Abstract:
:We synthesized 5-allyl-1-methyl-5-(m-trifluoromethyl-diazirynylphenyl)barbituric acid (14), a trifluoromethyldiazirine-containing derivative of general anesthetic mephobarbital, separated the racemic mixture into enantiomers by chiral chromatography, and determined the configuration of the (+)-enantiomer as S by X-ray crystallography. Additionally, we obtained the (3)H-labeled ligand with high specific radioactivity. R-(-)-14 is an order of magnitude more potent than the most potent clinically used barbiturate, thiopental, and its general anesthetic EC(50) approaches those for propofol and etomidate, whereas S-(+)-14 is 10-fold less potent. Furthermore, at concentrations close to its anesthetic potency, R-(-)-14 both potentiated GABA-induced currents and increased the affinity for the agonist muscimol in human α1β2/3γ2L GABA(A) receptors. Finally, R-(-)-14 was found to be an exceptionally efficient photolabeling reagent, incorporating into both α1 and β3 subunits of human α1β3 GABA(A) receptors. These results indicate R-(-)-14 is a functional general anesthetic that is well-suited for identifying barbiturate binding sites on Cys-loop receptors.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Savechenkov PY,Zhang X,Chiara DC,Stewart DS,Ge R,Zhou X,Raines DE,Cohen JB,Forman SA,Miller KW,Bruzik KSdoi
10.1021/jm300631esubject
Has Abstractpub_date
2012-07-26 00:00:00pages
6554-65issue
14eissn
0022-2623issn
1520-4804journal_volume
55pub_type
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