 . Unusual behaviour on its 1H-nmr and mass spectra was observed. Single crystal X-ray diffraction was performed on compound 6d to support our structural considerations abouth the title compounds. 相似文献