Hydantoin
Hydantoin, or glycolylurea, is a heterocyclic organic compound with the formula CH2C(O)NHC(O)NH. It is a colorless solid that arises from the reaction of glycolic acid and urea. It is an oxidized derivative of imidazolidine. In a more general sense, hydantoins can refer to groups or a class of compounds with the same ring structure as the parent compound. For example, phenytoin (mentioned below) has two phenyl groups substituted onto the number 5 carbon in a hydantoin molecule.<ref name= Konnert>Template:Cite journal</ref>
SynthesisEdit
Hydantoin was first isolated in 1861 by Adolf von Baeyer in the course of his study of uric acid. He obtained it by hydrogenation of allantoin, hence the name.
Friedrich Urech synthesized 5-methylhydantoin in 1873 from alanine sulfate and potassium cyanate in what is now known as the Urech hydantoin synthesis.<ref>Template:Cite journal</ref> The method is very similar to the modern route using alkyl and arylcyanates. The 5,5-dimethyl compound can also be obtained from acetone cyanohydrin (also discovered by Urech: see cyanohydrin reaction) and ammonium carbonate.<ref>Template:OrgSynth</ref> This reaction type is called the Bucherer–Bergs reaction.<ref>Template:Cite journal</ref><ref>Bergs, Ger. pat. 566,094 (1929) [C. A., 27, 1001 (1933)].</ref>
Hydantoin can also be synthesized either by heating allantoin with hydroiodic acid or by "heating bromacetyl urea with alcoholic ammonia".<ref>Template:Cite EB1911</ref> The cyclic structure of hydantoins was confirmed by Dorothy Hahn 1913.<ref>Template:Cite encyclopedia</ref>
Of practical importance, hydantoins are obtained by condensation of a cyanohydrin with ammonium carbonate. Another useful route, which follows the work of Urech, involves the condensation of ⍺-amino acids or ⍺-amino esters with cyanates and isocyanates:<ref>Template:Cite journal</ref>
Uses and occurrenceEdit
PharmaceuticalsEdit
The hydantoin group can be found in several medicinally important compounds.<ref name= Konnert/> In pharmaceuticals, hydantoin derivatives form a class of anticonvulsants;<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> phenytoin and fosphenytoin both contain hydantoin moieties and are both used as anticonvulsants in the treatment of seizure disorders. The hydantoin derivative dantrolene is used as a muscle relaxant to treat malignant hyperthermia, neuroleptic malignant syndrome, spasticity, and ecstasy intoxication. Ropitoin is an example of an antiarrhythmic hydantoin.
PesticidesEdit
The hydantoin derivative Imiprothrin is a pyrethroid insecticide. Iprodione is a popular fungicide containing the hydantoin group.<ref name = Ullmann>Template:Cite encyclopedia</ref>
Synthesis of amino acidsEdit
Hydrolysis of hydantoins affords amino acids:
Hydantoin itself reacts with hot, dilute hydrochloric acid to give glycine. Methionine is produced industrially via the hydantoin obtained from methional.<ref name = Ullmann/>
MethylationEdit
Methylation of hydantoin yields a variety of derivatives. Dimethylhydantoin (DMH) <ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> may refer to any dimethyl derivative of hydantoin, but especially 5,5-dimethylhydantoin.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
HalogenationEdit
Some N-halogenated derivatives of hydantoin are used as chlorinating or brominating agents in disinfectant/sanitizer or biocide products. The three major N-halogenated derivatives are dichlorodimethylhydantoin (DCDMH), bromochlorodimethylhydantoin (BCDMH), and dibromodimethylhydantoin (DBDMH). A mixed ethyl-methyl analogue, 1,3-dichloro-5-ethyl-5-methylimidazolidine-2,4-dione (bromochloroethylmethylhydantoin), is also used in mixtures with the above.
DNA oxidation to hydantoins after cell deathEdit
A high proportion of cytosine and thymine bases in DNA are oxidized to hydantoins over time after the death of an organism. Such modifications block DNA polymerases and thus prevents PCR from working. Such damage is a problem when dealing with ancient DNA samples.<ref>Template:Cite journal</ref>
External links and further readingEdit
- Template:Cite journal
- [1] Template:Webarchive English Translation of 1926 German review article on the Preparation of hydantoins by Heinrich Biltz and Karl Slotta