共查询到20条相似文献,搜索用时 15 毫秒
1.
A. Ya. Yakubovskaya T. Yu. Kochergina V. A. Denisenko D. V. Berdyshev V. P. Glazunov V. Ph. Anufriev 《Russian Chemical Bulletin》2006,55(2):301-305
2,3-Dihydro-3-O-(1,4-naphthoquinon-2-yl)-2-oxo-1,4-naphthoquinones are the products of oxidative coupling of substituted 2-hydroxy-1,4-naphthoquinones
(regardless of the presence of peri-hydroxy groups in their structures) under the action of lead dioxide.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 294—298, February, 2006. 相似文献
2.
V. N. Britsun A. N. Borisevich L. S. Samoylenko A. N. Chernega M. O. Lozynskii 《Russian Chemical Bulletin》2005,54(3):770-773
Oxalylation of 3-oxo-N-phenyl-3-R-propanethioamides in aprotic solvents in the temperature range from −40°C to +20°C results in 4-acyl-5-phenylamino-2,3-dihydrothiophene-2,3-diones and 2-(2-oxo-2-R-ethylidene)-3-phenyl-1,3-thiazolidine-4,5-diones, while in the presence of potassium carbonate, potassium 4-acyl-2,3-dioxo-1-phenyl-2,3-dihydro-1H-pyrrole-5-thiolates are formed.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 757-760, March, 2005. 相似文献
3.
G. V. Malinovskaya A. Ya. Chizhova V. Ph. Anufriev V. P. Glazunov V. A. Denisenko 《Russian Chemical Bulletin》1999,48(8):1587-1589
Based on IR and1H and13C NMR spectroscopic studies, the oxidation product of echinochrome with Ag2O was assigned the structure of 2,3-epoxy-7-ethyl-2,3-dihydro-2,3,5,6,8-pentahydroxy-1,4-naphthoquinone.
For part 4, see Ref. 1.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1607–1609, August, 1999. 相似文献
4.
It has been found that malonodinitrile and 2-(6-R1-oxo-3,4-dihydro-2-quinazolyl)acetonitrile in the presence of triethylamine undergo hetarylation by 5,6-dichloro-2,3-pyrazinedicarbonitrile at the active methylene group to give the triethylammonium salt of 2-(3-chloro-5,6-dicyano-2-pyrazinyl)malononitrile or 5-chloro-6-cyano(6-R1-4-oxo-1,2,3,4-tetrahydro-2-quinazolylidene)methyl-2,3-pyrazinedicarbonitriles. Reaction of these with primary amines leads to annelation of the pyrrole ring at the pyrazine [b] edge to give 6-amino-5-R-5H-pyrrolo[2,3-b]pyrazine-2,3,7-tricarbonitriles and 6-amino-5-R2-7-(6-R1-4-oxo-3,4-dihydro-2-quinazolyl)-5H-pyrrolo[2,3-b]pyrazine-2,3-dicarbonitriles respectively. 相似文献
5.
Z. G. Aliev S. N. Shurov E. Yu. Pavlova Yu. S. Andreichikov L. O. Atovmyan 《Russian Chemical Bulletin》1995,44(8):1492-1495
Reaction of 5-phenyl-2,3-dihydro-2,3-furandione with ethyl 3-benzylamino-2-butenoate, resulting in ethyl 1-benzyl-2-hydroxy-5-methyl-3-oxo-2-phenacyl-2,3-dihydropyrrole-4-carboxylate and benzylamide ofN-benzoylpyruvic acid, was studied. The structure of the pyrrole derivative was confirmed by X-ray analysis.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1552–1555, August, 1995. 相似文献
6.
