Synthesis and Acetylcholinesterase/Butyrylcholinesterase Inhibition Activity of 4‐Amino‐2, 3‐diaryl‐5, 6, 7, 8‐tetrahydrofuro(and thieno)[2, 3‐b]‐quinolines, and 4‐Amino‐5, 6, 7, 8, 9‐pentahydro‐2, 3‐diphenylcyclohepta[e]furo(and thieno)‐[2, 3‐b]pyridines