The in vitro anti-cholinesterase activity of designed compounds 7a-r was evaluated against AChE and BuChE, in comparison with tacrine as reference drug. The IC50 values of compounds are listed in Table 1. The obtained IC50 values against AChE demonstrated that most compounds had potent inhibitory activity. Among them, the piperidinylethoxy derivatives 7d, 7f, 7j and 7p with IC50 values of 0.122–0.207 μM were more potent than standard drug tacrine against AChE.