共查询到20条相似文献,搜索用时 47 毫秒
1.
I. Strakova A. Strakovs M. Petrova S. Belyakov 《Chemistry of Heterocyclic Compounds》2009,45(11):1319-1324
The interaction of 4-hydroxycoumarin with phenyl-, 2-chlorophenyl- and 4-bromophenyhydrazine hydrochlorides in the presence
of triethylamine led in all cases to the corresponding 4-(arylhydrazino)-coumarins and 1-aryl-3-(2-hydroxyphenyl)-2H-pyrazolin-5-ones.
4-(Arylhydrazino)coumarins reacted with 4-chlorobenzaldehyde in the presence of piperidine acetate to give the corresponding
2-aryl-3-(4-chlorophenyl)[1]benzopyrano[4,3-b]pyrazol-4-ones. The reaction of 4-(4-bromophenylhydrazino)-coumarin with 4-chlorobenzaldehyde in the presence of piperidine
acetate and an excess of piperidine gave 2-(4-bromophenyl)-5-(4-chlorophenyl)-3-(2-hydroxyphenyl)-4-(piperidinocarbonyl)pyrazole,
but the reaction of phenyl- and 4-(2-chlorophenylhydrazino)coumarins with 4-chlorobenzaldehyde gave 1-aryl-5-(4-chlorophenyl)-3-(2-hydroxyphenyl)-4-(1-piperidino)carbonyl-4,5-dihydropyrazoles. 相似文献
2.
Ihsan Ullah Muhammad Sher Rasheed Ahmad Khera Muhammad Farooq Ibad Christine Fischer 《Tetrahedron》2010,66(10):1874-1884
The [3+3] cyclization of 1,3-bis(silyloxy)-1,3-butadienes with 1-hydroxy-5-silyloxy-hex-4-en-3-ones resulted in the one-pot formation of 3-aryl-3,4-dihydroisocoumarins. The reactions proceeded by regioselective cyclization to give 6-(2-aryl-2-chloroethyl)salicylates, which underwent a silica gel-mediated lactonization. The cyclizations of protected 1-amino-5-silyloxy-hex-4-en-3-ones proved to be not regioselective. 相似文献
3.
M. N. Armisheva N. A. Kornienko V. L. Gein M. I. Vakhrin 《Russian Journal of General Chemistry》2011,81(9):1893-1895
The reaction of 5-(4-chlorophenyl)-4-benzoyl-1-(4-hydroxyphenyl)-3-hydroxy-3-pyrrolin-2-one with aromatic amines affords the
corresponding 3-arylamino derivatives, and the reactions of 5-aryl-4-acetyl-1-(4-hydroxyphenyl)-3-hydroxy-3-pyrrolin-2-ones
with p-toluidine yield 5-aryl-4-(1-p-tolylamino)ethylene-1-(4-hydroxyphenyl)pyrrolidin-2,3-diones. 相似文献
4.
Sakram Boda Ravi Dharavath Raghupathi Mutyala Kumar Boda Sathish Anantha Lakshmi P. V. 《Research on Chemical Intermediates》2019,45(4):2007-2022
Research on Chemical Intermediates - The synthesis of 4-aryl-2-(3-(2-(trifluoromethyl)phenyl)-1,8-naphthyridin-2-yl)phthalazin-1(2H)-ones was performed by cyclization of... 相似文献
5.
Yu. M. Volovenko T. A. Volovnenko A. V. Tverdokhlebov I. G. Ryabokon' 《Russian Journal of Organic Chemistry》2001,37(9):1323-1329
Reactions of 2-(4-aryl-1,3-thiazol-2-yl)-3-oxo-4-chlorobutyronitriles with primary aromatic amines result in nucleophilic substitution of the chlorine atom by amino group, followed by intramolecular addition of the secondary amino group to the cyano group. The products are 5-amino-1-aryl-4-(4-aryl-1,3-thiazol-2-yl)- 2,3-dihydro-1H-pyrrol-3-ones which are structurally related to the known antiischemic drugs. 相似文献
6.
