4,5-Diphenyltriazol-3-ones: Openers of Large-Conductance Ca2+-Activated Potassium (Maxi-K) Channels
摘要:
A series of diphenyl-substituted heterocycles were synthesized and evaluated by electrophysiological techniques as openers of the cloned mammalian large-conductance, Call-activated potassium (maxi-K) channel. The series was designed from deannulation of known benzimidazolone maxi-K opener NS-004 (2) thereby providing an effective template for obtaining structure-activity-related information. The triazolone ring system was the most studied wherein 4,5-diphenyltriazol-3-one 6d (maxi-K = 158%) was identified as the optimal maxi-K channel opener.
A mild and efficient method for aromatic chlorination of electron-rich arylalkyl amines
作者:Guixue Yu、Helen J Mason、Ximao Wu、Masaki Endo、James Douglas、John E Macor
DOI:10.1016/s0040-4039(01)00430-0
日期:2001.5
Sulfuryl chloride was used to chlorinate electron-rich arylalkyl amines in a mild and efficient one-pot transformation with simple product isolation via precipitation. Protection of the amine was not needed.
The invention relates to a compound of formula (I) having use for in vivo imaging of the NR2B subtype of the NMDA receptor.
本发明涉及一种化合物,其化学式为(I),用于体内成像NMDA受体的NR2B亚型。
Modulation of adenosine receptor affinity and intrinsic efficacy in adenine nucleosides substituted at the 2-position
作者:Michihiro Ohno、Zhan-Guo Gao、Philippe Van Rompaey、Susanna Tchilibon、Soo-Kyung Kim、Brian A Harris、Ariel S Gross、Heng T Duong、Serge Van Calenbergh、Kenneth A Jacobson
DOI:10.1016/j.bmc.2004.03.031
日期:2004.6
We studied the structural determinants of binding affinity and efficacy of adenosine receptor (AR) agonists. Substituents at the 2-position of adenosine were combined with N-6-substitutions known to enhance human A(3)AR affinity. Selectivity of binding of the analogues and their functional effects on cAMP production were studied using recombinant human A(1), A(2A), A(2B), and A(3)ARs. Mainly sterically small substituents at the 2-position modulated both the affinity and intrinsic efficacy at all subtypes. The 2-cyano group decreased hA(3)AR affinity and efficacy in the cases of N-6-(3-iodobenzyl) and N-6-(trans-2-phenyl-1-cyclopropyl), for which a full AAR agonist was converted into a selective antagonist; the 2-cyano-N-6-methyl analogue was a full A(3)AR agonist. The combination of N-6-benzyl and various 2-substitutions (chloro, trifluoromethyl, and cyano) resulted in reduced efficacy at the A(1)AR. The environment surrounding the 2-position within the putative A(3)AR binding site was explored using rhodopsin-based homology modeling and ligand docking. (C) 2004 Elsevier Ltd. All rights reserved.
Exploring human adenosine A3 receptor complementarity and activity for adenosine analogues modified in the ribose and purine moiety
作者:Philippe Van Rompaey、Kenneth A. Jacobson、Ariel S. Gross、Zhan-Guo Gao、Serge Van Calenbergh
DOI:10.1016/j.bmc.2004.11.044
日期:2005.2
In this paper we investigated the influence on affinity, selectivity and intrinsic activity upon modification of the adenosine agonist scaffold at the 3- and 5'-positions of the ribofuranosyl moiety and the 2- and N-6-positions of the purine base. This resulted in the synthesis of various analogues, that is, 3-12 and 24-33, with good hA(3)AR selectivity and moderate-to-high affinities (as in 32, K-i = 27 nM). Interesting was the ability to tune the intrinsic activity depending on the substituent introduced at the 3'-position. (C) 2004 Elsevier Ltd. All rights reserved.