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Общее количество найденных документов : 39
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1.

Вид документа : Статья из журнала
Шифр издания : 54/G 90
Автор(ы) : Gruzdev D.A., Levit G. L., Krasnov V. P.
Заглавие : Acylative kinetic resolution of racemic heterocyclic amines using N-phthaloyl-(S)-amino acyl chlorides with alkyl side chains
Место публикации : Tetrahedron: Asymmetry . - 2012. - Vol.23. - С. 1640-1646
Примечания : Bibliogr.: p. 1645-1646 (15 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): heterocyclic amines --racemic amines--acyl chlorides
Аннотация: A comparative study of the acylative kinetic resolution of racemic 2-methyl-1,2,3,4 tetrahydroquinoline and 3,4-dihydro-3-methyl-2H-[1,4]benzoxazine using N-phthaloyl-(S)-amino acyl chlorides with alkyl side chains has been carried out. The influence of steric factors on the stereoselectivity of the acylation was demonstrated. The (S)-enantiomers of the heterocyclic amines (ee 99%) were obtained in good yields via a kinetic resolution protocol using N-phthaloyl-(S)-leucyl chloride
\\\\expert2\\NBO\\Tetrahedron Asymmetry\\2012, v. 23, p.1640.pdf
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2.

Вид документа : Статья из журнала
Шифр издания : 54/A 10
Автор(ы) : Gruzdev D.A., Chulakov E.N., Levit G. L., Ezhikova M. A., Kodess M. I., Krasnov V. P.
Заглавие : A comparative study on the acylative kinetic resolution of racemic fluorinated and non-fluorinated 2-methyl-1,2,3,4-tetrahydroquinolines and 3,4-dihydro-3-methyl-2H-[1,4]benzoxazines
Место публикации : Tetrahedron: Asymmetry . - 2013. - Vol.24, №19. - С. 1240-1246
Примечания : Bibliogr. : p. 1246 (21 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): racemic fluorinated --1,2,3,4-tetrahydroquinolines--benzoxazines
Аннотация: The acylative kinetic resolution of racemic 6-fluoro-2-methyl-1,2,3,4-tetrahydroquinoline, 7,8-difluoro-3,4-dihydro-3-methyl-2H-[1,4]benzoxazine, and their non-fluorinated analogues with (S)-naproxen and N-phthaloyl-(S)-amino acyl chlorides has been carried out. It has been shown that the presence of fluorine atoms in the aromatic fragment of a heterocyclic amine results in the increasing stereoselectivity of acylation with (S)-naproxen acyl chloride and in a decrease in the efficiency of acylative kinetic resolution using N-phthaloyl-(S)-amino acyl chlorides. A method for the preparation of enantiopure (S)-6-fluoro-2-methyl-1,2,3,4-tetrahydroquinoline (ee 99%) was developed
\\\\expert2\\NBO\\Tetrahedron Asymmetry\\2013, in Press, Corr. Proof, 4 Sept.pdf
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3.

Вид документа : Статья из журнала
Шифр издания : 54/N 10
Автор(ы) : Gruzdev D.A., Vakarov S. A., Levit G. L., Krasnov V. P.
Заглавие : N-Tosyl-(S)-Prolyl Chloride in Kinetic Resolution of Racemic Heterocyclic Amines
Место публикации : Chemistry of Heterocyclic Compounds. - 2014. - Article in Press. - С. 1-13
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): h-[1,4]benzoxazine--acylation--amines
Аннотация: The kinetic resolution of racemic heterocyclic amines via acylation with N-tosyl-(S)-prolyl chloride was systematically investigated. It was established that racemic mixtures of aromatic amines could be resolved with high efficiency, while the acylation of 2- and 3-methylpiperidines occurred with low diastereoselectivity. A method for the preparation of enantiomerically pure (3 R)-7,8-difluoro-3-methyl-3,4-dihydro-2 H-[1,4]benzoxazine was developed
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4.

