This invention relates to benzodiazepine derivatives, compositions comprising therapeutically effective amounts of those benzodiazepine derivatives and methods of using those derivatives or compositions in treating cognitive impairment associated with central nervous system (CNS) disorders. In particular, it relates to the use of a α5- containing GABAA receptor agonist (e.g., a α5-containing GABAA receptor positive allosteric modulator) as described herein in treating cognitive impairment associated with central nervous system (CNS) disorders in a subject in need or at risk thereof, including, without limitation, subjects having or at risk for age-related cognitive impairment, Mild Cognitive Impairment (MCI), amnestic MCI (aMCI), Age -Associated Memory Impairment (AAMI), Age Related Cognitive Decline (ARCD), dementia, Alzheimer's Disease(AD), prodromal AD, post traumatic stress disorder (PTSD), schizophrenia, bipolar disorder, amyotrophic lateral sclerosis (ALS), cancer-therapy-related cognitive impairment, mental retardation, Parkinson's disease (PD), autism spectrum disorders, fragile X disorder, Rett syndrome, compulsive behavior, and substance addiction. It also relates to the use of a α5-containing GABAA receptor agonist (e.g., a α5-containing GABAA receptor positive allosteric modulator) as described herein in treating brain cancers (including brain tumors, e.g., medulloblastomas), and cognitive impairment associated therewith.L'invention concerne des dérivés de benzodiazépine, des compositions contenant des quantités thérapeutiquement efficaces desdits dérivés de benzodiazépine, et des méthodes d'utilisation des dérivés ou compositions dans le traitement de la déficience cognitive associée à des troubles du système nerveux central (CNS). L'invention concerne, en particulier, l'utilisation d'un agoniste du récepteur GABAA contenant a5 (par exemple, un modulateur allostérique positif du récepteur GABAA contenant a5) tel que décrit dans la description, dans le t
