共查询到20条相似文献,搜索用时 0 毫秒
1.
I. N. Tarabara Ya. S. Bondarenko A. A. Zhurakovskii L. I. Kas’yan 《Russian Journal of Organic Chemistry》2007,43(9):1297-1304
New urea, carbamates, and carboxamides of the norbornene series were synthesized on the basis of 4-isocyanatomethyl-4-azatricyclo[5.2.1.02,6-endo ]dec-8-ene-3,5-dione, and their behavior in reactions with various electrophiles was studied. The structure of the isolated compounds was confirmed by the IR and 1H NMR spectra. 相似文献
2.
I. V. Tkachenko I. N. Tarabara I. V. Omel’chenko V. A. Pal’chikov 《Russian Journal of Organic Chemistry》2016,52(5):661-669
Study of isomerization of 5-endo-hydroxy-4-azatricyclo[5.2.1.02,6]dec-8-en-3-ones under the action of Lewis acids (MgBr2, AlCl3), CF3COOH, and NaH showed that the optimum catalyst of the process was trifluoroacetic acid. In reaction of 4-benzyl-5-endo-hydroxy-4-azatricyclo-[5.2.1.02,6]dec-8-en-3-one with anhydrous AlCl3 in benzene was unexpectedly isolated N-benzyl-3-(diphenylmethyl)bicyclo[2.2.1]hept-5-ene-2-carboxamide. A convenient method was developed for the preparation of 5-exo-alkoxy-4-alkyl(aryl)-4-azatricyclo[5.2.1.02,6]dec- 8-en-3-ones. 相似文献
3.
I. N. Tarabara Ya. S. Bondarenko L. I. Kas’yan 《Russian Journal of Organic Chemistry》2009,45(2):234-241
Reactions were performed of (3,5-dioxo-4-azatricyclo[5.2.1.02-endo,6-endo ]dec-8-en-4-yl)carboxylic acids and their derivatives with p-nitrophenyl azide. A significant fact of the involvement of the carboxy group into the formation of aziridine ring was established and the intermolecular character of this process was confirmed. The structure of compounds synthesized was proved by IR and 1H NMR spectra. 相似文献
4.
X-ray structures of Diels–Alder adducts of thiophene with N-methylmaleimide and 2,5-dimethylthiophene with N-phenylmaleimide were determined and compared to literature data. In addition, quantum chemical calculations at various levels
of theory were used to study their molecular and electronic structure. A comparison with experimental results showed that
MP2/6-31G*, HF/6-311+G** and PBE1PBE/6-31G* methods give the most accurate structures.
相似文献
Davor MargetićEmail: |
5.
V. A. Gorpinchenko D. V. Petrov S. L. Khursan V. A. Dokichev Yu. V. Tomilov 《Chemistry of Heterocyclic Compounds》2009,45(9):1039-1046
The hydrogenation at Raney nickel of the pyrazoline ring in methyl exo-3,4-diazatricyclo-[5.2.1.02,6]dec-4-ene-5-carboxylate takes place quantitatively with the preferential formation of the trans isomer of 5-amino-exo-3-azatricyclo[5.2.1.02,6]decan-4-one. The 3-methoxycarbonylmethyl-, 3-acetyl-, and 3-nitroso-substituted esters are not hydrogenated under these conditions. 相似文献
6.
L. I. Vlasova S. S. Faizullina A. N. Lobov O. S. Kukovinets V. A. Dokichev 《Russian Journal of Organic Chemistry》2016,52(12):1792-1796
5-(Benzylamino)-exo-3-azatricyclo[5.2.1.02,6]decan-4-one derivatives were synthesized in up to 94% yield by condensation of norbornane-fused 3-aminopyrrolidin-2-one with aromatic aldehydes. 相似文献
7.
Treatment of exo-3,4-diazatricyclo[5.2.1.02,6]dec-4-ene with methyl acrylate, acrylonitrile, ethylene oxide, acetic acid and nitrosonium cation gave a series of 3-N-substituted
exo-3,4-diazatricyclo[5.2.1.02,6]dec-4-enes.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 533–537, April, 2007. 相似文献
8.
