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1.
A. A. Chesnyuk S. N. Mikhaylichenko L. D. Konyushkin S. I. Firgang V. N. Zaplishnyi 《Russian Chemical Bulletin》2005,54(8):1900-1906
New 1,2,4-oxadiazolyl-1,3,5-triazines were synthesized from amidoximes derived from sym-triazine mononitriles. The structure of one of the resulting compounds was studied in detail by X-ray diffraction.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1845–1850, August, 2005. 相似文献
2.
B. S. Fedorov M. A. Fadeev A. A. Gidaspov E. A. Kosareva V. V. Bakharev 《Chemistry of Heterocyclic Compounds》2005,41(2):228-234
The aziridation of 2-R-4,6-bis(trinitromethyl)-1,3,5-triazines containing electron-donor substituents has been studied. It was found that the corresponding 4-azido-2-dialkylamino-6-trinitromethyl-1,3,5-triazines are formed when R = NMe2, NEt2. When R = O–NMe4
+ a novel reaction route was discovered leading to the tetramethylammonium salt of 5-polynitromethyltetrazolo[1,5-a]-1,3,5-triazin-7-one which is formed as a result of azido-tetrazole and lactim-lactam tautomeric conversion. Denitration of this salt at the trinitromethyl group occurs with retention of the tetrazolo-1,3,5-triazine structure. An X-ray analysis was carried out for the denitration product which was the dipotassium salt of 5-dinitromethyltetrazolo[1,5-a]-1,3,5-triazin-7-one.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 259–266, February, 2005. 相似文献
3.
Mikhailichenko S. N. Chesnyuk A. A. Konyushkin L. D. Zaplishnyi V. N. 《Russian Chemical Bulletin》2003,52(10):2157-2160
Reactions of (4,6-disubstituted 1,3,5-triazin-2-yl)trimethylammonium chlorides with glycine sodium salt in the presence of Et3N afforded bis(triazin-2-yl) ethers instead of the expected triazinylaminoacetic acids. The structures of the resulting compounds were established by the independent synthesis, spectroscopic data, and X-ray diffraction analysis. 相似文献
4.
V. V. Dovlatyan K. A. Eliazyan V. A. Pivazyan A. P. Yengoyan 《Chemistry of Heterocyclic Compounds》2010,46(8):966-970
On thermolysis of 4-methoxy- and 4-alkylamino-2-(2-chloroethoxy)-6-morpholino(piperidino)-sym-triazines, the corresponding oxazolo- or imidazo-sym-triazinones are formed by elimination of methyl chloride or hydrogen chloride, and 4,6-disubstituted 3-(2-chloroethyl)-sym-triazin-2-ones are formed from 4,6-dimorpholino(dipiperidino) derivatives. 相似文献
5.
M. Madesclaire P. Coudert V. P. Zaitsev Yu. V. Zaitseva 《Chemistry of Heterocyclic Compounds》2004,40(10):1310-1314
The interaction of (1S,2S)-2-amino-1-(4-nitrophenyl)-1,3-propanediol with a series of symmetrical ketones has been studied. As a result isomeric oxazolidines are formed in a ratio of 85:15. These oxazolidines were shown to decompose readily under the action of hydrazine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1518–1523, October, 2004. 相似文献
6.
A. V. Popov A. V. Shastin E. L. Luzina A. N. Pushin T. N. Gavrishova 《Russian Chemical Bulletin》1999,48(8):1548-1552
A procedure was developed for the synthesis of substituted 2-amino-4,6-bis(nonafluoro-tert-butyl)-1,3,5-triazines from 2-chloro-4,6-bis(nonafluoro-tert-butyl)-1,3,5-triazine and aliphatic and aromatic amines. The data of19F NMR spectroscopy are indicative of the presence of a barrier to internal rotation.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1568–1572, August, 1999. 相似文献
7.
The alkylation of salicylaldehyde and o-hydroxyacetophenone with 2-amino-4-arylamino-6-chloromethyl-1,3,5-triazines is accompanied by intramolecular condensation and affords 2-aryl-4-arylamino-6-benzo[b]furan-2-yl-1,3,5-triazines.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2758–2759, December, 2004. 相似文献
8.
