Design, Synthesis, and Biological Evaluation of New 1,8-Naphthyridin-4(1<i>H</i>)-on-3-carboxamide and Quinolin-4(1<i>H</i>)-on-3-carboxamide Derivatives as CB<sub>2</sub> Selective Agonists
作者:Clementina Manera、Veronica Benetti、M. Paola Castelli、Tiziana Cavallini、Sara Lazzarotti、Fabio Pibiri、Giuseppe Saccomanni、Tiziano Tuccinardi、Alfredo Vannacci、Adriano Martinelli、Pier Luigi Ferrarini
DOI:10.1021/jm0603466
日期:2006.10.1
On the basis of docking studies carried out using the recently published cannabinoid receptor models,(35) new 1,8-naphthyridin-4(1H)-on-3-carboxamide and quinolin-4(1H)-on-3-carboxamide derivatives were designed, synthesized, and tested for their affinities toward the cannabinoid CB1 and CB2 receptors. Compound 10, which presented p-fluorobenzyl and carboxycycloheptylamide substituents bound in the 1 and 3 positions of the 1,8-naphthyiridine-4-one nucleus, showed a high CB2 affinity with a K-i of 1.0 nM. The substitution of the naphthyridine-4-one nucleus with the quinoline-4-one system determined a general increase in CB2 affinity. In particular, the N-cyclohexyl-7-chloro-1-(2-morpholin-4-ylethyl) quinolin-4(1H)-on-3-carboxamide (40) possessed a remarkable affinity, with K-i of 3.3 nM, which was also accompanied by a high selectivity for the CB2 receptor (K-i(CB1)/K-i(CB2) ratio greater than 303). Moreover, the [S-35]GTP gamma binding assay and functional studies on human basophils indicated that the 1,8-naphthyridin-4(1H)-on-3-carboxamide derivatives behaved as CB1 and CB2 receptor agonists.