In this work, the use of N-acyloxybenzamides as efficient acyl nitrene precursors under photoredox/iron dual catalysis is reported. The resulting acyl nitrenes could be captured by various types of C–H bonds and S- or P-containing molecules. Mechanism investigations suggested that the formation of the acyl nitrene from the N-acyloxybenzamide occurs by a photoredox process, and it is believed that in
在这项工作中,报道了在光氧化还原/铁双重催化下使用N-酰氧基苯甲酰胺作为有效的酰基氮烯前体。由此产生的酰基氮烯可以被各种类型的 C-H 键和含 S 或 P 的分子捕获。机理研究表明,由N-酰氧基苯甲酰胺形成酰基氮烯是通过光氧化还原过程发生的,并且认为在该氧化还原过程中,N-酰氧基苯甲酰胺的氧化 N-H 键断裂发生在还原性 N-O 键断裂之前N-酰氧基苯甲酰胺。
Development of novel adenosine receptor ligands based on the 3-amidocoumarin scaffold
With the aim of finding new adenosine receptor (AR) ligands presenting the 3-amidocoumarin scaffold, a study focusing on the discovery of new chemical entities was carried out. The synthesized compounds 1-8 were evaluated in radioligand binding (A(1), A(2A) and A(3)) and adenylyl cyclase activity (A(2B)) assays in order to determine their affinity for human AR subtypes. The 3-benzamide derivative 4 showed the highest affinity of the whole series and was more than 30-fold selective for the A(3) AR (K-i = 3.24 mu M). The current study supported that small structural changes in this scaffold allowed modulating the affinity resulting in novel promising classes of A(1), A(2A), and/or A(3) AR ligands. We also performed docking calculations in hA(2A) and hA(3) to identify the hypothetical binding mode for the most active compounds. In addition, some ADME properties were calculated in order to better understand the potential of these compounds as drug candidates. (C) 2015 Elsevier Inc. All rights reserved.