7-Alkyl-3-benzylcoumarins: A Versatile Scaffold for the Development of Potent and Selective Cannabinoid Receptor Agonists and Antagonists
作者:Viktor Rempel、Nicole Volz、Sonja Hinz、Tadeusz Karcz、Irene Meliciani、Martin Nieger、Wolfgang Wenzel、Stefan Bräse、Christa E. Müller
DOI:10.1021/jm3008213
日期:2012.9.27
A series of 7-alkyl-3-benzylcoumarins was designed, synthesized, and tested at cannabinoid CB1 and CB2 receptors in radioligand binding and cAMP accumulation studies. 7-Alkyl-3-benzylcoumarins were found to constitute a versatile scaffold for obtaining potent CB receptor ligands with high potency at either CB1 or CB2 and a broad spectrum of efficacies. Fine-tuning of compound properties was achieved by small modifications of the substitution pattern. The most potent compounds of the present series include 5-methoxy-3-(2-methylbenzyl)-7-pentyl-2H-chromen-2-one (19a, PSB-SB-1201), a selective CB1 antagonist (K-i CB1 0.022 mu M), 5-methoxy-3-(2-methoxybenzyl)-7-pentyl-2H-chromen-2-one (21a, PSB-SB-1202), a dual CB1/CB2 agonist (CB1 K-i 0.032 mu M, EC50 0.056 mu M; CB2 K-i 0.049 mu M, EC50 0.014 mu M), 5-hydroxy-3-(2-hydroxybenzyl)-7-(2-methyloct-2-yl)-2H-chromen-2-one (25b, PSB-SB-1203), a dual CB1/CB2 ligand that blocks CB1 but activates CB2 receptors (CB1 K-i 0.244 mu M; CB2 K-i 0.210 mu M, EC50 0.054 mu M), and 7-(1-butylcyclopentyl)-5-hydroxy-3-(2-hydroxybenzyl)-2H-chromen-2-one (27b, PSB-SB-1204), a selective CB2 receptor agonist (CB1 K-i 1.59 mu M; CB2 K-i 0.068 mu M, EC50 0.048 mu M).