Cerebrovasodilatation through selective inhibition of the enzyme carbonic anhydrase. 2. Imidazo[2,1-b]thiadiazole and imidazo[2,1-b]thiazolesulfonamides
摘要:
A series of imidazo[2,1-b]thiadiazole and imidazo[2,1-b]thiazolesulfonamide carbonic anhydrase inhibitors is described and their anticonvulsant activities are listed. Many of the compounds have the same degree of ionization as acetazolamide and methazolamide, but their higher lipophilicity means that they are more able to penetrate into the central nervous system. One compound, 6-tert-butyl-2-sulfamoylimidazo[2,1-b]-1,3,4-thiadiazole (8, UK-15,454) had an anticonvulsant ED50 of 2.6 mg/kg when administered orally to mice. 8 selectively increased cerebral blood flow in animals without producing a high level of metabolic acidosis.
The present invention relates to pyrrazolo-pyrimidine derivatives of formula (I):
wherein R
1
to R
4
and A are as defined in the specification, a process for the manufacture thereof, their use for treating or preventing metabotropic glutamate receptors mediated disorders, their use for the preparation of medicaments for treating such disorders and pharmaceutical compositions containing said derivatives.
Cerebrovasodilatation through selective inhibition of the enzyme carbonic anhydrase. 2. Imidazo[2,1-b]thiadiazole and imidazo[2,1-b]thiazolesulfonamides
作者:Ian T. Barnish、Peter E. Cross、Roger P. Dickinson、Brian Gadsby、Michael J. Parry、Michael J. Randall、Ian W. Sinclair
DOI:10.1021/jm00176a003
日期:1980.2
A series of imidazo[2,1-b]thiadiazole and imidazo[2,1-b]thiazolesulfonamide carbonic anhydrase inhibitors is described and their anticonvulsant activities are listed. Many of the compounds have the same degree of ionization as acetazolamide and methazolamide, but their higher lipophilicity means that they are more able to penetrate into the central nervous system. One compound, 6-tert-butyl-2-sulfamoylimidazo[2,1-b]-1,3,4-thiadiazole (8, UK-15,454) had an anticonvulsant ED50 of 2.6 mg/kg when administered orally to mice. 8 selectively increased cerebral blood flow in animals without producing a high level of metabolic acidosis.
Backer; Buisman, Recueil des Travaux Chimiques des Pays-Bas, 1944, vol. 63, p. 228