Modified Akuamma Alkaloids with Increased Potency at the Mu-opioid Receptor.

Akuammine () and pseudoakuammigine () are indole alkaloids found in the seeds of the akuamma tree (). Both alkaloids are weak agonists of the mu opioid receptor (μOR); however, they produce minimal effects in animal models of antinociception. To probe the interactions of and at the opioid receptors, we have prepared a collection of 22 semisynthetic derivatives. Evaluation of this collection at the μOR and kappa opioid receptor (κOR) revealed structural-activity relationship trends and derivatives with improved potency at the μOR. Most notably, the introduction of a phenethyl moiety to the N1 of produces a 70-fold increase in potency and a 7-fold increase in selectivity for the μOR. The potency of this compound resulted in increased efficacy in the tail-flick and hot-plate assays of antinociception. The improved potency of these derivatives highlights the promise of exploring natural product scaffolds to probe the opioid receptors.