Synthesis and Resolution of <i>cis</i>-(±)-Methyl (1<i>R</i>,2<i>S</i>/1<i>S</i>,2<i>R</i>)-2-[(4-Hydroxy-4-phenylpiperidin-1-yl)methyl]-1-(4-methylphenyl)cyclopropanecarboxylate [(±)-PPCC)]: New σ Receptor Ligands with Neuroprotective Effect
The enantiomers of cis-(±)-methyl (1R,2S/1S,2R)-2-[(4-hydroxy-4-phenylpiperidin-1-yl)methyl]-1-(4-methylphenyl)cyclopropanecarboxylate [1, (±)-PPCC], a selective σ ligand, were synthesized. The (+)- and (−)-enantiomers bind predominantly to σ1 receptors and have a reduced σ2 affinity. Both individually restore the astroglial oxidative status modified by glutamate, counteracting also transglutaminase-2