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1.
Korolev V. L. Toporov V. V. Merkulova N. L. Danilenko V. M. Ivshin V. P. Pivina T. S. 《Russian Chemical Bulletin》2017,66(11):2126-2130
N-Substituted imidazo[4,5-e]benzo[1,2-c;3,4-c’]difuroxans were synthesized by phase-transfer catalyzed alkylation of imidazo[4,5-e]benzo[1,2-c;3,4-c’]difuroxan salts with various alkylating agents. Acid hydrolysis of N-(ethoxycarbonylmethyl)imidazo[4,5-e]benzo-[1,2-c;3,4-c’]difuroxans gives the corresponding carboxylic acids. Structures of the synthesized compounds were confirmed by NMR spectroscopy, high resolution mass spectrometry, IR spectroscopy, and elemental anslysis.
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A. P. Mkrtchyan A. Sh. Oganisyan Art. Sh. Oganisyan A. S. Noravyan 《Chemistry of Heterocyclic Compounds》2005,41(2):235-237
A method has been developed for the synthesis of 4-thioxopyrano[4,3: 4,5]thieno[2,3-d]pyrimidines from the corresponding acyl derivatives of 2-amino-3-cyanothieno[2,3-c]pyran.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, 267–269, February, 2005. 相似文献
4.
V. I. Terenin E. L. Ruchkina A. P. Pleshkova Yu. G. Bundel 《Chemistry of Heterocyclic Compounds》1998,34(7):822-829
We have studied the aminomethylation reaction of alkyl substituted dipyrrolo[1,2-a; 2,1-c]pyrazines and their 5,6-dihydro analogs using different aminomethylating agents. Use of alkoxydialkylaminomethanes (aminoacetals) as Mannich reagents leads to the highest yields of the aminomethylated dipyrrolopyrazines. The compounds prepared have been studied by mass spectrometry.For Communication 3, see [1].M. V. Lomonosov State University, Moscow 119899. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 949–957, July, 1998. 相似文献
5.
V. I. Terenin A. V. Borisov E. L. Ruchkina A. P. Pleshkova 《Chemistry of Heterocyclic Compounds》1999,35(2):211-215
We have synthesized a series of previously unreported azo dyes via the azo coupling of alkyl substituted dipyrrolopyrazines with aryldiazonium chloride. For this type of substrate where one or both -positions of the pyrrole rings of the molecules are not occupied by substituents, electrophilic attack was found to occur initially at carbon atom C(3).For communication 4 see [1]M. V. Lomonosov State University, Moscow 119899, Russia Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 236–240, February, 1999. 相似文献
6.
The functionalized spiro[indoline-3,40-pyrano[3,2-h]quinolines] were efficiently prepared in high yields from three-component reaction of 8-hydroxyquinoline, isatins and malononitrile or ethyl cyanoacetate in ethanol at room temperature for about 12 h in the presence of piperidine. 相似文献
7.
A. Sh. Oganisyan A. S. Noravyan M. Zh. Grigoryan Arzh Sh. Oganisyan 《Chemistry of Heterocyclic Compounds》1999,35(9):1094-1096
New derivatives of pyrano[3,45,6]pyrido[2,3-d]pyrimidines were synthesized from ethyl 2-amino-7,7-dimethyl-7,8-dihydro-5H-pyrano[4,3-b]pyridine-3-carboxylate.A. L. Mndzhoyan Institute of Fine Organic Chemistry, National Academy of Sciences of the Republic of Armenia, Erevan. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1239–1241, September, 1999. 相似文献
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Many polynuclear Cu(I) compounds have been synthesized, but the problem whether there is direct or no direct Cu-Cu bonding
in these compounds is not clear. The electronic structure of [CuNRR’]4 type clusters was investigated by using density functional methods. The results of geometrical optimization are in good agreement
with experiment, and the localization of MO’s shows that there are four Cu-Cu σ bonds to form the square Cu4 ring in addition to the four bridging Cu-N-Cu bonds. A concept of the covalence of molecular fragments is proposed to describe
the bonding in these clusters. 相似文献
10.
V. I. Terenin K. V. Karapetyan E. L. Ruchkina V. M. Mamaev Yu. G. Bundel' 《Chemistry of Heterocyclic Compounds》1995,31(11):1353-1359
The semiempirical quantum-chemical method PM3 has been used in a study of the electronic and spatial structure of dipyrrolo[l , 2-a; 2,1-cjpyrazines and 5,6-dihydrodipyrrolo[1,2-a; 2,1-cjpyrazines, and also their reactivities in electrophilic substitution reactions (protonation, acylation).M. V. Lomonosov Moscow State University, Moscow 119899 Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1559–1565, November, 1995. Original article submitted September 13, 1995 相似文献
11.