A synthesis of novel derivatives of 6-methyluracil, 6-methyl-2-thioxo-, and 2-imino-6-methyl-2,3-dihydro-1H-pyrimidin-4-one
containing a 2-(phenoxy)ethyl substituent at position 5 of the pyrimidine ring has been carried out. It was found that 5-[2-(phenoxy)ethyl]
derivatives of 6-methyl-2-thioxo- and 2-imino-6-methyl-2,3-dihydro-1H-pyrimidin-4-one are obtained by the condensation of
the corresponding ethyl 3-oxo-2-(2-phenoxyethyl)butanoates with thiourea or guanidine. 6-Methyl-5-[2-(phenoxy)ethyl]uracils
can be prepared by treating 6-methyl-5-[2-(phenoxy)ethyl]-2-thioxo-2,3-dihydro-1H-pyrimidin-4-ones with an excess of aqueous
monochloroacetic acid solution.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1213–1217, August, 2005. 相似文献
7.
The novel substituted 2,3-dichloro-1,4-naphthoquinone derivatives were synthesized from the reactions of (1) and related nucleophilles in sodium carbonate (Na2CO3) solution of ethanol, chloroform with Et3N, or potassium carbonate (K2CO3) solution of acetonitrile. The structures of novel compounds were characterized by using microanalysis, Fourier transform–infrared, 1H NMR, 13C NMR, mass spectrometry, and cyclic voltammetry (CV).
[Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resource(s): Full experimental and spectral details.] 相似文献
8.
R. V. Pisarev V. V. Kalashnikov A. I. Kotov E. B. Yagubskii 《Russian Chemical Bulletin》1996,45(3):735-736
[2+4[-Cycloaddition of 2,3-dihydro-1,4-dithiine and oligomeric 1,3-dithiol-2,4,5-trithione results in the formation of 4a,6,7,8a-tetrahydro-1,3-dithiolo[4',5':5,61-[1,4[dithiino[2,3-b[1,4-dithiine-2-thione, which is a precursor for synthesis of new organic rz-donors.Translated fromIzvestiya Akademi Nauk Seriya Khimicheskaya No. 3, pp. 775–776, March, 1996. 相似文献
9.
N. M. Igidov E. N. Kozminykh G. A. Shavkunova V. O. Kozminykh E. S. Berezina 《Russian Chemical Bulletin》1995,44(2):322-325
Diphenylketene undergoes regioselective thermal [2+2]-cycloaddition to the heterocyclic C(3)=O carbonyl group of 5-aryl-2-methoxycarbonylmethylene-2,3-dihydrofuran-3-ones and 5-phenyl-2,3-dihydrofuran-2,3-dione to give the corresponding 3-diphenylmethylene derivatives of 2,3-dihydrofuran.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 331–334, February, 1995. 相似文献
10.
When treated with an excess of MeONa in DMF, 5-benzylsulfonyl-3-chloro-4-methoxycarbonylaminoisothiazole undergoes cyclization into 3-methoxy-5-oxo-6-phenyl-5,6-dihydro-4H-isothiazolo[5,4-b]-1,4-thiazine 7,7-dioxide, the first representative of a new heterocyclic system. The starting 5-benzylsulfonyl-3-chloro-4-methoxycarbonylaminoisothiazole was prepared by the reaction of 5-benzylsulfonyl-4-carbamoyl-3-chloroisothiazole with PhI(OAc)2 in methanol. 相似文献
11.
Kazuhiro Kobayashi Natsuki Konishi Teruhiko Suzuki Kazuhiro Nakagawa 《Helvetica chimica acta》2013,96(8):1452-1456
An efficient one‐pot synthesis of novel heterocyclic derivatives, 2‐aryl‐1,4‐oxathiino[2,3‐b]quinoxalines or ‐pyrazines 5 , via the reaction of 2,3‐dichloroquinoxaline or ‐pyrazine with Na2S?9 H2O, and subsequent treatment of the resulting 2‐chloro‐3‐sodiosulfanylquinoxaline or ‐pyrazine 2 with 1‐aryl‐2‐bromo‐1‐alkanones and then NaH under mild conditions is described. 相似文献
12.