A. N. Chekhlov 《Journal of Structural Chemistry》2005,46(2):381-385
Crystal and molecular structure of 2-(o-hydroxyphenyl)-4,6-diphenylpyridine C23H17NO (I) has been studied by single crystal XRD. The structure (monoclinic, space group P21/c, a = 8.757(2) Å, b = 20.682(4) Å, c = 9.743(2) Å, β = 108.14(2)°, Z = 4) was solved by the direct method and refined anisotropically in the full-matrix approximation to R = 0.076 using all 2660 measured independent reflections (automated diffractometer CAD-4, CuKα). OH group of the molecule of I is disordered in the crystal over three positions with occupation factors 70%, 15% and 15%. The structure contains a very strong intramolecular hydrogen bond O-H?N disordered over three directions. 相似文献
9.
V. V. Bakharev A. A. Ghidaspov D. B. Krivolapov E. V. Mironova I. A. Litvinov 《Chemistry of Heterocyclic Compounds》2006,42(8):1051-1058
2-Amino-4-azido-1,3,5-triazin-6(1H)-ones were synthesized by successive substitution of the trinitromethyl groups in 2-amino-4,6-bis(trinitromethyl)-1,3,5-triazines
under the influence of azide and nitrite ions. Interaction of 2-amino-4-azido-1,3,5-triazin-6(1H)-ones with bases led to the
azido-tetrazole tautomeric conversion give salts of 5-aminotetrazolo[1,5-a]-1,3,5-triazin-7-one.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1211–1219, August, 2006. 相似文献
10.
Vera L. M. Silva Artur M. S. Silva Diana C. G. A. Pinto José A. S. Cavaleiro José Elguero 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):87-95
Abstract An efficient synthesis method for the preparation of a series of new (Z)- and (E)-3(5)-(2-hydroxyphenyl)-4-styrylpyrazoles was developed. The reaction of (Z)- and (E)-3-styrylchromones with hydrazine hydrate afforded the corresponding (Z)- and (E)-3(5)-(2-hydroxyphenyl)-4-styrylpyrazoles, except for nitro derivatives, where both (Z)- and (E)-4′-nitro-3-styrylchromones afforded (E)-3(5)-(2-hydroxyphenyl)-4-(4-nitrostyryl)pyrazoles. The reaction mechanism for these transformations is discussed and the
stereochemistries of all products were established by NMR experiments.
Graphical abstract
相似文献
11.
An efficient and practical procedure was developed to prepare novel 2-(arylmethyl)amino-4-arylamino-6-alkyl-1,3,5-triazines, starting from dicyandiamide and the corresponding arylamines under microwave irradiation and its scope is demonstrated with a number of examples. The valuable feature of this procedure included the short reaction times, high yields, and easy operation. 相似文献
12.
S. Belyakov M. Fleisher D. Jansone L. Leite E. Lukevics 《Chemistry of Heterocyclic Compounds》2009,45(4):417-421
Monocrystals of the trans and cis isomers of 3-cyano-4-[2-(4-methoxyphenyl)vinyl]-6,6-dimethyl-5,6-dihydro-2H-pyran have been obtained and an X-ray structural
analysis of them has been carried out. Both compounds have a molecular structure corresponding to symmetry group C1. The heterocyclic ring is in a distorted envelope conformation. The crystals of the trans isomer are rhombic and have a fir-tree type of packing. The crystal packing of the cis isomer is formed by pairs of molecules, each of which consists of only one enantiomer.
*Dedicated to deeply respected Professor Hank van der Plas in connection with his jubilee.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 535-540, April, 2009. 相似文献
13.
2-Substituted benzimidazoles were synthesized by the reaction of 1-(3(4)-acetylphenyl)-4-carboxy-2-pyrrolidinones with o-phenylenediamine.
Their reactions with sodium hydroxide and hydrazine and some of their chemical characteristics were investigated.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp.1625–1630, November, 2007. 相似文献
14.
A. A. Chesniuk S. N. Mikhailichenko V. S. Zavodnov V. N. Zaplishny 《Chemistry of Heterocyclic Compounds》2002,38(2):177-182
New quaternary ammonium salts of monochloro-4,6-disubstituted 1,3,5-triazines have been obtained. These compounds are convenient synthons for the synthesis of new cyano, alkoxy, and other derivatives of sym-triazine. Some conversions of the synthesized salts have been studied. An elimination-isomerization reaction of the sym-triazine ring into a 2-oxo-1,2-dihydro-sym-triazine ring was discovered. 相似文献
15.
Wen-Chung Shieh Zhuoliang Chen Song Xue Run-Ming Wang Oljan Repi? 《Tetrahedron letters》2008,49(37):5359-5362
Our study demonstrated that 4-(4,6-dimethoxy-1,3,5-triazine-2-yl)-4-methyl-morpholinium chloride (DMTMM) is a versatile coupling reagent for the synthesis of sterically-hindered peptidomimetics. It is superior to HBTU/HOBt and CDMT in controlling racemization and N-arylation, respectively. 相似文献
16.