Eberhard Reimann Rainer Hertel Jürgen Krauss 《Monatshefte für Chemie / Chemical Monthly》2008,139(6):673-684
Alkylation of Reissert compounds derived from 3-methylisoquinolines with several 2-cyanobenzylbromides followed by hydrolytic cleavage provided the corresponding 1-benzyl-3-methylisoquinolines. Treatment of the latter with methylmagnesiumiodide caused cyclization to the title compounds rather than formation of 2-acetylbenzylisoquinolines. 相似文献
9.
I. G. Davydenko Yu. L. Slominskii O. I. Kalchenko A. V. Gutov A. N. Chernega A. I. Tolmachev 《Russian Chemical Bulletin》2008,57(1):159-164
A procedure was developed for the synthesis of derivatives of the new heterocyclic system, benzo[cd]furo[2,3-f]indole, based on the cyclodehydration of 6-acylmethyloxy-1-alkyl-benzo[cd]indol-2(1H)-ones. Either 7- or 8-aryl derivatives of benzo[cd]furo[2,3-f]indol-4(5H)-ones can be prepared depending on the reaction conditions. The molecular and crystal structures of 7- and 8-phenylbenzo[cd]furo[2,3-f]indol-4(5H)-ones were established by X-ray diffraction. 相似文献
10.
It was found that the condensation of two equivalents of 4-hydroxy-6-methyl-2H-pyran-2-one or 4-hydroxycoumarin with arylglyoxals in boiling formic acid leads to 4H-furo[3,2-c]-pyran-4-ones or 4H-furo[3,2-c]chromen-4-ones, respectively. 相似文献
11.
Summary. A new synthetic route was developed for the preparation of trans-3-hydroxy-16,17-seco-pregna-5,17(20)-dien-16-al, using Grob fragmentation as the key step. This seco-steroid contains a formyl group and an unsaturated side-chain in a sterically favourable position, and is therefore a promising starting material for the synthesis of novel condensed steroid heterocycles.Received March 22, 2003; accepted April 22, 2003
Published online September 25, 2003 相似文献
12.
O. N. Zefirova L. A. Zasurskaya E. V. Nurieva N. V. Zyk N. S. Zefirov 《Structural chemistry》2007,18(4):461-464
Molecular structure of ethylene acetal of 3-trityloxymethylbicyclo[3.3.1]nonane-2-on-7-ol (3) was determined by X-ray investigation. It was revealed that 3 has endo-endo-configuration and adopt chair-boat-conformation. The distortion of rings was evaluated by calculation of the Zefirov–Palyulin and Cremer–Pople puckering parameters.
Failure of esterification of 3 was rationalized in terms of steric hindrance and intramolecular hydrogen bonding.
相似文献
O. N. ZefirovaEmail: |
13.
In neutral zinc the 4p
2 configuration lies above the 3d
104s ionization limit and its levels become perturbers in the continuum. Lines have been identified in the Zn I spectrum for the
multiplet, whereas no lines have been found for transitions to 4p
2 1
D or 1
S. In this paper, cross sections for photoionization from 4s4p levels are reported that reveal the positions and widths of the 4p
2 resonances. Calculations were performed using the multiconfiguration Hartree-Fock (MCHF) and B-spline R-matrix (BSR) method. Results from Breit–Pauli calculations that ignore the background continua are also presented. Included
in the latter are energies for the levels and transition data (transition energies, line strengths, f-values, and A-rates) for all E1 transitions between these
levels. Transition energies and the agreement in the length and velocity values, particularly for allowed transitions, indicate
the accuracy of the computational model. Line widths are compared with other estimates.
Contribution to the Serafin Fraga Memorial Issue. 相似文献
14.
S. O. Kasatkina E. E. Stepanova M. V. Dmitriev A. N. Maslivets 《Russian Journal of Organic Chemistry》2018,54(7):1055-1060
3-Aroylpyrrolo[1,2-a]quinoxaline-1,2,4(5H)-triones reacted with 2,3-dihydrofuran and 3,4-dihydro-2H-pyran to give mixtures of the corresponding hetero-Diels–Alder (furo- and pyrano[3″,2″: 5′,6′]pyrano- [4′,3′: 2,3]pyrrolo[1,2-a]quinoxalines) and Michael adducts (furyl- and pyranylpyrrolo[1,2-a]quinoxalines). 相似文献
15.