Вид документа : Статья из журнала
Шифр издания : 54/K 81
Автор(ы) : Krasnov V. P., Gruzdev D.A., Levit G. L.
Заглавие : Nonenzymatic Acylative Kinetic Resolution of Racemic Amines and Related Compounds
Место публикации : European Journal of Organic Chemistry. - 2012. - Vol.2012, №8. - С. 1471-1493
Примечания : Bibliogr. : p. 1491-1493 (76 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): kinetic resolution--acylation--amines--amides
Аннотация: Acylative kinetic resolution of racemic amines occupies a highly important place among the methods for preparation of enantio enriched or pure amines. Nonenzymatic acylative kinetic resolution is usually carried out in the presence of chiral acyl-transfer catalysts or under the action of chiral enantio- or diastereoselective resolving agents. Recently, this line of investigations has been rapidly developed and very interesting results of design and synthetic application of both new catalysts and chiral acylating agents have been obtained. This microreview summarizes the recent advances in this area.
\\\\expert2\\NBO\\European Journal of Organic Chemistry\\2012, p.1471.pdf
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5.

Вид документа : Статья из журнала
Шифр издания : 54/U 52
Автор(ы) : Bolgova A. I., Lugovik K. I., Subbotina J.O., Slepukhin P. A., Bakulev V. A., Belskaia N. P.
Заглавие : Unexpected result for the acylation of arylhydrazonoethanethioamides
Место публикации : Tetrahedron. - 2013. - Vol.69, №35. - С. 7423-7429
Примечания : Bibliogr. : p. 7429 (18 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): arylhydrazonoethanethioamides--amino groups--acylthioamides
Аннотация: The acylation of arylhydrazonoethanethioamides containing primary amino group did not yield acylthioamides as expected. Surprisingly, the cyclic 5-acylimino-2,5-dihydro-1,2,3-thiadiazoles were obtained. The formation of thiadiazoles in this reaction was explained by the higher ability of arylhydrazono-N-acylthioacetamide intermediates to be oxidized comparing to their precursors. The presence of pseudobicyclic aromatic structure in the reaction product was a main factor favoring the formation of 1,2,3-thiadiazole ring
\\\\expert2\\NBO\\Tetrahedron\\2013, v. 69, p. 7423.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 54/F 62
Автор(ы) : Konovalova V. V., Shklyaev Yu. V., Slepukhin P. A., Maslivets A. N.
Заглавие : Five-membered 2,3-dioxo heterocycles: LXXVIII. Acylation of fischer's base with aroylketenes. Crystalline and molecular structure of (1E, 3Z)-4-(4-chlorophenyl)-4-hydroxy-1-(1,3,3-trimethyl-2,3-dihydro-1H-indol-2-ylidene)but-3-en-2-one [Electronic resource]
Место публикации : Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2011. - Vol. 47, № 7. - С. 1062-1065
Систем. требования: http://www.springerlink.com/content/u75m7g32w6mj7v67/fulltext.pdf
Примечания : Bibliogr. : p. 1065 (11 ref.). - 1.11.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Aroylketenes generated by thermolysis of 6-aryl-2,2-dimethyl-4H-1,3-dioxin-4-ones reacted with 1,3,3-trimethyl-2-methylidene-1,3-dihydro-2H-indole (Fischer's base) to produce (1E,3Z)-4-aryl-4-hydroxy-1-(1,3,3-trimethyl-1,3-dihydro-2H-indol-2-ylidene)but-3-en-2-ones. The crystalline and molecular structures of (1E,3Z)-4-(4-chlorophenyl)-4-hydroxy-1-(1,3,3-trimethyl-2,3-dihydro-1H-indol-2-ylidene)but-3-en-2-one were determined by X-ray analysis
\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2011, 47 (7), 1062.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 54/S 91
Автор(ы) : Levit G. L., Gruzdev D.A., Krasnov V. P., Chulakov E.N., Sadretdinova L. Sh., Ezhikova M. A., Kodess M. I., Charushin V. N.
Заглавие : Substituent effect on the stereoselectivity of acylation of racemic heterocyclic amines with N-phthaloyl-3-aryl-(S)-alanyl chlorides
Место публикации : Tetrahedron: Asymmetry . - 2011. - Vol. 22, № 2. - С. 185-189
Примечания : Bibliogr. : p. 189 (17ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The acylative kinetic resolution of racemic 2-methyl-1,2,3,4-tetrahydroquinoline and 2,3-dihydro-3-methyl-4H-1,4-benzoxazine using acyl chlorides of N-phthaloyl-(S)-phenylalanine, N-phthaloyl-3-(4-nitrophenyl)-(S)-alanine and N-phthaloyl-O-methyl-(S)-tyrosine as chiral resolving agents has been carried out. It is shown that the effectiveness of an acylative kinetic resolution depends on the electronic effects of substituents in the phenyl fragment of the acylating agent and increases as the electron-donating properties of the para-substituent (OMe H NO2) in phenyl fragment of N-phthaloyl-3-aryl-(S)-alanyl chlorides increase; conducting the process at a reduced temperature also contributes to an enhancement of the kinetic resolution
\\\\Expert2\\nbo\\Tetrahedron Asymmetry\\2011, v. 22, p.185.pdf
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8.

