The condensation of 2-methylcyclohexanone (I) with 2-thienyllithium (II) or 2-thienylmagnesium bromide (III) gives cyclohexanol (IV) as a diastereomeric mixture, which was treated with sodium azide (NaN3) in trichloroacetic acid to yield the azide (V). The reduction of (V) with lithium aluminium hydride (LiAlH4) or Raney nickel in isopropanol affords the corresponding amine (VI), preferentially with the cis-configuration. Finally, this compound is condensed with 1,5-dibromopentane (VII) by means of potassium carbonate (K2CO3) in acetonitrile to provide the target compound as a diastereomeric mixture.
^US patent 6107495, Jean-Bernard Cazaux, Michel Dafniet, Jean-Marc Kamenka, Eric Manginot, "Thienylcyclohexane derivatives for thienylcyclohexyl synthesis"
^Jacques Hamon; Florence Espaze; Jacques Vignon; Jean-Marc Kamenka (1999). "The search for TCP analogues binding to the low affinity PCP receptor sites in the rat cerebellum". Eur. J. Med. Chem. 34 (2): 125–135. doi:10.1016/S0223-5234(99)80046-4.