共查询到20条相似文献,搜索用时 0 毫秒
1.
N-Arylsulfonyl-2-halo-1,4-benzoquinone imines react with hydrazoic acid in boiling acetic acid via two pathways: the 1,4-addition and nucleophilic replacement of the halogen atom by an azido group, followed by the 1,4-addition of HN3. In the reaction of N-arylsulfonyl-2,6-dihalo-1,4-benzoquinone imines with hydrazoic acid, both halogen atoms are replaced by azido groups, while N-p-tolylsulfonyl-2-methyl-1,4-benzoquinone imine takes up HN3 molecule according to the 1,4-addition pattern. 相似文献
2.
It was shown that 2-(4-alkylpiperazino)-3-chloro-1,4-naphthoquinones react on heating with NaN3 in DMF to form new heterocyclic quinones — 1,2,3,4-tetrahydro-13-alkyl-3,1-(iminoethano)benzo[g]quinoxaline-5,10-diones as well as the corresponding 2-(4-alkylpiperazino)-3-aminonaphthoquinones and naphthimidazopyrazinediones.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2103–2107, September, 1990. 相似文献
3.
A. P. Avdeenko I. L. Marchenko S. A. Konovalova 《Russian Journal of Organic Chemistry》2001,37(1):72-82
The direction of hydrohalogenation of N-substituted p-quinonimines was predicted on the basis of orbital coefficients of the C2 and C3 atoms in the lowest unoccupied molecular orbital, calculated by the PM3 method. It was assumed that the reaction is orbital-controlled and that the initial act of hydrohalogenation is nucleophilic attack by halide ion. The proposed approach was verified by experimental hydrochlorination and hydrobromination of N-(N-arylsulfonylbenzimidoyl)-1,4-benzoquinonimines which take up HHlg molecule following the 1,4-addition scheme, i.e., the halogen atom adds to C2 of the quinoid ring. 相似文献
4.
A. P. Avdeenko V. V. Pirozhenko L. M. Yagupol''skii I. L. Marchenko 《Russian Journal of Organic Chemistry》2001,37(7):991-1000
Oxidation of N-(N-arylsulfonylimidoyl)-4-aminophenols gave the corresponding N-[N-arylsulfonylimidoyl)-1,4-benzoquinonimines, derivatives of N-aroyl- and N-acetyl-1,4-benzoquinonimines. The structure of the products was studied by the X-ray diffraction method and 1H and 13C NMR spectroscopy. N-(N-Arylsulfonylimidoyl)-1,4-benzoquinonimines were found to undergo fast (on the NMR time scale) Z
E isomerization about the CÍN bond in the quinonimine fragment. N-(N-Arylsulfonylacetimidoyl)-1,4-benzoquinonimines in solution give rise to dynamic Z
E-isomerization with respect to the CÍN bond in the N-arylsulfonylacetimidoyl fragment. 相似文献
5.
A Pd(II)-catalyzed desulfitative arylation protocol between sulfonamides and sodium arylsulfinates was herein reported. The direct arylation reaction was successfully achieved by a Pd(II)/Ag(I)-mediated system without participation of any external ligands with a release of SO2. And different N-aryl sulfonamides were obtained readily in up to 86% yields, exhibiting good functional groups tolerance (25 examples). 相似文献
6.
S. A. Konovalova A. P. Avdeenko V. M. Vasil’eva S. A. Goncharova 《Russian Journal of Organic Chemistry》2014,50(3):351-354
N-Phenyl(benzylidene, phenoxy)acetyl-1,4-benzoquinone imines reacted with sodium azide to give the corresponding 1,4-addition products, N-(4-hydroxyphenyl) carboxamides. Quantum chemical calculations showed that the initial step in the examined reaction is addition of azide ion to neutral quinone imine molecule. 相似文献
7.
S. A. Konovalova A. P. Avdeenko A. G. Sergeeva I. L. Marchenko 《Russian Journal of Organic Chemistry》2014,50(3):346-350
N-Arylcarbamoyl-1,4-benzoquinone imines reacted with sodium azide in completely regioselective fashion according to the 1,4-addition pattern with formation of 1-(3-azido-4-hydroxyphenyl)-3-arylureas. The reaction of N-arylcarbamoyl-2,6-dichloro-3,5-dimethyl-1,4-benzoquinone imines with sodium azide afforded N-arylcarbamoyl-2,6-diazido-3,5-dimethyl-1,4-benzoquinone imines as a result of nucleophilic substitution of the chlorine atoms. 相似文献
8.
A. V. Lis I. P. Tsyrendorzhieva A. I. Albanov V. I. Rakhlin 《Russian Chemical Bulletin》2016,65(2):592-594
A reaction of sodium bis(trimethylsilyl)amide with 2-bromopyridine leads to N,N-bis(trimethylsilyl)- and N,3-bis(trimethylsilyl)-2-pyridinamine. 相似文献
9.
用改进的Vilsmeier反应由3位未取代的中氮茚合成了一系列3-硫代甲酰基中氮茚(硫醛),对其在甲醇溶液中哌啶催化下与碘化1,2-二甲基吡啶鎓盐及碘化1,4-二甲基吡啶鎓盐的缩合反应进行研究,高收率地合成了相应含中氮茚环的二甲川菁,产物结构经元素分析、红外光谱、1H谱及质谱确证,并测定了其在固态下的荧光性质.结果表明,所有的化合物发射波长都在400nm以上,有希望成为发光材料. 相似文献
10.
