K. S. Levchenko

Synthesis and reactivity of 1-aryl-9H-thieno[3,4-b]chromon-9-ones

Methods were developed for the synthesis of 1-aryl-9H-thieno[3,4-b]chromon-9-ones based on the reaction of bromo and dibromo derivatives of 2-methyl-4H-chromon-4-one with thioacetamide in DMF. The thienochromones were modified and their fluorescence properties were studied. Bis(thienochromones) were synthesized by the reaction of thienochromones with ketoaldehydes.

Photochromic and irreversible photofluorescent organic materials for 3D bitwise optical memory

This paper presents latest own results in the development of reversible photochromic and irreversible photofluorescent polymer systems providing fabrication of multilayer recording media for 3D optical memory with super high information capacity. It was shown that synthesized thermal irreversible photochromic diarylethenes into plastic binders allow to prepare photochromic polymer layers providing nondestructive refractive read-out of optical information. These photochromic polymer layers were used for preparation of six-layer recording media tested with the positive results using the framed optical device. This device imitated layer-by-layer writing, erasure and read-out of optical signals. Experimental evidences for making photochromic polymer layers based on a mixture of photochromic diarylethene and dye — phosphor with nondestructive fluorescent read-out are presented too. Polymer systems based on light-sensitive chromones manifest an irreversible photochemical transformations of these non-fluorescing compounds into the fluorescent products under UV irradiation. Received results open perspectives for making multilayer optical discs for bitwise working (based on photochromic systems) and archival (based on irreversible photofluorescent systems) optical memory with information capacity more 1 TB.

Synthesis and modification of light-sensitive 3-acyl-2-hetarylchromones containing bromomethyl group in the acyl fragment

A synthesis of photosensitive 3-acyl-2-hetarylchromones containing bromomethyl group in the 3-aroyl fragment and their further modification by the reactions with N-, S- and O-nucleophiles are described. A dependence of spectral properties from the structure of compounds was studied.

Synthesis of photoactive 2-aroyl-3-furylbenzofurans

Abstract2-Aroyl-3-furylbenzofurans were synthesized by the reaction of α-furoylphenols with α-bromo ketones.

Synthesis of photoactive 5-aroyl-4-furyl-2-(morpholin-4-yl)thiazoles

Abstract5-Aroyl-4-furyl-2-(morpholin-4-yl)thiazoles were synthesized by the reaction of (morpholin-4-ylthiocarbonyl)furan-2-carboxamide with α-bromoketones.

Synthesis of 2-substituted 3-iodo-4H-chromen-4-ones

Abstract3-Iodochromones containing phenyl and furyl fragments at position 2 were synthesized by heterocyclization of β-ketoenamines.

Synthesis of 1,3-thioxoketones from salicylaldehyde

A method for the synthesis of monothiodibenzoylmethanes was developed. The method involves a reaction of potassium thioacetate with 1-(2-hydroxyphenyl)-3-phenylpropynone prepared from salicylaldehyde.

Synthesis of fluorine-containing analogs of ellipticine and other heterocycles from 2-Nitro-and 2-amino-4,5-difluoroanilines

Abstract2-Nitro- and 2-amino-4,5-difluoroanilines were used as starting materials to synthesize fluorine-containing imidazole, oxazole, and indoloquinoxaline derivatives. The latter may be regarded as ellipticine analogs.