Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 10. Isomeric thiazolo[4,5-b]quinoxalines in reactions of N-methylquinoxalinium ions with dithiocarbamates

The cyclization of N-methylquinoxalinium iodide with ammonium salts of N-alkyl-dithiocarbamic acids in DMSO leads to 4-methyl-2,3,3a,4,9,9a-hexahydrothiazolo-[4,5-b]quinoxalines, whereas regioisomeric cycloadducts with a reversed orientation of the thiazole ring are formed in ethanol in the presence of diethylamine.See [1] for communication 9.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 680–685, May, 1984.     

Research in the chemistry of heterocyclic quinoneimines. 4. Effect of mode of activation of the reagents on the reaction of 3-phenothiazinone with alkanethiols

2-Alkylthio- and 2,4-dialkylthio-3-phenothiazinones were obtained in the case of activation of 3-phenothiazinone in reactions with alkanethiols. Activation of the reagent by means of a charge accelerates the reaction significantly and is accompanied by the additional formation of 1,2-dialkylthio-3-phenothiazinones.See [1] for Communication 3.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 334–337, March, 1984.     

Condensation of unsaturated cyclic sulfones with aldehydes

The reactivity of the 2(5) positions of dihydrothiophene dioxide has been studied. Their condensation with aldehydes leads to the formation of 2(5)-substituted derivatives containing a conjugated system of double bonds.     

A new approach to the synthesis of fluorinated chromones

The condensation of two molecules of ethyl pentafluorobenzoylacetate gives 1-oxo-3-penta fluorophenyl-1H-pyrano[4,3-b]6,7,8,9-tetrafluorochromone.Department of Fine Organic Synthesis, Institute of Organic Chemistry, Urals Branch, Russian Academy of Sciences, 620219 Ekaterinburg. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 9, pp. 2186–2188, September, 1992.     

Oxidative aminoarylation of acridines

A method is described for the oxidative aminoarylation of protic and quaternary salts of acridine in the presence of air oxygen; the reaction gives high yields of diverse aminoarylacridines.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 653–654, May, 1971.     

Mechanism of the reaction of arylamines with acridines in the presence of sulfur

The mechanism of the aminoarylation of acridines in the presence of sulfur was investigated. It was established that the process takes place in two steps: formation of an intermediate arylamine-acridine complex and oxidative dehydrogenation of the complex by sulfur. The second step probably is accomplished via an ionic mechanism.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1674–1677, December, 1970.     

Reaction of acridine proton salts with arylamines in the presence of sulfur

The reaction of acridine proton salts with arylamines in the presence of sulfur was studied. It is shown that various arylamines of the benzene and naphthalene series, both free and substituted, form the corresponding aminoarylacridines in high yields in this reaction.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 112–114, January, 1971.     

Supramolecular systems formed by calix[4]resorcinarenes and surfactants in chlorophorm

Capacity titration and ¹H NOESY 2D NMR were applied to investigation of intermolecular interactions and aggregation of amphiphilic calix[4]resorcinarenes (CRA 1, 2) modified with 1,2,4-triazine (1) and oxazine (2) functions in chloroform in the presence of cationic (3) and non-ionic (4) surfactants (SAA). Critical concentrations of micelle formation (CMC) indicate that the ability of CRA 1, 2 to form supramolecular aggregates like micelles or hybrid micelles with SAA 3, 4 only weakly depends on the constitution of CRA functional groups. In the case of the hybrid micelles, when CMC are defined by the nature of surfactants 3 or 4, the methyl and methylene groups of the hydrophobic fragments (CRA 1, 2) were found to interact with the hydroxy groups of SAA 3 and ethylene oxide moieties of SAA 4.