This invention relates to pyridazine derivatives, compositions comprising therapeutically effective amounts of those pyridazine derivatives and methods of using those derivatives or compositions in treating central nervous system (CNS) disorders with cognitive impairment that are responsive to agonists of α5 subunit containing GABAA receptor, e.g., age-related cognitive impairment, Mild Cognitive Impairment (MCI), dementia, Alzheimers Disease (AD), prodromal AD, post traumatic stress disorder (PTSD), schizophrenia and cancer-therapy-related cognitive impairment.