V. L. Gein O. V. Bobrovskaya K. A. Tkachenko L. F. Gein 《Russian Journal of General Chemistry》2014,84(7):1349-1352
Depending on the reaction condition, 1-(4-aminosulfonylphenyl)-5-aryl-4-aroyl-3-hydroxy-3-pyrrolin-2-ones reacted with aromatic amines to yield 3-arylamino-3-pyrrolin-2-ones or 4-[aryl (arylamino) methylene]tetrahydropyrrole-2,3-diones. Reactions of 1-(4-aminosulfonylphenyl)-5-aryl-4-aroyl-3-hydroxy-3-pyrrolin-2-ones with hydrazine hydrate afforded pyrrolo[3,4-c]pyrazol-6-ones. 相似文献
7.
4-Alkyl- and 4-aryl-6-(perfluoroalkyl)salicylic acid derivatives were regioselectively prepared by [3+3] cyclization of 1,3-bis(silyl enol ethers) with 3-silyloxy-1-(perfluoroalkyl)prop-2-en-1-ones. 相似文献
8.
A. A. Dudinov S. A. Woznesensky M. I. Struchkova L. I. Belen'kii M. M. Krayushkin 《Russian Chemical Bulletin》2000,49(5):954-955
Heating 1-aryl-5,5-dichloropenta-2,4-dien-1-ones with 4-bromophenacylpyridinium bromide in AcOH in the presence of AcONH4 gave 2-aryl-6-(4-bromophenyl)-4-(2,2-dichlorovinyl)pyridines. The reaction products were structurally characterized by1H and13C NMR spectroscopy.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 955–957, May, 2000. 相似文献
9.
Aromatic hydrazides reacted with 4-aryl-2-hydroxy-4-oxobut-2-enoic and 2-hydroxy-5,5-dimethyl- 4-oxohex-2-enoic acids to give 4-aryl-2-(2-aroylhydrazinylidene)-4-oxobutanoic and 5,5-dimethyl-2-(aroylhydrazinylidene)- 4-oxohexanoic acids. The products were found to exist in solution as mixtures of Z/E-hydrazinylidene and cyclic dihydropyrazole tautomers, and they underwent intramolecular cyclization to 5-aryland 5-tert-butyl-3-(aroylhydrazinylidene)furan-2(3H)-ones by the action of acetic anhydride. 相似文献
10.
I. Yu. Danilyuk R. I. Vas’kevich A. I. Vas’kevich M. V. Vovk 《Russian Journal of Organic Chemistry》2016,52(7):987-992
Intramolecular cyclization of 4-aryl-N-(thiophen-3-yl)but-3-enamides on heating in polyphosphoric acid afforded 8-aryl-4,6,7,8-tetrahydro-5H-thieno[3,2-b]azepin-5-ones and 5-aryl-1-(thiophen-3-yl)pyrrolidin-2-ones. Cyclofunctionalization of the title compounds with (chlorosulfanyl)benzene and 4-(chlorosulfanyl)-toluene led to the formation of 8-aryl-7-arylsulfanyl-4,6,7,8-tetrahydro-5H-thieno[3,2-b]azepin-5-ones or their mixtures with 5-aryl-4-arylsulfanyltetrahydrofuran-2-ones. 1-(Chlorosulfanyl)-4-nitrobenzene reacted with 4-(4-methylphenyl)-N-(thiophen-3-yl)but-3-enamide and 4-(4-fluorophenyl)-N-(thiophen-3-yl)but-3-enamide to give 5-(4-methylphenyl)-4-(4-nitrophenylsulfanyl)-1-(thiophen-3-yl)pyrrolidin-2-one and 5-(4-fluorophenyl)-4-(4-nitrophenylsulfanyl)tetrahydrofuran-2-one, respectively. 相似文献
11.