Вид документа :
Шифр издания : 54/A 10
Автор(ы) : Bogatishcheva N. S., Yarovenko V. N., Levchenko K.S., Kobeleva O. I., Valova T. M., Barachevskii V. A., Struchkova M. I., Shmelin P. S., Krayushkin M. M., Charushin V. N.
Заглавие : A convenient method for the preparation of mono- and bis-substituted photochromic bis(benzothienyl)perfluorocyclopentenes via regioselective Friedel–Crafts acylation
Место публикации : Tetrahedron Letters. - 2012. - Vol.53, №44. - С. 5948-5951
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): regioselective friedel–crafts acylation--photochrome--benzofurans
Аннотация: The regioselective Friedel–Crafts acylation of 1,2-bis(2-methylbenzo[b]thien-3-yl)hexafluorocyclopentene was developed. Depending on the reaction conditions, mono- or bis(bromoacetyl) derivatives are formed as single products in good yields. Further heterocyclizations involving α-bromoketone moieties gave a series of new photochromic compounds
\\\\Expert2\\nbo\\Tetrahedron Letters\\2012, v. 53, p. 5948.pdf
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9.

Вид документа :
Шифр издания : 54/S 98
Автор(ы) : Gruzdev D.A., Levit G. L., Kodess M. I., Krasnov V. P.
Заглавие : Synthesis of enantiomers of 6-nitro- and 6-amino-2-methyl-1,2,3,4-tetrahydroquinolines
Место публикации : Chemistry of Heterocyclic Compounds. - 2012. - Vol.48, №5. - С. 748-757
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): amides--diastereoisomers--enantiomers
Аннотация: Enantiomers of 2-methyl-6-nitro-1,2,3,4-tetrahydroquinoline have been obtained by kinetic resolution of racemic 2-methyl-1,2,3,4-tetrahydroquinoline in acylation with acyl chlorides of N-protected amino acids followed by regioselective nitration of the diastereoisomeric amides and acidic hydrolysis. The introduction of a trifluoroacetyl protecting group into the position 1 of the enantio pure nitro compound followed by the reduction led to (S)-6-amino-2-methyl-1-trifluoroacetyl-1,2,3,4-tetra-hydroquinoline in a high yield
\\\\Expert2\\nbo\\Chemistry of Heterocyclic Compounds\\2012, v.48, N 5, p.748-757.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 54/R 35
Автор(ы) : Irgashev R. A., Kazin N. A., Kim G. A., Rusinov G. L., Charushin V. N.
Заглавие : Regioselective C2-and C8-Acylation of 5,11-Dihydroindolo[3,2-b]carbazoles and the Synthesis of Their 2,8-Bis(quinoxalinyl) Derivatives [Электронный ресурс]
Место публикации : Synthesis-Stuttgart. - 2015. - Vol. 47, № 22. - С. 3561-3572
Систем. требования: http://apps.webofknowledge.com/
Примечания : Bibliogr. : p. 3572 (11 ref). - 18.01.16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 5,11-dihydroindolo[3,2-b]carbazoles --2-arylgly-oxals--acylation
Аннотация: An efficient approach for the double acetylation of 5,11-dihexyl- 6,12-di(hetero) aryl-substituted 5,11-dihydroindolo[3,2-b] carbazoles with acetic anhydride in the presence of boron trifluoride etherate has been developed, thus affording the corresponding 2,8-diacetyl derivatives in good yields. A similar acylation has been shown to occur by the reaction of anhydrides of other carboxylic acids. Oxidation of the obtained 2,8-diacetyl derivatives with selenium dioxide takes place on heating or under microwave irradiation, thus resulting in the formation of the corresponding 2,8-diglyoxals. The latter proved to react with aromatic o-diamines to afford new indolo[3,2-b] carbazoles bearing quinoxalinyl fragments at C-2 and C-8. Major optical properties of quinoxaline- containing indolo[3,2-b] carbazoles have been measured.
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