1-Phenyltricyclo[4.1.0.02.7]heptane reacted with N-bromo-, N-chloro-, and N-iodosuccinimides and with mercury(II) acetate in the presence of sodium azide as external nucleophile to give conjugate addition products to the central C1–C7 bicyclobutane bond with a norpinane structure, where the azido group and the phenyl were attached to the same carbon atom (C6). The bromo- and chloroazidation showed anti-stereo-selectivity, and the iodoazidation, moderate syn-stereoselectivity; the mercuroazidation afforded exclusively the corresponding syn-addition product. Hydro-, bromo- and chlorodemercuration of the mercury adduct with sodium tetrahydridoborate and elemental bromine and chlorine, respectively, did not involve the azido group, and the original configuration was retained. The reduction of the hydrodemercuration product with LiAlH4 gave 6-exo-phenylbicyclo[3.1.1]heptan-6-amine which was transformed in three steps into conformationally rigid 6-endo-(acetamido)bicyclo[3.1.1]heptane-6-carboxylic acid. 相似文献
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V. V. Gavrilov M. N. Shamsutdinov G. A. Chmutova R. M. Vafina Yu. G. Shtyrlin V. V. Klochkov E. N. Klimovitskii 《Russian Journal of Organic Chemistry》2007,43(12):1846-1853
Spiro[cyclohexane-1,4′-[3,5]dioxabicyclo[5.1.0]octanes] were synthesized, and their conformational behavior was studied by dynamic 13C NMR spectroscopy. Anancomeric displacement of conformational equilibrium toward two nonequivalent twist conformers with close energies was revealed. The relative Gibbs energies ΔG o and enthalpies of formation ΔH o of twist and chair-like conformers with endo and exo orientation of the three-membered ring of structurally related formaldehyde and acetone acetals were calculated in terms of the density functional theory at the B3LYP/6-31G(d,p) level. Like spiro-cyclohexane analogs, they were shown to have a non-chair conformation. 相似文献
14.
The synthesis of selectively labeled [3-14C]-L-tryptophan and its derivative 5′-hydroxy-[3-14C]-L-tryptophan using chemical and multienzymatic methods is reported. The key intermediate for this synthesis, [3-14C]-DL-alanine was obtained from 14CH3I as a result of its condensation with N-(diphenylmethylene)glycine tert-butyl ester. Next, the mixture containing [3-14C]-DL-alanine, indole or 5-hydroxyindole has been converted to [3-14C]-L-tryptophan or 5′-hydroxy-[3-14C]-L-tryptophan, respectively, in a one-pot multienzymatic reaction using four enzymes: D-amino acid oxidase, catalase, glutamic-pyruvic
transaminase and tryptophanase. 相似文献
15.
Russian Journal of Organic Chemistry - New spiro heterocycles, spiro[benzo[h]chromene-4,3′-indoles] and spiro[benzo[f]chromene-1,3′-indoles], have been synthesized in 50–60% yield... 相似文献
16.
D. A. Kissounko M. V. Zabalov Yu. F. Oprunenko D. A. Lemenovskii 《Russian Chemical Bulletin》2000,49(7):1282-1286
Reactions of 2-ethyl-5-methylcyclopenta[b]thienyllithium (thiopentalenyllithium) (2) with various electrophilic reagents afford σ-element-substituted thiopentalenes. However, the reaction with Ph3SnCl yields only one of two possible isomers,viz, triphenyl(4H-cyclopenta[b] thiophen-4-yl)stannane (4c), whereas the reactions with Me3SiCl, Me3SiCl, or Ph2PCl give both possible isomers,viz., trimethyl(6H-cyclopenta[b]thiophen-6-yl)silane (3a) and trimethyl(4H-cyclopental[b]thiophen-4-yl)silane (4a), trimethyl(6H-cyclopenta[b]thiophen-6-yl)stannane (3b) and trimethyl(4H-cyclopental[b]thiophen-4-yl)stannane (4b), or diphenyl(6H-cyclopenta[b]thiophen-6-yl)phosphine (3d) and diphenyl(4H-cyclopenta[b]thiophen-4-yl)phosphine (4d) in ratios of 1∶2, 1∶2, or 1∶1, respectively. The structure of compound4c was established by X-ray diffraction analysis. The observed regioselectivity of formation of compound4c is attributed to the specific precoordination of the tin atom by the sulfur atom of the thiopentalenyl ligand and to the
steric overcrowding of the Sn atom in organotin electrophiles.
Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1285–1289, July, 2000. 相似文献
17.
A. Sh. Oganisyan A. S. Noravyan G. M. Avetisyan 《Chemistry of Heterocyclic Compounds》1998,34(6):700-701
Methods for the synthesis of 2,4-dithioxo-6,6-dimethyl-5,6-dihydro-8H-pyrano(thiopyrano)[4,34,5]thieno[2,3-d]pyrimidines have been developed.For Communication 10 see [1].A. L. Mndzhoyan Institute of Technical Organic Chemistry, National Academy of Sciences of the Republic of Armenia, Erevan 375014. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 803–804, June, 1998. 相似文献
18.
E. E. Stepanova M. V. Dmitriev A. N. Maslivets 《Russian Journal of Organic Chemistry》2017,53(12):1851-1856
The hetero-Diels–Alder reaction of 3-aroylpyrrolo[2,1-c][1,4]benzoxazine-1,2,4-triones with styrene afforded mixtures of diastereoisomeric (10R*,11aR*)- and (10S*,11aR*)-8-aryl-10-phenyl-10,11-dihydropyrano[4′,3′: 2,3]pyrrolo[2,1-c][1,4]benzoxazine-6,7,12-triones. 相似文献
19.
Yagodkina-Yakovenko M. S. Bol’but A. V. Vovk M. V. 《Russian Journal of Organic Chemistry》2018,54(10):1569-1572
Russian Journal of Organic Chemistry - Methyl 2-(bromomethyl)thiophene-3-carboxylates reacted with substituted 2-hydroxybenzonitriles to give methyl... 相似文献
20.
Substituents in the 3 and 6-positions of benzo[b]-1,4-diazabicyclo[2.2.2]octane are capable of influencing the reactivity of the nitrogen atoms in the hydroxyethylation reaction due to steric hindrances or anchimeric contribution. Depending on the reaction conditions and substituents in the aromatic ring of benzo[b]-1,4-diazabicyclo[2.2]octane, either mono- or bis-quaternary salts were obtained.For Communication 24, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 215–218, February, 1992. 相似文献