The synthesis of 4-(2-aminoethy1)-5-methyl~ 3-isoxazolol zwitterion (16a) and 4-(2- aminopropyl)-5-methyl-3-isoxazolol zwitterion (16b) which are structural analogues of 5- aminomethyl~ 3-isoxazolol (Muscimol) and of y-aminobutyric acid (GABA) is described. The