Stereoselective synthesis and pharmacological evaluation of [4.3.3]propellan-8-amines as analogs of adamantanamines.

Héctor Torres-Gómez, Kirstin Lehmkuhl, Bastian Frehland, Constantin Daniliuc, Dirk Schepmann, Christina Ehrhardt, Bernhard Wünsch

Index: Bioorg. Med. Chem. 23 , 4277-85, (2015)

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Abstract

Amantadine (1) exerts its anti-Parkinson effects by inhibition of the NMDA associated cation channel and its antiviral activity by inhibition of the M2 protein channel of influenza A viruses. Herein the synthesis, NMDA receptor affinity and anti-influenza activity of analogous propellanamines 3 are reported. The key steps in the synthesis of the diastereomeric propellanamines syn-3 and anti-3 are diastereoselective reduction of the ketone 7 with L-Selectride to give anti-11, Mitsunobu inversion of the alcohol anti-13 into syn-13, and SN2 substitution of diastereomeric mesylates syn-14 and anti-14 with NaN3. The affinity of the propellanamines syn-3 and anti-3 to the PCP binding site of the NMDA receptor is similar to that of amantadine (Ki=11 μM). However, both propellanamines syn-3 and anti-3 do not exhibit activity against influenza A viruses. Compared to amantadine (1), the structurally related propellanamines syn-3 and anti-3 retain the NMDA antagonistic activity but loose the antiviral activity.Copyright © 2015 Elsevier Ltd. All rights reserved.