A new class of quinoline compounds is useful for the detection and treatment of Alzheimers disease and other neurodegenerative diseases such as amyloidoses and tauopathies. The compounds can be synthesized in radiolabeled form for use as imaging agents, which can be used for early detection of aggregates in the brain or other tissues prior to onset of symptoms, allowing early therapeutic intervention. The compounds are also useful for the prevention and treatment of such diseases.