The title compound, 3-amino-5-methyl-5-(4-pyrid-yl)imid-azol-idine-2,4-dione, C(9)H(10)N(4)O(2), was obtained by reaction of 5-methyl-5-(4-pyrid-yl)hydantoin with hydrazine. It crystallizes as a racemate in the tetra-gonal space group I4(1)/a with one mol-ecule in the asymmetric unit. The dihedral angle between the pyridine ring and the five-membered hydantoin ring is 47.99 (3)° In the crystal ...

In the asymmetric unit of the title organic-inorganic hybrid material, 2{H(3)[PW(12)O(40)]}·4C(3)H(4)N(2)O(2)·C(7)H(8)N(4)O(4)·21.5H(2)O, there are four crystallographically independent hydantoin mol-ecules, one dimerized hydantoin mol-ecule, viz. 1,1'-methyl-enebis(imidazolidine-2,4-dione, two independent H(3)PW(12)O(40) mol-ecules and 21.5 solvent water mol-ecules. Nine of the solvent water m...

Fluorous diastereomeric mixture synthesis (FDMS) is introduced and demonstrated in the synthesis of six diastereomers of hydantoin-fused hexahydrochromeno[4,3-b]pyrroles.

A number of structurally related hydantoins has been examined for their effects on the metabolic activities of Ehrlieh aseites carcinoma cells. 5-Ethylsulfinylmethylhydantoin [ESH] was a potent inhibitor of such activities. 5-Ethylsulfonylmethylhydantoin had less activity, and the other hydantoins tested were without effect. ESH was also a potent inhibitor of metabolism in Salk "altered" monkey...

A number of structurally related hydantoins has been examined for their effects on the metabolic activities of Ehrlieh aseites carcinoma cells. 5-Ethylsulfinylmethylhydantoin [ESH] was a potent inhibitor of such activities. 5-Ethylsulfonylmethylhydantoin had less activity, and the other hydantoins tested were without effect. ESH was also a potent inhibitor of metabolism in Salk "altered" monkey...

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 groups in position N3, was synthesized. Their properties under consideration were either estimated empirically, by UV/Vis spectroscopy, or calcu...

A number of structurally related hydantoins has been examined for their effects on the metabolic activities of Ehrlieh aseites carcinoma cells. 5-Ethylsulfinylmethylhydantoin [ESH] was a potent inhibitor of such activities. 5-Ethylsulfonylmethylhydantoin had less activity, and the other hydantoins tested were without effect. ESH was also a potent inhibitor of metabolism in Salk "altered" monkey...