Some pyrrolidines and azacycloheptanes related to reversed esters of pethidine

The preparation of some N‐substituted 3‐phenylpyrrolidin‐3‐ols and their derivatives is described, and the hot‐plate analgesia activities in mice of these compounds and related azacycloheptane derivatives reported. The effect of changes in ring size upon the analgesic activities of 4‐phenylpiperidine derivatives is discussed.