.omega.-[(4,6-Diphenyl-2-pyridyl)oxy]alkanoic acid derivatives: a new family of potent and orally active LTB4 antagonists
摘要:
A series of omega-[(4,6-diphenyl-2-pyridyl)oxy]alkanoic acid derivatives was prepared which inhibited the binding of leukotriene B4 to its receptors on guinea pig spleen membranes and on human polymorphonuclear leukocytes (PMNs) and selectively antagonized the LTB4-induced elastase release in human PMNs. On the basis of these three screens, a structure-activity relationship was investigated. Alpha-Substitution on the carboxylic acid side chain led to only small changes in the binding affinities but greatly enhanced the LTB4 antagonist activity. Substitution on the phenyl rings was also evaluated. The terminal carboxylic acid function can be replaced by a tetrazole ring without loss in activity. The beat in vitro LTB4 antagonists of this series were investigated in vivo in the inhibition of LTB4-induced leukopenia in rabbits. Compound 9b (RP69698) displayed potent LTB4 antagonist activity, after oral administration, with an ED50 value of 6.7 mg/kg.
A new method for free radical methylation of pyrimidinones and pyridinones with dicumylperoxide (DCP) under metal-free condition is introduced. A 50 g-scale reaction could be performed safely at desired...
alkoxycarbonylation of indoles, pyrimidinones, and pyridinones with alkyl carbazates is reported. The reactions proceed through a radical process to afford regioselectively 3-carboxylated indoles, 5-carboxylated pyrimidinones, and 3-carboxylated pyridinones in moderate to good yields under mild reaction conditions. Mn(OAc)3-mediated alkoxycarbonylation of indoles, pyrimidinones, and pyridinones with alkyl
(S53), 4n (S55), and 4o (S57). Original FIDs were located, and the spectra were reprocessed and have been replaced for the above compounds in the revised Supporting Information submitted with this correction. The spectra editing did not affect any of the conclusions of the published paper. The purities calculated on the basis of the revised spectra and corrected yields are as follows: 6b (99% purity
Direct regioselective Csp2–H trifluoromethylation of pyrimidinones and pyridinones
作者:Pei-Zhi Zhang、Cheng-Kun Li、Guo-Yu Zhang、Ling Zhang、Yao-Jia Jiang、Jian-Ping Zou
DOI:10.1016/j.tet.2016.04.048
日期:2016.6
pyrimidinones and 3-trifluoromethyl pyridinones in moderate to good yields was described. The reaction showed that the steric hindrance due to bulky groups adjacent to the position of attack by the trifluoromethylradical had important influence on the yield.
描述了使用CF 3 SO 2 Na / Mn(OAc)3进行嘧啶酮和吡啶酮的直接区域选择性C sp2- H三氟甲基化,以中等至良好的产率提供了5-三氟甲基嘧啶酮和3-三氟甲基吡啶酮。该反应表明,由于三氟甲基自由基的进攻位置附近的庞大基团而引起的位阻对产率有重要影响。