Title:Synthesis of Adamantane Aminoethers with Antitubercular Potential
Volume: 13
Issue: 7
Author(s): Angeliki-Sofia Foscolos, Ioannis Papanastasiou*, Andrew Tsotinis, Nicolas Kolocouris, George B. Foscolos, Anthony Vocat and Stewart T. Cole
Affiliation:
- Department of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupoli- Zografou, 157 84 Athens,Greece
Keywords:
(Adamantane-2, 2-diyl) substitution, (adamantane-1, 3-diyl) substitution, aminoethers, antitubercular activity,
Tuberculosis (TB), antitubercular chemotherapy.
Abstract: Background: Intrigued by the fact that aminoadamantane derivatives, bearing the active
1,2-ethylenediamine moiety, are promising antitubercular agents, we report herein the synthesis and
the antitubercular evaluation of N,N'-substituded-4,4'-[adamantane-2,2-diyl]bis(phe-noxyalkylamines)
1a-g, N,N'-substituded-4,4'-[adamantane-1,3-diyl]bis(phenoxyalkylamines) 2a-f, N,N'-
substituded-[4-(1-adamantyl)phenoxy]alkylamines 3a-d and N,N'-substituded-[4-(2-adamantyl)-
phenoxy]alkylamines 4a,b.
Method: A substituted diarylmethane moiety was introduced on the adamantane skeleton of the
new derivatives. The synthesis of the above compounds involved the nucleophilic attack of the
corresponding phenoxide, to the appropriate aminoalkylchloride hydrochloride under heating.
Results: The double substituted adamantane derivatives with an aminoether side chain exhibit significant
activity against Mycobacterium tuberculosis.
Conclusion: The length and the nature of the amino end of the side chain influence the antitubercular
activity. The double phenolic substitution of the adamantane scaffold and the aminoether side
chain with a three-methylene spacer between the phenoxy group and the nitrogen atom present the
better results. (analogues 1f,g and 2e,f). These findings merit further investigation aiming at the
design of more potent adamantane antituberculars, bearing a number of different substituents on
the diarylmethane pharmacophore, which will also be translocated to other posititions on the adamantane
ring.
