This study describes the synthesis and the structure-activity relationships (SARs) of the (S)-(- )-enantiomers of a novel class of 24 aminomethy1) piperidine derivatives, using K-opioid binding anity and antinociceptive potency as the indices of biological activity. Compounds incorporating the 1-tetralon-6-ylacetyl residue (30 and 34-45) demonstrated an in vivo antinociceptive activity greater than predicted on the basis of their K-binding affinities. In ...