Mono- and tetrasubstituted derivatives of p-tert-butylthiacalix[4]arene containing acrylate and acrylamide fragments are synthesized for the first time. The Michael aza-addition of benzylamine to the synthesized acrylamide and acrylate thiacalixarene derivatives is studied. 相似文献
16.
The alkylation of methyl 4H-thieno[3,2-b]pyrrole-5-carboxylate with methyl iodide and allyl, propargyl, and benzyl bromides in the presence of sodium hydride in THF afforded the corresponding N-substituted derivatives. Some reactions of the alkylation products were studied. 相似文献
17.
18.
V. A. Pal’chikov I. N. Tarabara I. V. Omel’chenko O. V. Shishkin L. I. Kas’yan 《Russian Journal of Organic Chemistry》2010,46(6):823-829
Acylation of N-substituted exo-2-hydroxy-5-oxo-4-oxatricyclo[4.2.1.03,7]nonane-endo-9-carboxamides on heating in boiling glacial acetic acid gave the corresponding trans-diacetoxy imides of the norbornane series. The effect of the reaction time on the product composition was studied in the
reaction with exo-2-hydroxy-N-(4-methylphenyl)-5-oxo-4-oxatricyclo[4.2.1.03,7]nonane-endo-9-carboxamide. The structure of the resulting norbornane-2,3-dicarboximides was confirmed by IR, 1H NMR, and mass spectra, and the structure of N-(2,5-dimethylphenyl)-exo-2,endo-3-diacetoxybicyclo[2.2.1]heptan-endo-5,endo-6-dicarboximide was additionally proved by X-ray analysis. 相似文献
19.
B. T. Bagmanov 《Russian Journal of Organic Chemistry》2007,43(11):1635-1641
Stereochemistry of the oxidation of N-arylbicyclo[2.2.1]hept-5-ene-endo-and-exo-2,3-dicarboximides at the double bond with peroxyacetic acid generated in situ in the presence of sulfuric acid and with an anhydrous dioxane solution of peroxyacetic acid was studied. In both cases, the reaction was stereospecific, regardless of the substituent in the N-aryl group and configuration of the imide ring, but the reaction direction depended on the presence of water in the system. In the first case, the corresponding trans-5,6-dihydroxy derivatives were formed, while in the second, exo-5,6-epoxy derivatives. The oxidation of N-arylbicyclo[2.2.1]-hept-5-ene-endo-and-exo-2,3-dicarboximides with a solution of potassium permanganate in aqueous acetone gave the corresponding N-aryl-cis-5,6-dihydroxybicyclo[2.2.1]heptane-endo-and-exo-2,3-dicarboximides. The exo,cis,exo and exo,cis,endo configurations of the synthesized compounds were determined by 1H NMR spectroscopy. 相似文献
20.
A. I. Vas’kevich A. V. Bentya V. I. Staninets 《Russian Journal of Organic Chemistry》2009,45(12):1847-1852
Reactions of 6-allylsulfanylpyrazolo[3,4-d]pyrimidin-4(5H)-one with arenesulfenyl chlorides in chloroform gave products of addition of the latter at the exocyclic double bond, while
analogous reactions in acetic acid in the presence of LiClO4 were accompanied by intramolecular electrophilic cyclization involving the N7 atom. 6-Cinnamylsulfanylpyrazolo[3,4-d]pyrimidin-4(5H)-one reacted with arenesulfenyl chlorides in acetic acid in the absence of electrolyte to produce fused pyrazolo[4′,3′: 5,6]pyrimido[2,1-b][1,3]thiazine derivatives. Introduction of a bulky phenyl group into position 1 of the pyrazolo[3,4-d]pyrimidine system reduces the yield of the corresponding intramolecular cyclization product at N7 as a result of concurrent formation of acyclic addition product. DOI 相似文献