2-[(3-Methoxyphenylethyl)phenoxy]-Based ABCB1 Inhibitors: Effect of Different Basic Side-Chains on Their Biological Properties

摘要

Recently, 2-[(3-methoxyphenylethyl)phenoxy]-moiety has been selected for the design and synthesis of new small ABCB1 inhibitors. In the present paper, this moiety has been linked through a spacer of 2-5 carbon atoms to the nitrogen of three different basic nuclei such as: (i) N-4-arylpiperazine, (ii) N-4-methylpiperazine, and (iii) 6,7-dimethoxytctrahydroisoquinoline. The results demonstrated that all the selected basic nuclei were well tolerated and that, globally, the best inhibitory activity for each series was obtained when the spacer between the 2-[(3-methoxyphenylethyl)phenoxy]moiety and the basic nucleus consisted of a four-carbon chain. Among the synthesized compounds, N-4-methylpiperazine- 10C (IC50 = 0.15 W) and tetrahydroisoquinoline-derivatives 11c (IC50 = 0.08 W) with the spacer n = 4 for both series, displayed the best potency to inhibit ABCB1 activity. Moreover, for each compound, the ABCB1 interacting mechanism has been evaluated by three combined biological assays. N-4-methylpiperazine- (10a-d) and tetrahydroisoquinoline-(11a-d) derivatives were Cyclosporin A-like ABCB1 nontransported substrates.