Victor B. Rybakov

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An indirect immunoassay for the determination of vitamin B2 in food samples and vitamin tablets was developed. A carbodiimide-modified active ester method was used to synthesize the immunogen for vitamin B2. The coupling ratio of vitamin B2 to carrier protein in immunogen was 19.98:1. The titer of the polyclonal antibody was 1:64000, and the antibody showed(More)
A convenient general approach to 2-(pyrazol-4-yl)- and 2-(isoxazol-4-yl)ethanols based on the Brønsted acid-initiated reaction of 3-acyl-4,5-dihydrofurans with hydrazines or hydroxylamine was developed. Further transformation of the alcohol moiety in 2-(pyrazolyl)ethanols affording 2-(pyrazolyl)ethylamine as potent bioactive compounds as well as(More)
The title compound, C(17)H(17)N(5)O, exists in the zwitterionic form with the amide group deprotonated. The mean planes of the 1,2,4-triazole and N-phenyl rings form a dihedral angle of 39.14 (8)°. The N atom of the amino group adopts a trigonal configuration. Inter-moleculat C-H⋯O and C-H⋯N hydrogen bonds occur. In the crystal, mol-ecules are linked into a(More)
The title compound, C(13)H(11)N(3)O, a potential chemotherapeutic agent, contains a essential planar [maximum deviation = 0.0144 (14) Å] quinoline moiety. The quinoline ring system and the five-membered heterocycle form a dihedral angle of 7.81 (6)°. In the crystal, inter-molecular non-classical C-H⋯N hydrogen bonding is present.
Tetraspiro[2.1.2(5).1.2(9).1.2(13).1(3)]hexadecane-1,3,5,7-tetraone 4, a unique tetraketone containing a cyclooctane core and four spiroannelated cyclopropane moieties, represents the previously unknown cyclotetramer of carbonylcyclopropane. For this purpose oxidation of the parent polyspirocyclic hydrocarbon was examined under various oxidative conditions,(More)
The title compound, C(13)H(12)BrNO(4), was obtained from an optically active aniline derivative. The structure was characterized by (1)H NMR, (13)C NMR, MS and X-ray diffraction techniques. 86% of the atoms of the two independent mol-ecules in the asymmetric unit show non-crystallographic inversion symmetry.
The acid-catalyzed condensation between 2-aminosubstituted [1,2,4]triazolo[1,5-a]pyrimidines and their analogues with various saturation of the pyrimidine ring and 1,3-diketones or 1,1,3,3-tetramethoxypropane was evaluated as a new approach for the synthesis of diversely substituted polycyclic derivatives of triazolopyrimidine. The reaction of(More)
0040-4039/$ see front matter 2012 Elsevier Ltd. A doi:10.1016/j.tetlet.2012.01.039 ⇑ Corresponding author. Tel./fax: +7 495 9393969. E-mail address: (E.B. Ave Revised regiochemistry for the heterocyclization of electrophilic alkenes with tetranitromethane (TNM) in the presence of triethylamine, providing rapid access to(More)
A conceptually new type of donor-acceptor cyclopropane reactivity towards nucleophiles has been disclosed. An essential characteristic of the process is an unusual nucleophilic attack on the C(3)-position of a cyclopropane, combined with typical small ring-opening by cleavage of the C(1)-C(2) bond between the acceptor and the donor. Based on this new(More)
Quo vadis? The Lewis acid catalyzed reaction of (hetero)aryl-derived donor-acceptor cyclopropanes with alkenes can be selectively directed along a [3+2] annulation pathway (see scheme). This new process provides convenient and efficient access to indanes and other cyclopentannulated (hetero)arenes, among which polyoxygenated 1-arylindanes exhibit(More)