A. N. Chekhlov 《Journal of Structural Chemistry》2005,46(5):946-949
The crystal and molecular structure of E-3-(1,3-dimethylindol-2-yl)methylene-4-isopropylidenetetrahydrofuran-2,5-dione, C18H17NO3 (I), was investigated by XRD. The monoclinic structure of I (space group P21/c, a = 12.411(2) Å, b = 7.586(1) Å, c = 16.107(3) Å, β = 96.90(2)°, Z = 4) was solved by direct methods and refined by the full-matrix least squares in an anisotropic approximation to R = 0.044 for all 2842 independent reflections collected (CAD-4 automatic diffractometer, λCuK α). The geometric parameters of sterically strained molecule I were determined with a high accuracy. 相似文献
17.
I. Yu. Bagryanskaya Yu. V. Gatilov S. A. Osadchii A. A. Martynov M. M. Shakirov E. E. Shul'ts G. A. Tolstikov 《Chemistry of Natural Compounds》2005,41(6):657-662
Oximation of oreoselone to produce a mixture the E- and Z-oximes was investigated. The crystal and molecular structures of
oreoselone Z-oxime and the Beckmann rearrangement product of oreoselone E- or Z-oximes and PCl5, 7-(1-chloro-2-methylpropoxy)-2-oxo-2H-1-benzopyran-6-carbonitrile, were established by XSA. Hydrolysis of the latter produced
7-hydroxy-2-oxo-2H-1-benzopyran-6-carbonitrile.
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Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 541–545, November–December, 2005. 相似文献
18.
4-Amino-5-benzoyl(acetyl)isoxazole-3-carboxamides were prepared by cyclization of α-hydroxyimino nitriles O-alkylated with bromoacetophenones (bromoacetone). The purity of the target 4-aminoisoxazoles can be substantially increased
by treating O-alkylated oximes with LiClO4 before cyclization.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 1159–1165, May, 2005. 相似文献
19.
Benson M. Kariuki Bakr F. Abdel-Wahab Hanan A. Mohamed Mohamed S. Bekheit Gamal A. El-Hiti 《Molecules (Basel, Switzerland)》2022,27(24)
Reactions of 1-(5-methyl)-1H-1,2,3-triazol-4-yl)ethan-1-ones and benzaldehydes in ethanol under basic conditions gave the corresponding chalcones. Reactions of the chalcones combined with thiosemicarbazide in dry ethanol containing sodium hydroxide afforded the corresponding pyrazolin-N-thioamides. Reactions of the synthesized pyrazolin-N-thioamides and several ketones (namely, ethyl 2-chloro-3-oxobutanoate, 2-bromoacetylbenzofuran, and hydrazonoyl chloride) gave the corresponding novel 2-(1,2,3-triazol-4-yl)-4,5-dihydro-1H-pyrazol-1-yl)thiazoles in high yields (77–90%). Additionally, 2-(4,5-dihydro-1H-pyrazol-1-yl)-4-(1H-1,2,3-triazol-4-yl)thiazoles were obtained in high yields (84–87%) from reactions with N-pyrazoline-thioamides and 4-bromoacetyl-1,2,3-triazoles under basic conditions. The structures of six of the newly synthesized heterocycles were confirmed by X-ray crystallography. 相似文献
20.
A. N. Chekhlov 《Journal of Structural Chemistry》2004,45(4):724-728
The crystal structure of 1-(2-pyridiniomethyl)-2,4-bis(phenylsulfonyl)benzene bromide, (C24H20NO4S2)+. Br– (I) has been investigated by X-ray diffraction (XRD)analysis. The triclinic structure of I (space group P1, a = 7.863 , b = 8.350 , c = 9.043 , = 94.00°, = 97.81°, = 104.62°, Z = 1) was solved by direct methods and refined by full-matrix least-squares analysis in an anisotropic approximation to R = 0.048 for all 4570 reflections collected (CAD-4 automatic diffractometer, CuK
). The geometrical parameters of the organic cation were determined with a sufficient degree of accuracy. The crystal structure of I involves a very strong interionic hydrogen bond N+-HBr–.Original Russian Text Copyright © 2004 by A. N. ChekhlovTranslated from Zhurnal Strukturnoi Khimii, Vol. 45, No. 4, pp. 759–763, July–August, 2004.This revised version was published online in April 2005 with a corrected cover date. 相似文献