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J Med Chem. 2006 Jul 13;49(14):4442-6.

Hydroxy-1,2,5-oxadiazolyl moiety as bioisoster of the carboxy function. Synthesis, ionization constants, and pharmacological characterization of gamma-aminobutyric acid (GABA) related compounds.

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  • 1Dipartimento di Scienza e Tecnologia del Farmaco, Universit√† degli Studi di Torino, Via Pietro Giuria 9, 10125 Torino, Italy.


Three 4-substituted 1,2,5-oxadiazol-3-ols containing aminoalkyl substituents (analogues and homologues of gamma-aminobutyric acid (GABA)) were synthesized to investigate the hydroxy-1,2,5-oxadiazolyl moiety as a bioisoster for a carboxyl group at GABA receptors. The pK(a) values of the target compounds were close to those of GABA. At GABA(A) receptors of cultured cerebral cortical neurons, weak agonist and partial agonist profiles were identified, demonstrating the 4-hydroxy-1,2,5-oxadiazol-3-yl unit to be a nonclassical carboxyl group bioisoster.

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