Recent studies have suggested that the α7 nicotinic acetylcholine receptors play important roles in learning and memory. Herein, we describe our research of the structure-activity relationships (SAR) in a series of (S)-spiro [1-azabicyclo [2.2. 2] octane-3, 5'-oxazolidin]-2'- ones bearing various bicyclic moieties to discover novel α7 receptor agonists. Through a number of SAR studies on the series, we have found out that inhibition of CYP 2D6 ...