Synthesis and evaluation of imidazole–dioxolane compounds as selective heme oxygenase inhibitors: Effect of substituents at the 4-position of the dioxolane ring
                                
                                    
                                        作者:Jason Z. Vlahakis、Maaike Hum、Mona N. Rahman、Zongchao Jia、Kanji Nakatsu、Walter A. Szarek                                    
                                    
                                        DOI:10.1016/j.bmc.2009.01.078
                                    
                                    
                                        日期:2009.3
                                    
                                    Several imidazole-dioxolane compounds were synthesized and evaluated as novel inhibitors of heme oxygenase (HO). These compounds, which include a series of substituted thiophenol and substituted phenol derivatives of (2R, 4S)-2-[2-(4-chlorophenyl)ethyl]-2-[(1H-imidazol-1-yl)methyl]-4-[(phenylsulfanyl)methyl]-1,3-dioxolane hydrochloride ( 3), in addition to smaller functionalized derivatives, continue our structure-activity studies by exploration of the aminothiophenol region ('northeastern region') in our original target structure azalanstat (1). In vitro, most of the compounds in this series were found to be highly potent inhibitors of the stress-induced isozyme HO-1 and the constitutive isozyme HO-2, showing only moderate selectivity for HO-1. Nevertheless, a few of the compounds displayed higher selectivity toward HO-1. None of the compounds having a larger appendage in the northeastern region were inhibitors of CYP2E1, whereas a compound having a relatively small fluorine substituent in this region did inhibit CYP2E1; all of the compounds tested exhibited high inhibitory potency against CYP3A1/3A2. (C) 2009 Elsevier Ltd. All rights reserved.