| abstract |
Compounds of formula (I) and salts thereof are useful for treating accumulation of calcium in brain cells, wherein X represents O, S, NH or a bond; p and q independently represent 0-4 such that the sum of p + q is at least 1; R?1 and R2¿ each independently represent hydrogen, C¿1-6?alkyl, C3-6cycloalkyl, or C1-4alkyl-C3-6cycloalkyl; n is 1, 2 or 3; and Ar represents phenyl optionally substituted by 1 to 3 substituents selected from: halo, C1-4alkyl, C1-4alkoxy, C1-2alkylenedioxy, trifluoromethyl, trifluoromethoxy, CN, NO2, amino, mono- or di-alkylamino, optionally substituted benzoyl and Ph(CH2)rY(CH2)s- where Ph is optionally substituted phenyl, Y is oxygen or a bond and r and s each independently represent 0-4 provided that the sum of r + s is not greater than 4, or Ar represents an optionally substituted unsaturated monocyclic heteroaryl ring system containing 5 or 6 ring members, or an optionally substituted, unsaturated or partially saturated bicyclic aryl or heteroaryl ring system containing 8-10 ring members. |