Summary The syntheses of 2-acetyl-, 2-benzyl-, and 2-ethyl-thieno-diltiazem derivatives are described starting from the corresponding 5-substituted 3-nitro-2-thiophenthiolvia reaction with racemic methyltrans-3-(4-methoxyphenyl)-glycidate under different conditions (solvent, catalyst, temperature) to obtain purethreo orerythro products. The nitro groups of these products were reduced and the resulting amino esters cyclized. The thieno[2,3-b][1,4]thiazepin-5(4H)-ones were N-alkylated and acetylated in position 3. The desired 2-substituted 4-(2-dimethylaminoethyl)-4,5,6,7-tetrahydro-7-(4-methoxyphenyl)-5-oxothieno[2,3-b][1,4]thiazepin-6-yl acetates were isolated in good yields. 相似文献
13.
A method was developed for the synthesis of 2-oxo-4-phenyl-2,3-dihydro-9H-pyrimido[4,5-b]indole as well as of 2-chloro- and 2-nitramino-4-phenylpyrimido[4,5-b]indoles. The replacement of the chlorine atom in 2-chloropyrimidoindole gave rise to a number of its functional derivatives (morpholino, azido, and cyano). The reaction of 2-chloro-substituted pyrimidoindole with hydrazine hydrate and catalytic hydrogenation of 2-nitraminopyrimidoindole were studied. 相似文献
14.
E. A. Kaigorodova L. D. Konyushkin M. E. Niyazymbetov S. N. Kvak V. N. Zaplishny V. P. Litvinov 《Russian Chemical Bulletin》1994,43(12):2095-2099
A series of substituted 2-alkyl(aryl-, hetaryl-)thiopyridines was prepared by cathodic electrolysis of thiols in the presence of 2-chloro-3-cyano-4-methoxymethyl-6-methylpyridine or 4-chloro-6-methyl-3-oxo-1H-furo[3,4-c]pyridine. The reaction of 3-cyano-4-methoxymethyl-6-methyl-2(1H)-thiopyridone with alkyl halides in the presence of KOH is regioselective and leads toS-alkyl derivatives. The advantages of electrosynthesis for the preparation of 2-alkylthiopyridines fused with 2(5H)-furanone and of 3-aminothieno [2,3-b]pyridines is demonstrated.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2215–2219, December, 1994. 相似文献
15.
V. V. Bolotov S. N. Kovalenko S. V. Kovaleva V. I. Stepanenko 《Chemistry of Heterocyclic Compounds》2004,40(2):211-213
A method is presented for the synthesis of 3-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)-1,4-dihydroquinoxalin-2-one and 2-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)-2H-1,4-benzoxazin-3(4H)-one by the reaction of ethyl 2-oxoindoline-2-glyoxylate with o-aminophenol and o-phenylenediamine. Proposed reaction mechanisms are presented. 相似文献
16.
S. V. Volkov A. N. Levov A. T. Soldatenkov N. M. Kolyadina O. E. Volkova V. N. Khrustalev 《Chemistry of Heterocyclic Compounds》2007,43(9):1181-1188
The 4-nitro derivatives and an oxidation by-product, 9-hydroxy-2-methyl-3-oxo-9-phenyl-2,3-dihydro-9H-indeno[2,1-c]pyridine
were obtained by the nitration of N-alkyl-9-phenyl-2,3-dihydro-1H-indeno-[2,1-c]pyridines with sodium nitrite in acetic acid.
Their molecular structures were studied by X-ray structural analysis. The product of [2+3] cycloaddition, 5-methyl-3,7-diphenyl-3a,
4,5,6-tetrahydroindeno[2,1-c]isoxazolo[5,4-d]pyridine, was obtained by the interaction of 2-chloro-1-hydroxy-2-phenylazomethine
with 2-methyl-9-phenyl-2,3-dihydro-1H-indeno[2,1-c]pyridine.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1390–1399, September, 2007. 相似文献
17.
