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An efficient and highly stereocontrolled approach for the synthesis of the quinuclidine incorporated lobelane analogues, endo,endo- and exo,exo-2,6-cis-diphenethyl-1-azabicyclo-[2.2.2]octane (2 and 3), has been developed. Analogues 2 and 3 were designed to mimic the axial and equatorial geometry, respectively, of the vesicular monoamine transporter-2 (VMAT2) inhibitor, lobelane. The exo,exo analogue 2 had comparable affinity to lobelane and had greater affinity than the endo,endo analogue 3 at the tetrabenazine binding site on VMAT2, indicating that the preferred binding mode of lobelane is likely the extended conformation.

Stereocontrolled Synthesis and Pharmacological Evaluation ofcis-2,6-Diphenethyl-1-azabicyclo[2.2.2]octanes as Lobelane Analogues