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.
Dibenzo[ b , f ][1,4]oxazepines and dibenzo[ b , e ]oxepines: Influence of the chlorine substitution pattern on the pharmacology at the H 1 R, H 4 R, 5-HT 2A R and other selected GPCRs
lpiperazin-1-yl)dibenzo[b,f][1,4]oxazepine), reported as a dual H1/H4 receptor ligand (pKi: 8.11 (human H1R (hH1R)), 7.55 (human H4R (hH4R))), four known and 28 new oxazepine and related oxepine derivatives were synthesised and pharmacologically characterized at histamine receptors and selected aminergic GPCRs. In contrast to the oxazepineseries, within the oxepine series, the new compounds showed
Tricyclic dihydrobenzoxazepine and tetracyclic indole derivatives can specifically target bacterial DNA ligases and can distinguish them from human DNA ligase I
DNA ligases are critical components for DNA metabolism in all organisms.
DNA连接酶是所有生物体中DNA代谢的关键组成部分。
One-pot synthesis of substituted dibenzoxazepinones and pyridobenzoxazepinones using octacarbonyldicobalt as an effective CO source
作者:Kavitha Anchan、Poongavanam Baburajan、Nagaswarupa H. Puttappa、Sujit Kumar Sarkar
DOI:10.1080/00397911.2019.1695277
日期:2020.2.1
Abstract A facile one-pot protocol for the synthesis of substituted dibenzoxazepinones and pyridobenzoxazepinones from commercially available aryl/heteroaryl halides and amino phenols using octacarbonyldicobalt (Co2(CO)8) as an effective metal carbonyl source has been demonstrated. This method proceeds via the sequential coupling of aryl/heteroaryl halides with aminophenol by amidation and intramolecular
A new approach to the synthesis of 10‐ and 11‐membered lactams via hydrated imidazoline ringexpansion is described. In addition to the ringexpansion an alternative course of the hydrated imidazoline evolution was discovered, for the first time, which gave N‐aminoethyl derivatives.
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%).