Results 31 to 40 of about 1,063 (182)

A Practical Approach to New (5Z) 2-Alkylthio-5-arylmethylene- 1-methyl-1,5-dihydro-4H-imidazol-4-one Derivatives [PDF]

, 2011
International audienceA practical protocol for the preparation of (5Z)-2-alkylthio-5-arylmethylene-1-methyl-1,5-dihydro-4H-imidazol-4-one derivatives is reported.
Bazureau, Jean-Pierre, Bourahla, Khadidja, Carreaux, François, Lozach, Olivier, Meijer, Laurent, Paquin, Ludovic   +5 more
core   +4 more sources

Convenient Synthesis of Thiohydantoins, Imidazole-2-thiones and Imidazo[2,1-b]thiazol-4-iums from Polymer-Supported α-Acylamino Ketones

Molecules, 2018
The preparation of 5-methylene-thiohydantoins using solid-phase synthesis is reported in this paper. After sulfonylation of immobilized Ser (t-Bu)-OH with 4-nitrobenzenesulfonyl chloride followed by alkylation with various bromoketones, the 4-Nos group ...
Petra Králová, Michal Maloň, Hiroyuki Koshino, Miroslav Soural   +3 more
doaj   +1 more source

Advances in Chemistry of Isothiocyanate-derived Colourants

Czech Journal of Food Sciences, 2009
This study is focused on the reactions of isothiocyanates (ITCs) in the presence of amino compounds leading to coloured structures via substituted 2-thiohydantoins.
K. Cejpek, J. Velíšek
doaj   +1 more source

Synthetical Application of Alkyl 2-isothiocyanatocarboxylates. A Simple Synthesis of 5-Substituted-3-amino-2-thioxo-4-imidazolidinones (3-Amino-2-thiohydantoins)

Molecules, 1999
The title 3-amino-2-thiohydantoins 3 has been prepared in very good yields by the reaction of alkyl isothiocynatocarboxylates 1 with hydrazine hydrate.The synthesis of starting isothiocyanates as well as spectral data of 3-aminothiohydantoins and alkyl ...
Martin Kovac, Vladimir Oremus, Lubomir Floch   +2 more
doaj   +1 more source

Synthesis and characterization of selected fused isoxazole and pyrazole derivatives and their antimicrobial activity [PDF]

, 2009
New potent antibacterials, fused isoxazole and pyrazole derivatives, were synthesized using 5,5-dimethylcyclohexane-1,3-dione (1) and 3-[(4-chlorobenzylidene)amino]-2-thioxoimidazolidin-4-one (2) as synthons. Aromatic aldehydes on condensation with 1 and
FAISAL Y. ANSARI, VIJAY V. DABHOLKAR
core   +1 more source

Ring closure reactions of bicyclic prolinol and prolin ester enantiomers [PDF]

, 2009
Starting from the of bicyclic proline ester, ethyl exo-2-azabicyclo[2.2.1]heptane-3-carboxylate (+)-5 several hydantoines and thiohydantoines were prepared by acidic ring closure of the corresponding urea or thiourea derivatives. Enantiomer (-)-5 was
Fülöp, Ferenc, Kivela, H., Molnar, Zs., Palkó, Márta, Pihlaja, K., Sinnkonen, J.   +5 more
core   +1 more source

An efficient synthesis of imidazo[2,1-b][1,3]thiazins via a one-pot, three-component and solvent-free reaction

Green Chemistry Letters and Reviews, 2016
A simple and eco-friendly method for the synthesis of novel imidazo[2,1-b][1,3]thiazin derivatives has been developed via the one-pot, three-component and solvent-free reaction of thiohydantoins, aromatic aldehyde and 5,5-dimethylcyclohexane-1,3-dione in
Mohammad Mehdi Ghanbari
doaj   +1 more source

Estrutura, reatividade e propriedades biológicas de hidantoínas Structure, reactivity, and biological properties of hidantoines

Química Nova, 2008
Hydantoin (imidazolidine-2,4-dione) is a 2,4-diketotetrahydroimidazole discovered by Baeyer in 1861. Thiohydantoins and derivatives were prepared, having chemical properties similar to the corresponding carbonyl compounds.
Silvânia Maria de Oliveira, João Bosco Paraíso da Silva, Marcelo Zaldini Hernandes, Maria do Carmo Alves de Lima, Suely Lins Galdino, Ivan da Rocha Pitta   +5 more
doaj   +1 more source

Reactivity of 2-Thiohydantoins Towards Various Electrophilic Reagents: Applications to the Synthesis of New 2-Ylidene-3,5-dihydro-4H-imidazol-4-ones.

Molecules, 2004
A new route to 5-(imidazolidin-2-ylidene)-2-methylsulfanyl-3,5-dihydro-imidazol-4-ones 4a-c using ketene dithioacetal intermediates 3a-c is described.
Jean Pierre Bazureau, François Carreaux, Jean-René Chérouvrier   +2 more
doaj   +1 more source

Solvent effects on the structure-property relationship of anticonvulsant hydantoin derivatives: A solvatochromic analysis [PDF]

, 2011
Considering the pharmaceutical importance of hydantoins, a set of 25 derivatives of phenytoin, nirvanol and 5-methyl-5-phenylhydantoin, the lipophilicities of which were gradually increased by the introduction of different alkyl, cycloalkyl and alkenyl ...
Gordana Ušćumlić, Nataša Valentić, Nemanja Trišović   +2 more
core   +1 more source