Characterization of the Histamine H4 Receptor Binding Site. Part 1. Synthesis and Pharmacological Evaluation of Dibenzodiazepine Derivatives
摘要:
A series of dibenzodiazepine derivatives was synthesized to probe the binding site of the recently discovered histamine H-4 receptor (H4R). Optimization of the lead structure clozapine (2) resulted in (E)-7-chloro-11-(4-methylpiperazin-l-yl) dibenzo[b, f][1,4] oxazepine (7j), a potent H4R agonist (H4R, pK(i) = 7.6). Pharmacological data suggests that the series of nonimidazole compounds can be used to describe the orthosteric binding site of the H4R because both 2 and 7j displace [H-3] histamine in a competitive manner. Furthermore, it is demonstrated that the effects of 7j are competitively antagonized by the selective H4R antagonist JNJ 7777120 (1), indicating considerable overlap of their binding sites. On the basis of the derived structure-activity relationships and additional pharmacological results, a pharmacophore model was constructed, which will be the premise for the design of novel H4R ligands.
Characterization of the Histamine H4 Receptor Binding Site. Part 1. Synthesis and Pharmacological Evaluation of Dibenzodiazepine Derivatives
摘要:
A series of dibenzodiazepine derivatives was synthesized to probe the binding site of the recently discovered histamine H-4 receptor (H4R). Optimization of the lead structure clozapine (2) resulted in (E)-7-chloro-11-(4-methylpiperazin-l-yl) dibenzo[b, f][1,4] oxazepine (7j), a potent H4R agonist (H4R, pK(i) = 7.6). Pharmacological data suggests that the series of nonimidazole compounds can be used to describe the orthosteric binding site of the H4R because both 2 and 7j displace [H-3] histamine in a competitive manner. Furthermore, it is demonstrated that the effects of 7j are competitively antagonized by the selective H4R antagonist JNJ 7777120 (1), indicating considerable overlap of their binding sites. On the basis of the derived structure-activity relationships and additional pharmacological results, a pharmacophore model was constructed, which will be the premise for the design of novel H4R ligands.
A highly-efficient palladium-catalyzed aminocarbonylation/S<sub>N</sub>Ar approach to dibenzoxazepinones
作者:Chaoren Shen、Helfried Neumann、Xiao-Feng Wu
DOI:10.1039/c5gc00427f
日期:——
A practical protocol for the synthesis of dibenzo[b,e][1,4]oxazepin-11(5H)-ones has been developed. By virtue of Pd-catalyzed aminocarbonylation and aromatic nucleophilic substitution, 61 examples of the desired dibenzoxazepinones were obtained in moderate to excellent isolated yields (54-92%).
Characterization of the Histamine H<sub>4</sub> Receptor Binding Site. Part 1. Synthesis and Pharmacological Evaluation of Dibenzodiazepine Derivatives
作者:Rogier A. Smits、Herman D. Lim、Bart Stegink、Remko A. Bakker、Iwan J. P. de Esch、Rob Leurs
DOI:10.1021/jm051008s
日期:2006.7.1
A series of dibenzodiazepine derivatives was synthesized to probe the binding site of the recently discovered histamine H-4 receptor (H4R). Optimization of the lead structure clozapine (2) resulted in (E)-7-chloro-11-(4-methylpiperazin-l-yl) dibenzo[b, f][1,4] oxazepine (7j), a potent H4R agonist (H4R, pK(i) = 7.6). Pharmacological data suggests that the series of nonimidazole compounds can be used to describe the orthosteric binding site of the H4R because both 2 and 7j displace [H-3] histamine in a competitive manner. Furthermore, it is demonstrated that the effects of 7j are competitively antagonized by the selective H4R antagonist JNJ 7777120 (1), indicating considerable overlap of their binding sites. On the basis of the derived structure-activity relationships and additional pharmacological results, a pharmacophore model was constructed, which will be the premise for the design of novel H4R ligands.