Zoya V. Voitenko

Conversions of 2-(2-Oxo Cyclohexylcarbonyl)Benzoic Acid Derivatives to Pyrazolo[ [5] , [1] , [2] , [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] ]Isoindole and Pyrimidine Rings

Abstract Phtalic acid derivative of o-methylcarboxybenzoylchloride readily acylates N(1-cyclohexenyl) morpholine and is likely to acylate other enamines along the classic path to 1,3-diketones. It is a convenient route towards o-(1-(1,3-diketone)) derivatives of benzoic acid, which are precursors of o-(heteroaryl)-benzoic acids. Further conversions with hydrazines and amidines lead to pyrazolo[ [5] , [1] , [2] , [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] ]isoindole and pyrimidine rings respectively. The structures of the obtained compounds were confirmed by X-ray structure determinations.

Synthesis of novel tricyclic derivatives of 7-azabenzonorbornene system

Abstract The reaction of 6-methyl-5,6-dihydroisoindolo[2,1-a]quinazolin-5-one with maleinimides in the ratio 1:2 was investigated. The products of the reaction were tricyclic derivatives of 7-azabenzonorbornene system 2-methyl-20-R-11-(1-R-2,5-dioxotetrahydro-1H-3-pyrrolyl)-2,10,20-triazahexacyclo[9.6.5.01,10.04,9.012,17.018,22]docosa-4(9),5,7,12,14,16-hexaene-3,19,21-trione. Their structure was established by the X-ray analysis, and a probable mechanism of the reaction is considered.

IR spectroscopic study of the reactivity of aromatic 5-acyltetrazoloisoindoles

Abstract An IR study of the 5-acyl tetrazoloisoindoles solvent sensitive bands permit to assign the bands associated to the valence mode of the CO bond in the 1700–1500 cm −1 area. This provides an explanation of the unusual stability of these newly synthesised compounds. Moreover, in air exposed solutions we observe the formation of unique degradation products. A mechanism for their formation and their probable structure was proposed with the help of IR spectroscopy.

Synthesis of thiacalix[4]arene task-specific ionic liquids

GRAPHICAL ABSTRACT ABSTRACT The preparative methods for the synthesis of imidazolium and pyridinium room temperature task-specific ionic liquids possessing thiacalix[4]arene complexing groups in cationic or anionic fragments of the molecule are described. The cationic imidazolium and pyridinium derivatives of tetrabuthoxythiacalixarene existing in the conformation 1,3-alternate are capable to bind “soft” metal cations due to cooperative cation-π and ion–dipole interactions with spatially contiguous benzene rings and oxygen atoms of the thiacalixarene platform. The cone-shaped imidazolium salts of the tetrahydroxythiacalix[4]arene sulfonic acid can chelate cations of transition metals, lanthanides, and actinides by oxygen and sulfur atoms at the lower rim of macrocycle.

3-Carbamoyl-2,2-dimethyl-cyclo-pentane-1,1-dicarb-oxy-lic acid.

In the title compound, C10H15NO5, the five-membered cyclopentane ring has an envelope conformation, with four atoms lying in a plane (mean deviation = 0.0213 Å), while the fifth atom deviates from this plane by 0.626 (2) Å. A three-dimensional structure is formed through N—H⋯O and O—H⋯O hydrogen bonds between the amide and carboxylic acid groups and both carboxylic acid and amide O-atom acceptors.