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1.
R. A. Karakhanov V. I. Kelarev V. N. Koshelev G. V. Morozova Ammar Dibi 《Chemistry of Heterocyclic Compounds》1995,31(2):208-218
The condensation of hydrochloride sats of iminoesters of furan acids with hydrazides of carboxylic acids gives 2,5-disubstituted 1,3,4-oxadiazoles containing furan fragments. Such compounds are also formed in the condensation of hydrazides of 5-R-furan-2-carboxylic acids with hydrocloride salts of carboxylic acid iminoesters. The reaction of furan acids with hydrazine dihydrochloride in polyphosphoric acid gave symmetrically disubstituted 1,3,4-oxadiazoles containing furan fragments.Communication 3, see ref. [1].I. M. Gubkin State Petroleum and Natural Gas Institute, 117917, Moscow. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 238–249, February, 1995. Original article submitted January 24, 1995. 相似文献
2.
LingLing Peng Xiu Zhang Jie Ma ZhenZhen Zhong Zhe Zhang Yan Zhang JianBo Wang 《中国科学B辑(英文版)》2009,52(10):1622-1630
In this paper, we report the synthesis of furan derivatives from allenic sulfides. By the reaction with NaH, β-Hydroxyl allenic
sulfides were found to generate furan products in excellent yields with the removal of phenylthio group. β-Aldehyde allenic
sulfides were found to give similar furan products with one more substituent when treated with additional nucleophilic reagents.
β-ketone allenic sulfides can also cyclize to give furan derivatives with the promotion of P2O5. 相似文献
3.
4.
A. A. Ponomarev A. S. Chegolya N. S. Smirnova V. N. Dyukareva 《Chemistry of Heterocyclic Compounds》1967,2(2):113-117
This paper gives the results obtained by liquid phase catalytic hydrogenation under pressure, over ruthenium catalysts, of furan aldehydes, ketones, and carboxylic acids. It is shown that the ruthenium catalysts are highly effective for hydrogenating the furan ring, ethylenic double bonds, and the carbonyl group, though they are not selective with respect to them. At room temperature the furan ring is mostly reduced to a tetrahydrofuran one. It is confirmed that compounds containing the 1, 6-dioxaspiro [4, 4]-nonane grouping are formed by hydrogenating furfurylidene aldehydes and ketones, and -furylalkanols.For Part XXX see [15]. 相似文献
5.
The review analyzes the effects of the reaction conditions on the direction of the reactions between furans/formylfurans and hydrogen peroxide. The revealed dependences serve for the synthesis of the desired products and for development of new methods to access α-hydroxy hydroperoxides of furan aldehydes, 2-furanoic acid and its esters and amides, a series of furoic acids bearing the substituent at the furan ring, 2(5H)-furanone and its homologs and functional derivatives, as well as 2,5-dialkoxydihydrofurans. The developed procedures are more advantageous than the conventional methods. 相似文献
6.
AbstractA convergent synthesis of the southern furan segment of novel furanocembranoids from Croton oblongifolius has been accomplished involving silver-catalyzed cyclization of alkynyl diol as the key step towards 2, 5-disubstituted furan ring formation. 相似文献
7.
V. V. Poskonin L. V. Povarova L. A. Badovskaya 《Chemistry of Heterocyclic Compounds》1996,32(5):543-547
The oxidation of furan by aqueous hydrogen peroxide catalyzed by vanadium(IV) compounds was studied in homogeneous aqueous alcohol medium and a heterogeneous system in the presence of tridecylmethylammonium chloride. The optimum conditions of the process were determined for both versions. It was shown that they are similar in direction, duration, and degree of conversion of furan. At the same time, the composition and total yield of the products, as well as their yields in the organic and aqueous phases, depend on the type of solvent and vanadium catalyst.Kuban State Technological University, Krasnodar 350072. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 633–638, May, 1996. Original article submitted January 29, 1996. 相似文献
8.
B. V. Kurgan A. A. Gruze E. Ya. Lukevits S. A. Hiller 《Chemistry of Heterocyclic Compounds》1967,3(1):12-13
The corresponding 2-chloroethyl (2-chloroethylthiol) esters are synthesized by the action of ethylene chlorohydrin (chloroethylmercaptan) on the acid chlorides of 5-nitrofuran carboxylic acid and 3-(5-nitrofuryl-2)acrylic acid. The acid chlorides of benzoic, furan carboxylic, and 3-(furyl-2)-acryllc acids react with ethylene sulfide, to give 2-chloroethyl esters of those acids. Ethylene oxide does not react with the acid chlorides of benzoic acid and furan series carboxylic acids either at room temperature or on heating at 50° for 1 hour. 相似文献
9.
Hans Günther Wahl Hartmut M. Liebich Andreas Hoffmann 《Journal of separation science》1994,17(5):308-311
The separation and analysis of furan fatty acids and other minor component fatty acids present at very low concentrations in complex sample matrices, such as fish oil or lipids derived from liver and testes, require several pre-analytical separation steps if single column gas chromatography is to furnish sufficient resolution: after extraction and transesterification hydrogenation, urea complex precipitation and argentation TLC have been applied prior to GC analysis of furan fatty acids. By using multidimensional GC-MSD with cooled injection and flow-controlled column switching with intermediate cold trapping, it has been possible to identify directly the methyl esters of furan fatty acids without further pre-analytical separation. The most common of the furan fatty acids can be subdivided into two groups depending on whether they bear a propyl or pentyl side group in the 5-position of the furan ring. In addition to the eight furan fatty acids known to be present in fish oil, six new ones were identified, four with propyl substitution and two with pentyl substitution. Four have earlier been reported to be present in the hepatopancreas of crayfish and in fish tissue, whereas the propyl-substituted 16,19-epoxy-17,18-dimethyldocosa-16,18-dienoic acid and the pentyl-substituted furan fatty acid 6,9-epoxy-7-methyltetradeca-6,8-dienoic acid were hitherto unknown. 相似文献
10.
