Search Results - "Keiko, Natalia A."

One-pot, three-component cascade synthesis of new tetrasubstituted pyrroles by coupling reaction of 2-functionally substituted 2-alkenals, amines, and nitroethane by Keiko, Natalia A., Vchislo, Nadezhda V., Verochkina, Ekaterina A., Larina, Ludmila I.

“…The reactivity of 2-alkylthio(2-alkoxy)-substituted 3-aryl(hetaryl)propenals in a one-pot, three-component reaction with primary amines and nitroethane has…”
Get full text

α,β-Unsaturated aldehydes in the synthesis of pyrroles (microreview) by Keiko, Natalia A., Vchislo, Nadezhda V.

Get full text

Stereospecificity of (1) H, (13) C and (15) N shielding constants in the isomers of methylglyoxal bisdimethylhydrazone: problem with configurational assignment based on (1) H chemical shifts by Afonin, Andrei V, Pavlov, Dmitry V, Ushakov, Igor A, Keiko, Natalia A

“…In the (13) C NMR spectra of methylglyoxal bisdimethylhydrazone, the (13) C-5 signal is shifted to higher frequencies, while the (13) C-6 signal is shifted to…”
Get full text

Synthesis and properties of alkylthioethanals by Keiko, Natalia A., Stepanova, Ludmila G., Verochkina, Ekaterina A., Chuvashev, Yurii A.

Get full text

Synthesis and several properties of 2-alkoxy- and 2-alkylthio-3-aryl(hetaryl)propenals by Keiko, Natalia A., Stepanova, Ludmila G, Verochkina, Ekaterina A, Larina, Ludmila I

Get full text

Unexpected one-flask synthesis of 2,4-dialkylthiopentanedials via the reaction of alkylthioacetic aldehydes with dihalomethane and diethylamine by Keiko, Natalia A., Stepanova, Ludmila G., Verochkina, Ekaterina A., Larina, Ludmila I., Chuvashev, Yurii A.

Get full text

Synthesis of imidazo[1,2-a]pyridines from α,β-unsaturated aldehydes (microreview) by Keiko, Natalia A., Vchislo, Nadezhda V.

“…Methods of synthesis of imidazo[1,2- a ]pyridines from α,β-unsaturated aldehydes, including α-acetylene aldehydes, and 2-aminopyridine, published during the…”
Get full text

[beta]-Unsaturated aldehydes in the synthesis of pyrroles by Keiko, Natalia A, Vchislo, Nadezhda V

Get full text

Synthesis of imidazo[1,2-a]pyridines from [alpha],[beta]-unsaturated aldehydes by Keiko, Natalia A, Vchislo, Nadezhda V

“…Methods of synthesis of imidazo[1,2-a]pyridines from [alpha],[beta]-unsaturated aldehydes, including [alpha]-acetylene aldehydes, and 2-aminopyridine,…”
Get full text

2-Alkoxy- and 2-alkylthio-2-alkenals in the reactions of electrophilic and nucleophilic addition. DFT study and NBO analysis by Keiko, Natalia A., Aksamentova, Tamara N., Chipanina, Nina N., Verochkina, Ekaterina A., Vchislo, Nadezhda V.

“…A DFT approach at B3LYP/6-311+G∗∗ and M06/6-311+G∗∗ levels of theory, and natural bond orbital (NBO) analysis were used to investigate the electron…”
Get full text

Hydrolysis of (Z)-2-alkoxy-3-arylpropenals as a short-cut to benzylglyoxals by Keiko, Natalia A., Vchislo, Nadezhda V., Verochkina, Ekaterina A., Chuvashev, Yurii A., Larina, Lyudmila I.

“…[Display omitted] Hydrolysis of the C=C bond in 2-alkoxy-3-aryl(hetaryl)-propenals, depending upon substituents in the molecule, can proceed according to…”
Get full text

Stereospecificity of 1 H, 13 C and 15 N shielding constants in the isomers of methylglyoxal bisdimethylhydrazone: problem with configurational assignment based on 1 H chemical shifts by Afonin, Andrei V., Pavlov, Dmitry V., Ushakov, Igor A., Keiko, Natalia A.

“…In the 13 C NMR spectra of methylglyoxal bisdimethylhydrazone, the 13 C‐5 signal is shifted to higher frequencies, while the 13 C‐6 signal is shifted to lower…”
Get full text

Stereospecificity of 1H, 13C and 15N shielding constants in the isomers of methylglyoxal bisdimethylhydrazone: problem with configurational assignment based on 1H chemical shifts by Afonin, Andrei V., Pavlov, Dmitry V., Ushakov, Igor A., Keiko, Natalia A.

“…In the 13C NMR spectra of methylglyoxal bisdimethylhydrazone, the 13C‐5 signal is shifted to higher frequencies, while the 13C‐6 signal is shifted to lower…”
Get full text

N,N-Disubstituted α-Amino-α,β-unsaturated Aldehydes and their Derivatives:1H and13C NMR Study by Rulev, Alexander Yu, Mokov, Alexander S., Krivdin, Leonid B., Keiko, Natalia A., Voronkov, Mikhail G.

Get full text

N,N-Disubstituted α-Amino-α,β-unsaturated Aldehydes and their Derivatives: 1H and 13C NMR Study by Rulev, Alexander Yu, Mokov, Alexander S., Krivdin, Leonid B., Keiko, Natalia A., Voronkov, Mikhail G.

“…1H and 13C NMR spectra of N,N‐disubstituted α‐amino‐α,β‐unsaturated aldehydes and their azomethines and enammonium salts were studied. The spectra reflect the…”
Get full text