Abstract
A series of 1-aryl-1,2,3,4-tetrahydroisoquinoline and 8-methyl-1-aryl-1,2,3,4-tetrahydroisoquinoline derivatives was evaluated for affinity to the PCP binding site of the NMDA receptor complex. The ( S)-configurated tetrahydroisoquinoline derivative ( S)- 4e·HCl bearing a 2-methylphenyl substituent in position 1 of the heterocyclic ring system and a methyl group in position 8 was found to exhibit the highest affinity among the derivatives with a K i-value of 0.0374 μM. In addition, this compound shows a remarkable enantioselectivity of binding by being almost 90 times more potent than the corresponding ( R)-enantiomer ( R)- 4e·HCl. Additionally, a convenient and efficient synthetic approach to racemic 1-aryl-1,2,3,4-tetrahydroisoquinoline derivatives is described.
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