Zh. V. Ignatovich

Reductive transformations of Schiff bases in the synthesis of functionally substituted heteroaromatic amines

Schiff bases synthesized by condensation of 5- and 6-aminoquinolines, 5-amino-2-methylquinoline, nitroanilines, and pyrimidinylaminoanilines with substituted benzaldehydes and pyridinecarbaldehydes were reduced with sodium tetrahydridoborate in acetic acid to obtain the corresponding N-aryl(hetaryl)benzylamines, N-(pyridylmethyl)anilines, and N-(1,2,3,4-tetrahydroquinolyl)benzylamine derivatives. The reduction of arylhetarylimines with hydrazine hydrate in the presence of Raney nickel involved only the azomethine C=N bond, while the nitrogen-containing heteroaromatic ring remained intact. Under analogous conditions, nitrosubstituted Schiff bases and benzyl- and pyridylmethylamines were converted into previously unknown N-(aminobenzyl)quinolinamines and aryl(pyridyl)methyl-substituted phenylenediamines.

Synthesis of N-aryl benzamides containing pharmacophoric tyrosine kinase inhibitor fragments

New N-aryl 4-(arylaminomethyl)benzamides containing pharmacophoric heterocyclic fragments have been synthesized from 2-arylaminopyrimidine, 1-methylpiperazine, and morpholine derivatives and substituted benzoic acids.

Synthesis of N-[2(3,4)-aminophenyl]-4-({4-methyl-3-[4-(pyridin-3-yl)pyrimidin-2-ylamino]phenyl}aminomethyl)benzamides

New N-[2(3,4)-aminophenyl]benzamides containing a pharmacophoric 2-(arylamino)pyrimidine fragment have been synthesized from the corresponding substituted benzoic acid.

Functionally substituted Schiff bases in reduction reactions

Functionally substituted Schiff bases obtained by the condensation of nitroaniline, pyrimidinylaminoaniline, 5-aminoquinoline, 5-aminoquinaldine derivatives with 4-methylformylbenzoate were studied in the reactions of sodium borohydride with acidic activators, hydrazine hydrate in the presence of Raney nickel, Raney alloy in the presence of potassium hydroxide. By the reduction of azomethines new benzyl derivatives of aniline, quinolylamine, arylaminopyrimidine, and phenylenediamine were obtained.

Preparative synthesis of heterocyclic and aromatic N-benzyl amines

A simple and highly efficient procedure has been proposed for the synthesis of heterocyclic and aromatic N-benzyl amines via reductive amination of substituted aromatic aldehydes in the presence of sodium tetrahydridoborate-acetic acid system generating reactive sodium triacetoxyhydridoborate.

Synthesis of maleopimaric and citraconopimaric acids N-[3-(pyrimidin-2-yl)aryl]amides

Acylation of 6-methyl-N-[4-(pyridin-3-yl)pyrimidin-2-yl]benzene-1,3-diamine, 4-methyl-N-[4-(pyridin-3-yl)pyrimidin-2-yl]benzene-1,3-diamine, and N-[4-(pyridin-3-yl)pyrimidin-2-yl]benzene-1,3-diamine with maleopimaric and citraconopimaric acid chlorides, with benzotriazolyl maleopimarate afforded N-[3-(pyrimidin-2-yl)aryl]amides of maleopimaric and citraconopimaric acids. By the reaction of substituted N-arylamides of maleopimaric acid with methanesulfonic acid biologically active methanesulfonates were obtained.

Synthesis of new amides of the N-methylpiperazine series

New carboxylic acid amides containing an N-methylpiperazine fragment were synthesized by reactions of 1-methylpiperazine or 3- and 4-(4-methylpiperazin-1-ylmethyl)aniline with 4-chlorobenzoyl chloride and of 4-methyl-3-nitroaniline with 4-(4-methylpiperazin-1-ylmethyl)benzoyl chloride or benzotriazol-1-yl 4-(4-methylpiperazin-1-ylmethyl)benzoate. 4-Chloro-N-[4-(4-methylpiperazin-1-ylmethyl)phenyl]benzamide reacted with imidazole, quinolin-5-amine, and 2-methylquinolin-5-amine to give substituted 4-amino-N-[4-(4-methylpiperazin-1-ylmethyl)phenyl]benzamides. 4-Methyl-3-nitrophenyl-4-methylpiperazin-1-yl-substituted benzamides were reduced with hydrazine hydrate over Raney nickel to obtain N-(3-amino-4-methylphenyl)-4-(4-methylpiperazin-1-ylmethyl)benzamide as key intermediate in the synthesis of antileukemic agent imatinib and its isomer with alternative position of the amide group, 4-[(3-amino-4-methylphenylamino)methyl]phenyl-(4-methylpiperazin-1-yl)methanone.

Condensation of quinolin-6-amine with 5-(p-methoxyphenyl)-cyclohexane-1,3-dione and substituted benzaldehydes

New 12-aryl-9-(p-methoxyphenyl)-8,9,10,12-tetrahydro-7H-benzo[b][4,7]phenanthrolin-11-ones having two asymmetric carbon atoms (C9 and C12) were synthesized by three-component condensation of quinolin-6-amine with 5-(p-methoxyphenyl)cyclohexane-1,3-dione and substituted benzaldehydes. According to the 1H NMR data, the products are mixtures of diastereoisomers.

Interaction of secondary amines with aromatic aldehydes-efficient method for synthesis of the functionalized heterocyclic amines

A method is proposed for the benzylation of secondary heterocyclic amines with functionalized derivatives of benzaldehyde in the presence of formic acid under conditions close to amination according to the Leuckart-Wallach reaction.

Preparative Procedure for the Reduction of Substituted Nitroarenes with Hydrazine Hydrate in the Presence of a Nickel–Cobalt Nanocatalyst

A preparative procedure has been proposed for the reduction of substituted nitroarenes with hydrazine hydrate in the presence of a nanocatalyst based on cobalt–nickel nanoparticles, which ensured selective formation of the corresponding anilines in 78–80% yield in 20–45 min.