The cholinergic hypothesis',* is a major neurochemical base for current Alzheimer's research. This has resulted in a renewed interest in the muscarinic receptor (s) field. As an extension of our study on the structure-activity relationship of muscarinic ligand^,^-^ we prepared the acetate and 2, 2-diphenylpropionate esters of endo-and exo-2-alkyl-2- azabicyclo [2.2. l] heptan-5-01 (1 and 2) and not significantly different and to approximate ...