Zobrazeno 1 - 10 of 117 pro vyhledávání: '"N. A. Keiko"'
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α,β‐Unsaturated Aldehydes in the Synthesis of Five‐Membered Heterocyclic Compounds with One Heteroatom: Recent Advances from Developments in Metal‐ and Organocatalysis
Autor: N. A. Keiko, N. V. Vchislo
Publikováno v: Asian Journal of Organic Chemistry. 5:439-461
The ever-increasing interest in the chemistry of five-membered heterocyclic compounds is due to their paramount importance in such essential fields as pharmacology, medicine, biology, organic synthesis of fine chemicals, agricultural chemistry, and t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a68cabdf7317f644e395c777f1f1cc77
https://doi.org/10.1002/ajoc.201600010
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4
ChemInform Abstract: α,β-Unsaturated Aldehydes in the Synthesis of Five-Membered Heterocyclic Compounds with One Heteroatom: Recent Advances from Developments in Metal- and Organocatalysis
Autor: N. V. Vchislo, N. A. Keiko
Publikováno v: ChemInform. 47
The ever-increasing interest in the chemistry of five-membered heterocyclic compounds is due to their paramount importance in such essential fields as pharmacology, medicine, biology, organic synthesis of fine chemicals, agricultural chemistry, and t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::516b3138b4131472872df3e69b17feab
https://doi.org/10.1002/chin.201624260
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5
Methylglyoxal bis-(N,N-dimethylhydrazone): Synthesis and some reactions
Autor: Lyudmila I. Larina, Kirill A. Chernyshev, Nadezhda V. Vchislo, N. A. Keiko
Publikováno v: Russian Journal of General Chemistry. 82:77-81
Methods were proposed for the synthesis of the methylglyoxal 1,2-bis-(N,N-dimethylhydrazone). A possibility was shown for the first time of its participation in the Diels-Alder reaction with maleic anhydride as an electron-rich diene. The second reac
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cc856a5e9b850224ffb3d523637206a6
https://doi.org/10.1134/s1070363212010124
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6
Regioselectivity of the hydrolysis of 2-(1-alkoxyvinyl)-substituted imidazolidines, 1,3-thiazolidines, and 1,3-oxazolidines
Autor: Nadezhda V. Vchislo, N. A. Keiko, E. A. Funtikova, Lyudmila I. Larina, Yu. L. Frolov
Publikováno v: Russian Journal of Organic Chemistry. 47:1832-1840
2-(1-Alkoxyvinyl)-1,3-thiazolidines reacted with H2O or D2O in the presence of 105 mol % of p-toluenesulfonic acid or trifluoroacetic acid (20°C, 1 h) to give 2-acetyl-1,3-thiazolidine in quantitative yield. 2-(1-Alkoxyvinyl)-3,5-diphenylimidazolidi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::965f5c6d327529fb55a563c6f592f941
https://doi.org/10.1134/s1070428011120098
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7
Condensation of 2-alkoxypropenals with N,N- and N,O-1,2-binucleophiles. A route to 2-(1′-alkoxyvinyl)imidazo-lidines and -oxazolidines
Autor: Yu. A. Chuvashev, Lyudmila I. Larina, N. A. Keiko, L. G. Stepanova, Nadezhda V. Vchislo, E. A. Funtikova
Publikováno v: Chemistry of Heterocyclic Compounds. 44:1466-1471
Condensation of 2-ethoxypropenal with diaminoethylene in different solvents (CHCl3, MeCN, H2O, DMSO) at room temperature gives an equilibrium mixture (1:1–1.5) of tautomeric 2-(1′-ethoxyvinyl)-1,3-imidazolidine and 2-aminoethylimine of 2-ethoxypr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1a4ea49ceab92dfaa27da2004d34fb70
https://doi.org/10.1007/s10593-009-0213-y
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8
Synthesis of 2,5-bis(butylsulfanyl)-2,3-dihydro-4H-pyran-2-carbaldehyde acetals and their unexpected isomerization
Autor: N. A. Keiko, E. A. Kleptsova, L. G. Stepanova, Yu. A. Chuvashev, Lyudmila I. Larina
Publikováno v: Russian Journal of Organic Chemistry. 44:1558-1561
2,5-Bis(alkylsulfanyl)-2,3-dihydro-4H-pyran-2carbaldehydes exhibit bacteriostatic effect [1]. 2,5-Bis(butylsulfanyl)-2,3-dihydro-4H-pyran-2-carbaldehyde is known as a strong and safe antiseptic [2]. We examined its reactions with alcohols in order to
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::85424c119911b528981f93f62a2c0aae
https://doi.org/10.1134/s107042800810031x
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9
Synthesis of new 5-substituted hydantoins from 2-alkoxy-1-cyano-1-trimethylsiloxypropenes
Autor: N. A. Keiko, Yu. A. Chuvashev, Tatiana Kuznetsova, M. G. Voronkov, Nadezhda V. Vchislo, Lyudmila I. Larina
Publikováno v: Russian Journal of General Chemistry. 77:2145-2149
Synthetic procedures for preparing previously unknown 5-(1′-alkoxyethylidene)hydantoins from 2-alkoxy-1-cyano-1-trimethylsiloxy-1-(or -2-)propenes by one-pot successive reactions with ethanol and (NH4)2CO3 are developed. Some intermediates, reactio
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::06a234fd65b0e74dcc1217d25afdd4cb
https://doi.org/10.1134/s1070363207120122
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10
2-(1′-alkoxyvinyl) thiazolidines: synthesis and study of ring-chain tautomerism
Autor: Ludmila I. Larina, Yurii A. Chuvashev, E. A. Funtikova, Michail G. Voronkov, Ludmila G. Stepanova, N. A. Keiko
Publikováno v: Journal of Sulfur Chemistry. 25:351-357
2-Alkoxypropenals react with 2-aminoethanethiol to yield mixtures of tautomeric 2-(1-alkoxyvinyl)thiazolidines and imino thiols. The ring-chain tautomeric equilibria, studied by 1H NMR spectroscopy, were strongly dependent on the solvent polarity, ra
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::90773fb0a6d9b33d6fe7df5befcf581b
https://doi.org/10.1080/17415990413312317937
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