1H NMR spectroscopy was used to monitor the reactions of an arylidene 2-thiohydantoin derivative, 3-((phenylmethylene)amino)-2-thioxo-4- imidazolidinone (3), with PdCl2, cis-[PdCl2(dmso-S)2] and K2[PdCl4] in DMSO-d6 order elucidate reaction kinetics mechanism. The derivative 3 formed cis-[Pd(3-N,S)(dmso-S)2]+ complex (5) PdCl2 cis-[PdCl2(dmso-S)2], while no observed. A two-step mechanism for ci...

In this work we present the synthesis and X-ray single crystal structural characterizat ion of the heterocyclic compound rac-N-acetyl-2-thiohydantoin-leucine. Th is material crystallize in the triclin ic system with space group P-1 (No2), Z=4, with two independent molecu les in the unit asymmetric. The crystal packing is governed by N--H···O hydrogen bond-type intermolecular interactions, formi...

[reaction: see text] A new access to benzhydryl-phenylureas is described. These new interesting urea derivatives were obtained by reaction of substituted benzils with substituted phenylureas under microwave irradiation. Phenylthiourea, when reacted with benzil, gave 3-phenyl-thiohydantoin. Moreover, benzylurea, as phenethylurea, gave the corresponding 3-substituted hydantoin derivatives, demons...

To obtain a rapid, efficient and mild synthesis of 5,5-diphenylhydantoin and 5,5-diphenyl-2-thiohydantoin derivatives, ultrasonic irradiation has been applied to the reaction mixtures containing substituted benzils and urea or thiourea derivatives catalyzed by KOH in DMSO/H(2)O, which allowed us to achieve products at room temperature in a good yield and short time without any side product. Thi...

The sequential sulfonylation/desulfination reactions of 5-benzylthiohydantoin with excess arylsulfonyl chlorides in the presence of triethylamine have been developed to afford a wide range of 5-arylidene thiohydantoin derivatives in moderate to excellent yields. A plausible sulfonylation/desulfination mechanism was proposed. The bioassay showed that these compounds exhibit certain fungicidal ac...