Abstract
A novel opioid ligand possessing a stable and cyclic imine 16 and its derivatives with an azabicyclo[2.2.2]octane skeleton were synthesized. The imine 16 showed higher affinity for the μ receptor than compound 21 with an oxabicyclo[2.2.2]octane skeleton. Azabicyclo[2.2.2]octane derivative 18d with a cyclopropylmethyl group on the 8-nitrogen showed the highest affinity for the μ receptor among the synthesized derivatives.
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