S. A. Konovalova A. P. Avdeenko A. G. Sergeeva Yu. V. Menafova 《Russian Journal of Organic Chemistry》2014,50(9):1292-1300
N-Arylcarbamoyl-1,4-benzoquinone imines possessing at least one free ortho position with respect to the carbonyl carbon atom in the quinoid ring react with sodium arenesulfinates according to the nucleophilic 1,4-addition pattern with complete regioselectivity. If both ortho positions are occupied, the reaction gives a mixture of products where the major ones are 1,6- and 6,1-adducts formed according to the radical ion mechanism. 相似文献
11.
E. V. Rudyakova I. T. Evstaf’eva I. B. Rozentsveig A. N. Mirskova G. G. Levkovskaya 《Russian Journal of Organic Chemistry》2006,42(7):981-985
Hydrolytic transformations of 4-[2,2,2-trichloro-1-(arylsulfonylamino)-and-(ethoxycarbonylamino)ethyl]phenyloxy(or sulfanyl)acetic acids under microwave irradiation in alkaline medium involve both trichloromethyl group and ester fragment to give N-arylsulfonyl-2-[4-carboxymethyloxy(or sulfanyl)phenyl]-2-aminoacetic acids in good yields. Hydrolysis of methyl 4-[2,2,2-trichloro-1-(arylsulfonylamino)ethyl]phenyloxy(or sulfanyl)acetates without microwave activation occurs only at the ester group with quantitative formation of 4-[2,2,2-trichloro-1-(arylsulfonylamino)ethyl]phenyloxy(or sulfanyl) acetic acids. N-[2,2,2-Trichloro-1-(1-naphthyl, 2-furyl, and 1-methylindol-3-yl)ethyl]-4-chlorobenzenesulfonamides in alkaline medium under microwave irradiation were converted in 10–15 min into the corresponding N-(4-chlorophenylsulfonyl)-2-aryl-2-aminoacetic acids in preparative yields. 相似文献
12.
The addition of halogens to N-arylsulfonyl-1,4-benzoquinone imines, which exist in a solution as Z and E isomers, is controlled by the steric factor. Z-E Isomerization strongly affects the stability of cyclohexene structures formed by halogenation of 1,4-benzoquinone imines. The halogenation of N-arylsulfonyl-1,4-benzoquinone imines was found to be accompanied by prototropic rearrangement. 相似文献
13.
S. A. Konovalova A. P. Avdeenko I. L. Marchenko 《Russian Journal of Organic Chemistry》2014,50(7):973-985
N-Arylsulfonyl, N-aroyl, and N-[arylsulfonylimino(phenyl)methyl] derivatives of 1,4-benzoquinone imine reacted with sodium arenesulfinates to give 1,4-, 1,6-, and 6,1-addition products which were formed according to two concurrent paths: direct nucleophilic addition of arenesulfinate anion to neutral quinone imine molecule and radical ion addition of arenesulfinate radical to radical anion derived from quinone imine. 相似文献
14.
A highly efficient palladium-catalyzed direct desulfitative arylation of azoles at C2-position has been developed using sodium arylsulfinates as aryl sources. Azoles including benzoxazoles, benzothiazoles, oxazoles, thiazoles, and 1,3,4-oxadiazoles reacted with sodium arylsulfinates smoothly to generate the corresponding products in good to excellent yields, and various substitution patterns were tolerated toward the reaction. 相似文献
15.
Aliev Z. G. Krasnykh O. P. Maslivets A. N. Atovmyan L. O. 《Russian Chemical Bulletin》2000,49(12):2045-2047
3(Z)-Benzoylmethylidene-6-nitro-3,4-dihydro-2H-1,4-benzooxazin-2-one reacts with (COCl)2 as imino enol rather than enamino ketone. The reaction is accompanied by replacement of the hydroxy group by chlorine. The molecular and crystal structures of the starting 1,4-benzooxazin-2-one and its chlorinated derivative were studied by X-ray diffraction analysis. 相似文献
16.
A. I. Borbov Ya. V. Zachinyaev N. E. Antsiferova A. I. Ginak 《Chemistry of Heterocyclic Compounds》1992,28(1):104-107
The reaction of 2-mercaptobenzimida(thia)zole with 1,4-naphthoquinone proceeds as nucleophilic 1,4-addition to give the corresponding thioethers. The reaction of 1,4-naphthoquinone oxide with 2-mercaptobenzimidazole leads to benzimidazonaphthothiazole, while the reaction of the oxide with 2-mercaptobenzothiazole leads to a thioether as a consequence of the addition of the mercapto-substituted heterocycle at the oxide ring.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 121–124, January, 1992. 相似文献
17.
18.
The Reaction of Triplet 2-Methyl-1,4-Naphthoquinone (Menadione) with DNA and Polynucleotides 总被引:3,自引:0,他引:3
Abstract— The photoreaction of 2-methyl-l,4-naphthoquinone (MQ, menadione) with DNA and polynucleotides in argon-saturated aqueous solution (pH 7) was studied. Results from laser flash photolysis experiments indicate that triplet quinone reacts with DNA and polyA but not detectably with polyU by one-electron oxidation of the bases of the nucleic acid with formation of the radical anion of the quinone. Irradiation of argon-saturated solutions containing MQ and DNA or polynucleotides (polyU, polyA, polyG or polyC) with 334 nm light leads to an increase in molecular weight for single-stranded DNA, polyA and to a much less extent for polyU. This finding indicates crosslink formation with quantum yields in the range of 10−5 -10−3 相似文献
19.
pH-metric studies show that one mole of Eu(III) interacts with three molecules of each of juglone, plumbagin, lawsone and lapachol in solution. The stability and thermodynamics of these systems (50% aqueous acetone, 0.1 M KNO3 ionic strength) are discussed and explained. 相似文献
20.
Conclusions Sodium octahydrotriborate reacts with Cp2ZrCl2 in THF, ether or CH2Cl2 to give Cp2ZrClBH4.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 417–419, February, 1984. 相似文献