G. A. Gazieva

Oxoindolinylidene Derivatives of Thiazolidin-4-ones: Methods of Synthesis and Biological Activity (Review)

We offer a review on synthetic methods and biological activity data for oxoindolinylidene derivatives of thiazolidin-4-ones, including heteroannelated examples of such compounds, published between 1967 and 2014.

α-Thioureidoalkylation of functionally substituted ureas: I. Tandem cyclization and esterification in reactions of N-(carboxyalkyl)ureas with 1,3-dialkyl-4,5-dihydroxy-4,5-diphenylimidazolidine-2-thiones in alcohols

Acid-catalyzed reactions of N-(carboxyalkyl)ureas with 1,3-dialkyl-4,5-dihydroxy-4,5-diphenylimidazolidine-2-thiones in methanol or propan-2-ol led to the formation of previously unknown ω-(4,6-dialkyl-2-oxo-3a,6a-diphenyl-5-thioxooctahydroimidazo[4,5-d]imidazol-1-yl)alkanoic acids and their methyl and isopropyl esters. The structure of some esters was proved by X-ray analysis. Methyl (4,6-diethyl-2-oxo-3a,6adiphenyl-5-thioxooctahydroimidazo[4,5-d]imidazol-1-yl)acetate showed anxiolytic effect.

Ring contraction of 1,2,4-triazine derivatives in the synthesis of imidazoles

The review systematizes the data on the reactions of 1,2,4-triazines proceeding with a triazine ring contraction to the imidazole one. Imidazole derivatives are obtained upon treatment of 1,2,4-triazines of different saturation degree with reducing agents, oxidants, acids, as well as with the agents initiating tandem reactions, the last step of which is a triazine ring contraction, for example, nitrosating and aminating agents, organometallic compounds and aromatic aldehydes.

Diastereoselective synthesis of 4,5-dihydroxyimidazolidin-2-ones (-thiones) and their structure

Studies on the synthesis of 4,5-dihydroxyimidazolidin-2-ones (-thiones) based on the condensation of ureas or thioureas with glyoxal or 1,2-dioxo-1,2-diphenylethane showed high diastereoselectivity in the formation of racemates (trans-diastereomers) of 4,5-dihydroxyimidazolidin-2-ones (-thiones) and meso-forms (cis-diastereomers) of 4,5-dihydroxy-4,5-diphenyl-1,3-dialkylimidazolidine-2-thiones; plausible mechanisms of their formation were suggested. X-ray diffraction studies confirmed structures of diastereomers for separate examples of racemates and meso-forms of 4,5-dihydroxyimidazolidin-2-ones (-thiones).

Crystal structure, IR and 1H NMR spectra of tetranitratobis μ-(2,4,6,8-tetraethyl-2,4,6,8-tetraazabicyclo[3.3.0]octane-3,7-dione-O,O′)]diethanolodicadmium

The crystal structure of [Cd2(μ-BC)2(NO3)4(EtOH)2] (I), where BC is C12H22N4O2 (bicaret), has been determined. The crystals are composed of dimeric centrosymmetrical molecules. The cadmium coordination polyhedron is a trigonal bipyramid. Bicaret is a bidentate bridging ligand coordinated to the metal through two oxygens of the carbonyl groups. The IR and 1H NMR spectra of I are studied and interpreted.

An effective one-pot access to polynuclear dispiroheterocyclic structures comprising pyrrolidinyloxindole and imidazothiazolotriazine moieties via a 1,3-dipolar cycloaddition strategy

An effective and highly regio- and diastereoselective one-pot method for the synthesis of new polynuclear dispiroheterocyclic systems with five stereogenic centers (dispiro[imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-6,3′-pyrrolidine-2′,3′′-indoles]) comprising pyrrolidinyloxindole and imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine moieties has been developed. The method relies on a 1,3-dipolar cycloaddition of azomethine ylides generated in situ from isatin derivatives and sarcosine to 6-benzylideneimidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-2,7-diones.

Synthesis of imidazo[4,5-e]thiazolo[2,3-c]-1,2,4-triazine-2,8-diones via a rearrangement of imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-2,7-diones in the reaction with isatins

An aldol condensation/skeletal rearrangement protocol for the synthesis of 1,3-dialkyl-7-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)-1,3a,4,9a-tetrahydroimidazo[4,5-e]thiazolo[2,3-c]-1,2,4-triazine-2,8(3H,7H)-diones in good to high yields via a one-pot reaction of 1,3-dialkyl-3,3a,9,9a-tetrahydroimidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-2,7(1H,6H)-diones and 1H-indole-2,3-diones (isatins) or through the generation and rearrangement of 1,3-dialkyl-6-(2-oxo-1,2-dihydro-3H-indol-3-ylidene)-3,3a,9,9a-tetrahydroimidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-2,7(1H,6H)-diones has been developed.

Synthesis of New Imidazo[4,5-e][1,3]thiazolo-[3,2-b][1,2,4]triazine Derivatives

Previously unknown (Z)-6-aryl(hetaryl)methylidene derivatives of imidazo[4,5-e][1,3]thiazolo[3,2-b]-[1,2,4]triazine-2,7-diones were synthesized by aldol-crotonic condensation of imidazo[4,5-e]-[1,3]thiazolo[3,2-b][1,2,4]triazine-2,7-diones with aromatic or heteroaromatic aldehydes, or by three-component condensation of imidazo[4,5-e][1,2,4]triazine-3-thione, bromoacetic acid, and aldehyde.

Synthesis of imidazo[4,5-e][1,3]thiazolo-[3,2-b][1,2,4]triazines

Perhydroimidazo[4,5-e][1,2,4]triazine-3-thiones are alkylated with bromoacetic acid to give previously unreported imidazo[4,5-e][1,3]thiazolo[3,2-b][1,2,4]triazines whose structure has been confirmed by X-ray structural analysis.

Glycolurils in α-ureido-and α-aminoalkylation reactions 1. α-Ureidoalkylation of sulfamides with N-(hydroxymethyl)glycolurils

Abstractα-Ureidoalkylation of sulfamides with 2-hydroxymethyl-, 2,6-and 2,8-bis(hydroxymethyl)-, and 2,4,6,8-tetrakis(hydroxymethyl)glycolurils gave novel bi-, tri-, and tetracyclic fused systems combining the glycoluril and sulfamide fragments.