The present invention refers to novel methods for obtaining novel derivatives: (+) 3-hidroxy-3-phenyl pentanamide and (-)3-hidroxy-3-phenyl pentanamide, which have anti-convulsive activity, of general formula: (see formula).La presente invención se refiere a nuevos métodos para obtener derivados: (+) 3-hidroxi-3-fenilpentanamida y (-) 3-hidroxi-3-fenilpentanamida, los cuales presentan actividad anticonvulsionante, de fórmula general: (ver Fórmula).