Design, Synthesis, and Biological Evaluation of New 1,8-Naphthyridin-4(1H)-on-3-carboxamide and Quinolin-4(1H)-on-3-carboxamide Derivatives as CB2 Selective Agonists
摘要:
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.
New 1,8-naphthyridine and quinoline derivatives as CB2 selective agonists
作者:Clementina Manera、Maria Grazia Cascio、Veronica Benetti、Marco Allarà、Tiziano Tuccinardi、Adriano Martinelli、Giuseppe Saccomanni、Elisa Vivoli、Carla Ghelardini、Vincenzo Di Marzo、Pier Luigi Ferrarini
DOI:10.1016/j.bmcl.2007.09.089
日期:2007.12
A series of new 1,8-naphthyridine and quinoline derivatives were synthesized and evaluated for their cannabinoid receptor affinity. In particular, compounds 2, 5, 11, and 13 showed a high CB2 affinity and CB2 versus CB1 selectivity, in agreement with molecular modeling studies. Furthermore, compound 2 also exhibited in vivo antinociceptive effects. (c) 2007 Elsevier Ltd. All rights reserved.