Abstract Polyammonium macrocycles containing sulfur and furan units in the macrocyclic ring have been synthesized and studied for ATPase activity. The synthetic methodology involved using tosyl protection for the amines and the formation of macrocyclic Lactams, followed by reduction using borane in THF. Deprotection of the tosylated forms of the macrocycle was accomplished using sodium in butanol for the furan macrocycles, and HBr in HOAc for the sulfur containing macrocycle. The macrocycles were found to be poor catalysts for ATP hydrolysis compared to other similar polyammonium macrocycles. 相似文献
11.
《Journal of polymer science. Part A, Polymer chemistry》2018,56(14):1516-1519
Polyamide composed of furan dimer, which is prepared from biomass‐derived organic molecule 2‐furfural, is synthesized. The reaction of 2,2′‐furan dimer 5,5′‐dicarbonyl chloride with several 1,ω‐diamines was carried out with a solution or interfacial polycondensation leading to the corresponding polyamide. Measurement of the melting point was performed resulting to exhibit a higher temperature compared with the related polyamide bearing a single furan ring composed of furan‐2,5‐dicarboxylic acid (FDCA). Thermal analyses (TG–DTA) also indicated higher temperatures of decomposition than those of FDCA‐derived polyamide. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56, 1516–1519 相似文献
12.
We describe an efficient new approach for the synthesis of seven-membered oxacycles that is based on the oxidation of a furan ring with singlet oxygen followed by an intramolecular Michael addition. 相似文献
13.
L. Ignatovich V. Romanov S. Belyakov E. Lukevics 《Chemistry of Heterocyclic Compounds》2012,48(3):408-411
The oximation of 5-tert-butylmethylsilyl-2-(trifluoroacetyl)furan with hydroxylamine leads to the exclusive formation of the E-isomer of 5-tert-butyldimethylsilyl-2-(2,2,2-trifluorohydroxyiminoethyl)- furan. 相似文献
14.
Summary 2-Methyl-, 2-(2'-carbomethoxyethyl-, 2-(3'-oxobutyl)-, and 2-(3',3'-dimethoxypropyl)furans add acryloyl chloride to yield furan acid chlorides or substituted furancarboxylic acids, which with alcohols form the corresponding esters. 相似文献
15.
A convenient new method for the arylation of furan with derivatives of diazoaminobenzene and isoamyl nitrite is described. Using this method the substituted 2-(X-phenyl)furan derivatives, where X is H, 4-CH3, 4-Cl, 4-Br, 3-Cl, 3,4-diCl, 4-NO2, 4-COOCH3, 4-COOH, 4-Cl-3-CF3 and 2-(3-pyridyl)furan were prepared. The reaction of methyl 4-aminobenzoate with furan and isopentyl nitrite gave (besides 2-(4-carbmethoxyphenyl)furan) 4,4′-dicarbmethoxydiazoaminobenzene, the structure of which was proved by mass spectrometry and by synthesis. This diazoaminobenzene derivative was unstable in the reaction medium and with isopentyl nitrite and furan at 30° gave 2-(4-carbmethoxyphenyl)furan. The mechanism of the reaction is discussed. 相似文献
16.
Yu. A. Mansurov G. G. Skvortsova V. K. Voronov 《Chemistry of Heterocyclic Compounds》1975,11(11):1254-1258
The reaction of vinyl esters of furan-2-carboxylic, 5-bromofuran-2-carboxylic, and trans-β-(2-furyl)acrylic acids with aliphatic, aromatic, and heterocyclic amines was investigated. It was established that azoles add to the double bond of the vinyloxy group of the ester in conformity with the Markownikoff rule. α-(1-Azolyl)ethyl esters of the furan-2-carboxylic and β-(2-furyl)acrylic acids were synthesized. Acylation of the amines takes place during the reaction of vinyl esters of the furan series with diethylamine, aniline, p-vinyloxyaniline, morpholine, and piperidine. 相似文献
17.
Summary ß-(Furyl-2)propionic acid and its methyl and ethyl esters add in acid medium to ,ß-unsaturated aldehydes and ketones, forming oxoacids and oxoesters of the furan series. 相似文献
18.
Summary A number of previously unknown difunctional derivatives in the furan and tetrahydrofuran series was obtained by acetalization and liquid-phase hydrogenation.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 389–391, February, 1965 相似文献
19.
G. A. Karlivans R. E. Valters A. E. Bace J. V. Gulbis 《Chemistry of Heterocyclic Compounds》1996,32(4):400-404
We have synthesized novel condensed heterocyclic derivatives of benzofuran by reaction of 2,5-dihydroxy3, 4, 6, 7-tetrachloro-2, 3-dihydrobenzo[b]furan (I) with 4-phenyl- and 4-methylthiosemicarbazides, diphenylthiocarbazone, and also via cyclization of 2, 5-dihydroxy-4, 6, 7-trichloro-3-(N, N-diethyldithio-carbarnoyl)-2, 3dihydrobenzo[b]furan (obtained in the reaction of benzofuran I with sodium NN-dithiocarbamate).Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 463467, April 1996. 相似文献
20.
V. G. Glukhovtsev S. V. Zakharova R. A. Karakhanov 《Chemistry of Heterocyclic Compounds》1970,4(2):267-268
Five new esters of the furan series have been synthesized by the reaction of-(5-methyl-2-furyl)propionyl chloride with 2-(3-hydroxypropyl)-furan, 2-(3-hydroxybutyl)tetrahydrofuran, and furfuryl, tetrahydrofurfuryl, and allyl alcohols in the presence of pyridine. 相似文献