Summary The reaction of 3-iodo-4-methoxy-2(1H)-quinolinone (1) and 3-iodo-4,6,8-trimethoxy-2(1H)-quinolinone (2) with 2-methyl-3-butyn-2-ol under modified Heck-conditions gave the 2-substituted derivatives 2-(1-hydroxy-1-methylethyl)-4-methoxyfuro[2,3-b]-quinoline (3) and 2-(1-hydroxy-1-methylethyl-4,6,8-trimethoxyfuro[2,3-b]-quinoline (4). By a subsequent hydrogenation-reaction with a homogeneous catalyst (PtO2/Rh2O3), the furoquinoline-derivatives yielded the dihydrofuro-[2,3-b]quinolines, identified as 2-(1-hydroxy-1-methylethyl-4-methoxy-2,3-dihydrofuro[2,3-b]quinoline (5) (racemic platydesmine) and 2-(1-hydroxy-1-methylethyl)-4,6,8-trimethoxy-2,3-dihydrofuro-[2,3-b]quinoline (6) (racemic precursor of O4-methylptelefolonium salt). 相似文献
18.
E. N. Kozminykh N. M. Igidov G. A. Shavkunova V. O. Kozminykh 《Russian Chemical Bulletin》1997,46(7):1285-1290
2-p-Chlorobenzoylmethylene-5-phenyl-2,3-dihydro-3-furanone reacts with arylamines orN-arylideneamines to form the products of ring opening, 1,6-diaryl-1-arylamino-4-hydroxy-1,4-hexadiene-3,6-diones. The reaction
of 5-aryl-2-p-chlorobenzoylmethylene-2,3-dihydro-3-furanones witho-aminophenol afforded 3-p-chlorobenzoylmethylene-3,4-dihydro-2H-benzo[b]-1,4-oxazin-2-one. Nucleophilic attack of amines is directed either to electrophilic centers at the C(5) and C(2) atoms or
to the carbonyl group of the 2-phenacylidene substituent of the 3-oxofuran ring.
For communication 15, see Ref. 1.
Translated fromIzestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1340–1345, July, 1997. 相似文献
19.
Z. G. Aliev N. Yu. Lisovenko L. O. Atovmyan A. N. Maslivetz 《Journal of Structural Chemistry》2004,45(3):527-531
The interaction of 5-aryl-4-quinoxaline-2,3-dihydro-2,3-furandiones with mesitylamine and methyl(phenyl) hydrazine results in the formation of 1-substituted 5-aryl-4-quinoxalinyl-2,3-dihydro-2,3-pyrrolediones. The crystal and molecular structure of the 1-mesityl-5-phenyl derivative was investigated by X-ray diffraction.Original Russian Text Copyright © 2004 by Z. G. Aliev, N. Yu. Lisovenko, L. O. Atovmyan, and A. N. MaslivetzTranslated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 3, pp. 553–557, May–June 2004. 相似文献
20.
Kazuhiro Kobayashi Kota Matsumoto Daizo Nakamura Shuhei Fukamachi Hisatoshi Konishi 《Helvetica chimica acta》2010,93(6):1048-1051
A facile method for the synthesis of 2,3‐dihydro‐3‐methylidene‐1H‐isoindol‐1‐one and its derivatives carrying substituent(s) at C(5) and/or C(6) has been developed. The reaction of 2‐formylbenzonitrile ( 1a ) with dimethyloxosulfonium methylide, generated by the treatment of trimethylsulfoxonium iodide with NaH in DMSO/THF at 0°, resulted in the formation of 2,3‐dihydro‐3‐methylidene‐1H‐isoindol‐1‐one ( 2a ) in 77% yield. Similarly, six 2‐formylbenzonitriles carrying substituent(s) at C(4) and/or C(5), i.e., 1b – 1g , also gave the corresponding expected products 2b – 2g in comparable yields. 相似文献