V. M. Prokopenko S. G. Pil’o V. S. Brovarets A. N. Vasilenko B. S. Drach 《Russian Journal of General Chemistry》2010,80(1):121-126
Reactions of multicenter electrophilic substrates, 2-aryl-4-dichloromethylidene-1,3-oxazol-5(4H)-ones, with 2-aminopyridine, involved cleavage of the dihydrooxazole ring by the primary amino group of nucleophilic reagent
and subsequent cyclization to imidazopyridine derivatives. The latter reacted with morpholine and its analogs via recyclization
with formation of 5-amino-2-aryl-N-(pyridin-2-yl)-1,3-oxazole-4-carboxamides. 相似文献
12.
The [3+3] cyclization of 1,3-bis(silyloxy)-1,3-butadienes with 1-hydroxy-5-silyloxy-4-en-3-ones afforded 6-(2-aryl-2-chloroethyl)salicylates, which were transformed into 3-aryl-3,4-dihydroisocoumarins by silica gel-mediated lactonization. 相似文献
13.
4-Acetyl- and 4-succinyl-3-(2-aryl-2-oxoethyl)-3,4-dihydroquinoxalin-2(1H)-ones undergo the rearrangement into (Z)-2-(3-arylquinoxalin-2-ylidene)acetic acids accompanied by the elimination of the acyl groups. The nitration of 3-(2-oxo-2-phenylethyl)-3,4-dihydro-quinoxalin-2(1H)-one affords 5-nitro- and 7-nitro-2-carboxymethylidenequinoxalines. The bromination of quinoxalin-2-ones in AcOH gives 3-aryl-2-carboxymethylidenequinoxalines
and the corresponding 7-bromo derivatives, with the former products predominating. 相似文献
14.
Gupton JT Telang N Banner EJ Kluball EJ Hall KE Finzel KL Jia X Bates SR Welden RS Giglio BC Eaton JE Barelli PJ Firich LT Stafford JA Coppock MB Worrall EF Kanters RP Keertikar K Osterman R 《Tetrahedron》2010,66(47):9113-9122
Studies directed at the synthesis of (Z)-5-benzylidene-4-arylpyrrol-2(5H)-ones from (Z)-3-aryl-3-haloenoic acids are described. The successful strategy relies on the preparation of (Z)-3-aryl-3-haloenoic acids from acetophenones through the corresponding (Z)-3-aryl-3-haloenals and the conversion of the (Z)-3-aryl-3-haloenoic acids to (Z)-5-benzylidene-4-aryl-5H-furan-2-ones. The furanones were subsequently treated with primary amines and dehydrated to the corresponding (Z)-5-benzylidene-4-arylpyrrol-2(5H)-ones. 相似文献
15.
Kiran S. Hon Hemantkumar N. Akolkar Bhausaheb K. Karale 《Journal of heterocyclic chemistry》2020,57(4):1692-1697
Novel 1-benzyl-3-(4-fluorophenyl)-1H-pyrazole-4-carbaldehydes 3a to 3e were synthesized via Vilsmeier-Haack reaction of the appropriate 1-benzyl-2-(1-(4-fluorophenyl)ethylidene)hydrazines, derived from 4-fluoroacetophenone 1 with substituted 2-benzylhydrazines 2a to 2e . The base catalyzed condensation of 1-benzyl-3-(4-fluorophenyl)-1H-pyrazole-4-carbaldehydes 3a to 3e with 1-(4-fluoro-2-hydroxyphenyl)ethanone 4 gave (E)-3-(1-benzyl-3-(4-fluorophenyl)-1H-pyrazol-4-yl)-1-(4-fluoro-2-hydroxyphenyl)prop-2-en-1-ones 5a to 5e . On cyclization with dimethyl sulfoxide (DMSO)/I2, compounds 5a to 5e gave 2-(1-benzyl-3-(4-fluorophenyl)-1H-pyrazol-4-yl)-7-fluoro-4H-chromen-4-ones 6a to 6e . Structures of all novel compounds were confirmed by infrared (IR), proton nuclear magnetic resonance (1H NMR), carbon nuclear magnetic resonance (13C NMR), and mass spectral data. All the synthesized compounds were screened for their antibacterial activities. 相似文献
16.
