Novel 3-Trifluoromethyl-1,2,4-oxadiazole Analogues of Astemizole with Multi-stage Antiplasmodium Activity and In Vivo Efficacy in a Plasmodium berghei Mouse Malaria Infection Model
4-(2-Pyridyl)piperazine-1-benzimidazoles as potent TRPV1 antagonists
摘要:
A series of 4-(2-pyridyl)piperazine-1-benzimidazole analogues based on compound I was synthesized and evaluated for TRPV1 antagonist activity in capsaicin-induced (CAP) and pH5.5-induced (pH) FLIPR assays in a human TRPV1 -expressing HEK293 cell line. Potent TRPV1 antagonists were identified through SAR studies. From these studies, several antagonists were found, with IC50 values ranging from 32nM to similar to5000nM. Among these, 11 [IC50 = 90nM (CAP) and 104nM (pH)] was further evaluated and found to be orally available in rats (F% = 19.7). (C) 2004 Elsevier Ltd. All rights reserved.
Herein, a base‐controlled protocol was developed for the C−N coupling of primary amines and 2‐chlorobenzimidazoles, affording a handful of secondary or tertiary amines in a selective fashion. Moreover, this protocol was realized under transition‐metal‐free conditions, and the variation of the base from iPr2NH to LiOtBu completely switched the selectivity from monoarylation to diarylation. Further investigations
本文中,开发了一种碱控制的方案,用于伯胺和2-氯苯并咪唑的C-N偶联,以选择性方式提供了少量仲胺或叔胺。此外,该方案是在无过渡金属条件下实现的,碱从i Pr 2 NH到LiO t Bu的变化完全将选择性从单芳基化转变为二芳基化。进一步的研究表明,所用碱的种类,内在的碱性和数量极大地影响了这些反应。
Palladium‐Catalyzed Ligand‐Free C‐N Coupling Reactions: Selective Diheteroarylation of Amines with 2‐Halobenzimidazoles
examples were reported for the di-substituted products and the selectivity of mono- vs. di-substitution was relatively low. Considering the potential values of the di-substituted products, we accomplished the first selective diheteroarylation of amines with 2-halobenzimidazoles. Notably, this Pd-catalyzed transformation was realized under ligand-free conditions. Accordingly, numerous target products