93390-81-9

Cerebyx was launched for the treatment of status epilepticus and for neurosurgery derived seizures. Fosphenytoin is rapidly converted by phosphatases to phenytoin. This compound is readily water soluble thus overcoming an important problem associated with Dilantin.

Warner-Lambert (USA)

Anticonvulsant.

ChEBI: Fosphenytoin is an imidazolidine-2,4-dione.

By action of formaldehyde and hydrochloric acid on 5,5-diphenylhydantoin was prepared 3-hydroxymethyl-5,5-diphenyl-imidazolidine-2,4-dione which was converted by action PCl3 to 3-chloromethyl-5,5-diphenyl-imidazolidine-2,4- dione by action PCl3. Then the chlorine atom was substituted on P(O)(OBz)Ogroup by action of argentum salt of phosphoric acid dibenzyl ester. Removal of the protecting groups by hydrogenolysis gives the 2,4-imidazolidinedione, 5,5- diphenyl-3-((phosphonooxy)methyl)- (fosphenytoin).
In practice it is usually used as sodium salt.

Cerebyx (Parke-Davis).

Antiepileptic, Anticonvulsant