Structural exploration of cinnamate-based phosphonic acids as inhibitors of bacterial ureases
作者:Vassilis Ntatsopoulos、Katarzyna Macegoniuk、Artur Mucha、Stamatia Vassiliou、Łukasz Berlicki
DOI:10.1016/j.ejmech.2018.09.074
日期:2018.11
introduce the terminal phosphonic side chain functionality to the α,β-unsaturated system, we currently report the synthesis and activity of an extended series of compounds. Cinnamates modified with 3-phosphonopropyl and 4-phosphonobutyl side chains were obtained in a convenient two-step procedure, which involved Pd-mediated transformations of the Morita-Baylis-Hillman bromides as the key substrates. The
肉桂酸的共轭体系,被膦酰基烷基残基α取代,先前已被验证为可提供细菌脲酶最有效的有机磷抑制剂之一的支架。遵循使用Morita-Baylis-Hillman加合物将末端膦酸侧链官能团引入α,β-不饱和系统的想法,我们目前报道了一系列扩展化合物的合成和活性。通过方便的两步程序获得了用3-膦酰基丙基和4-膦酰基丁基侧链修饰的肉桂酸酯,该过程涉及Pd介导的森田-巴利斯-希尔曼溴化物的转化为关键底物。通过Stille与锡烷偶联实现末端烯基片段的引入,然后进行串联CP键形成/氧化过程。 在活性分子中鉴定出巴氏芽孢杆菌尿素酶(K i = 0.509μM)。另外,奇异变形杆菌尿素酶的抑制剂以微摩尔水平影响细菌的生长。基于结构-活性关系和抑制机理,我们提出了慢结合化合物的非典型混合作用方式。我们假设膦酸基团和主链双键之间的分子距离允许双重活性:酸性基团与镍离子的络合以及形成活性位点盖的半胱氨酸的迈克尔加成。