Antimony trichloride is an efficient catalyst for the cyclization of 2-amino chalcones to the corresponding 2-aryl-2,3-dihydroquinolin-4(1H)-ones under mild reaction conditions and in almost quantitative yields. 相似文献
17.
Britsun V. N. Esipenko A. N. Kudryavtsev A. A. Lozinskii M. O. 《Russian Journal of Organic Chemistry》2004,40(2):232-238
A new procedure for preparation of 2-R-5-aryl-5,6-dihydro-7H-[1,2,4]triazolo[5,1-b][1,3]thiazin-7-ones by condensation of 5-R-1,2,4-triazole-3-thiones with 3-arylacryloyl chlorides was developed. The thiazine ring of the [1,2,4]triazolo[5,1-b][1,3]thiazin-7-ones is easily cleaved by treating with ammonia and hydrazine affording amides and hydrazides of 3-aryl-3-(1H-1,2,4-triazol-5-ylsulfanyl)propanoic acids. The latter react with isothiocyanates furnishing carbamoyl thiohydrazides of 3-aryl-3-(1H-1,2,4-triazol-5-ylsulfanyl)propanoic acids that in alkaline media undergo cyclization into 4-aryl-5-[2-(4H-1,2,4-triazol-5-ylsulfanyl)-2-phenylethyl]-2,4-dihydro-3H-1,2,4-triazole-5-thiones. 相似文献
18.
Abstract Reaction of dehydro-L-ascorbic acid with 1,2-diamino-4,5-dimethylbenzene and arylhydrazines afforded 3-[l-(aryl)hydrazono-L-threo-2,3,4-trihydroxybutyl]-6,7-dimethyl-lH-quinoxalin-2-ones. Their dehydrative cyclization gave 1-aryl-3-(L-threo-glycerol-1-yl)-6,7-dimethylpyrazolo[3,4-b] quinoxalines, whose acetylation and periodate oxidation were studied. 相似文献
19.
R. Madhav Carroll A. Snyder Philip L. Southwick 《Journal of heterocyclic chemistry》1980,17(6):1231-1235
1-(ω-Carboxyalkyl)-4-carboethoxy-2,3-dioxopyrrolidines were prepared by a one-pot synthesis from β-alanine or γ-aminobutyric acid, ethyl acrylate and diethyl oxalate. In a second one-pot process these products were hydrolyzed, decarboxylated and condensed with aromatic aldehydes under the influence of hydrochloric acid to yield 1-(ω-carboxyalkyl)-4-arylidene-2,3-dioxo-pyrolidines, which yielded 2-amino-4-aryl-6-(ω-carboxyalkyl)-5H-pyrrolo[3,4-d]pyrimidin-7-(6H)-ones upon treatment with guanidine. It was shown that 3,4-dihydro derivatives of certain 2-amino-4-aryl-5H-pyrrolo[3,4-d]pyrimidin-7-(6H)ones, formed initially in the guanidine reaction, readily undergo conversion to 5H-pyrrolo[3,4-d]pyrimidin-7-(6H)ones. 相似文献
20.
Dr. Jun Ying Jian-Shu Wang Lingyun Yao Dr. Wangyang Lu Prof. Dr. Xiao-Feng Wu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(64):14565-14569
A new procedure on palladium-catalyzed carbonylative cyclization of N-(2-pyridyl)sulfonyl (N-SO2Py)-2-iodoanilines with terminal alkenes has been developed for the rapid construction of dihydroquinolin-4(1H)-one scaffolds. Enabled by the chelating group and using benzene-1,3,5-triyl triformate (TFBen) as the CO source, both aromatic and aliphatic alkenes were smoothly transformed into the corresponding 2,3-dihydroquinolin-4(1H)-ones in good yields with excellent regioselectivities. Notably, the reaction of aromatic alkenes produces 2-aryl-2,3-dihydroquinolin-4(1H)-ones, while 3-alkyl-2,3-dihydroquinolin-4(1H)-ones were obtained when aliphatic alkenes were used. This protocol has been applied in the synthesis of antitumor agent A as well. 相似文献