Heterocyclic Spiro compounds Derivatives of - lactams, modulators of the NMDA Receptors, which includes Pharmaceutical composition useful for treating diseases, such as Attention Deficit Disorder, depression, anxiety, among others.COMPUESTOS HETEROCICLOS DERIVADOS DE 5-(3-HIDROXIBUTAN-2-IL)-2,5-DIAZASPIRO[3.4]OCTAN-1-ONA, MODULADORES DE LOS RECEPTORES NMDA; COMPOSICION FARMACEUTICA QUE LOS COMPRENDE; UTILES PARA TRATAR DEPRESION, ENFERMEDAD DE ALZHEIMER, TRASTORNO DE DEFICIT ATENCIONAL, ESQUIZOFRENIA O ANSIEDAD