Esters of isoxazole- and isothiazolecarboxylic acids and oximes of β-isatin, isoxazole- and ferrocene-containing ketones and carborane alcohols

Oximes of β-isatin, isoxazole- and ferrocene-containing ketones, o- and m-carborane alcohols react with isoxazol- and isothiazolecarboxylic acid chlorides in the presence of triethylamine to afford the corresponding esters.     

Synthesis of 2-R-1,3-dioxanes, derivatives of functionally substituted aldehydes of vanillin series

By the condensation of substituted aldehydes of vanillin series with 1,3-propanediol in boiling benzene in the presence of sulfo cation exchanger FIBAN K-1 as catalyst functionally 2-R-substituted 1,3-dioxanes were synthesized.     

Synthesis of functionally substituted isoxazole and isothiazole derivatives

Acylation of benzene and toluene with 5-phenyl- and 5-(p-tolyl)isoxazole-3-carbonyl chlorides gave 5-phenyl(or p-tolyl)isoxazol-3-yl phenyl(or p-tolyl)ketones which were reduced to the corresponding alcohols with sodium tetrahydridoborate in propan-2-ol. Selective reduction of the carboxy group in 4,5-dichloroisothiazole-3-carboxylic acid was achieved by the action of BH₃, and the aldehyde group in 4-formyl-2-methoxyphenyl 5-arylisoxazole-3-carboxylates and 4,5-dichloroisothiazole-3-carboxylates was reduced to hydroxymethyl group with sodium triacetoxyhydridoborate in benzene. Acylation of the resulting hydroxymethyl derivatives with 5-arylisoxazole- and 4,5-dichloroisothiazole-3-carbonyl chlorides afforded the corresponding esters containing two azole fragments in their molecules.     

Preparative synthesis of 1,2-propyleneglycolacetals of 3-alkoxy-4-acyloxybenzaldehydes

The article describes a preparative method for the synthesis of new 1,2-propyleneglycolacetals of 3-alkoxy-4-acyloxy-benzaldehydes obtained by condensation of 3-alkoxy-4-acyloxybenzaldehydes with 1,2-propylene glycol in the medium of boiling benzene in the presence of the FIBAN K-1 sulfonic cation-exchange resin.     

Preparative synthesis of veratraldehydeoxime esters

Preparative syntheses of veratraldehydeoxime esters 6–24, available fragrances produced from vanillin (1), in 82–92% yield from veratraldehydeoxime (3) were developed. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 558–560, November–December, 2008.     

Synthesis and structure—aroma correlation of anisaldehyde oxime esters

Preparative syntheses from anisaldehyde 1 of the anti-isomer of anisaldehyde oxime 2 and anisaldehyde oxime esters 3a-q in 84-93% yields were developed. The structure—aroma correlation of 2 and 3a-q was studied. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 131-134, March-April, 2009.     

Kantorovich’s Fixed Point Theorem and Coincidence Point Theorems for Mappings in Vector Metric Spaces

Set-Valued and Variational Analysis - The fixed points and coincidence points of mappings of v-metric spaces, i.e., sets on which a vector metric is defined, are investigated. The values of such a...