Synthesis and evaluation of 5-lipoxygenase translocation inhibitors from acylnitroso hetero-Diels–Alder cycloadducts
作者:Joshua K. Bolger、Wen Tian、William R. Wolter、Wonhwa Cho、Mark A. Suckow、Marvin J. Miller
DOI:10.1039/c0ob00714e
日期:——
Acylnitroso cycloadducts have proven to be valuable intermediates in the syntheses of a plethora of biologically active molecules. Recently, organometallic reagents were shown to open bicyclic acylnitroso cycloadducts and, more interestingly, the prospect of highly regioselective openings was raised. This transformation was employed in the synthesis of a compound with excellent inhibitory activity against 5-lipoxygenase ((±)-4a, IC50 51 nM), an important mediator of inflammation intimately involved in a number of disease states including asthma and cancer. Optimization of the copper-mediated organometallic ring opening reaction was accomplished allowing the further exploration of the biological activity. Synthesis of a number of derivatives with varying affinity for metal binding as well as pendant groups in a range of sizes was accomplished. Analogues were tested in a whole cell assay which revealed a subset of the compounds to be inhibitors of enzyme translocation, a mode of action not previously known and, potentially, extremely important for better understanding of the enzyme and inhibitor development. Additionally, the lead compound was tested in vivo in an established colon cancer model and showed very encouraging anti-tumorogenic properties.
酰亚硝基环加合物已被证明是合成大量生物活性分子的有价值的中间体。最近,有机金属试剂被证明可以打开双环酰基亚硝基环加合物,更有趣的是,提出了高度区域选择性打开的前景。这种转化被用于合成一种对 5-脂氧合酶((±)-4a,IC50 51 nM)具有优异抑制活性的化合物,5-脂氧合酶是一种重要的炎症介质,与包括哮喘和癌症在内的许多疾病状态密切相关。铜介导的有机金属开环反应的优化得以完成,从而可以进一步探索生物活性。合成了许多对金属结合具有不同亲和力以及各种尺寸的侧基的衍生物。在全细胞测定中对类似物进行了测试,结果显示化合物的一个子集是酶易位的抑制剂,这是一种以前未知的作用模式,并且对于更好地了解酶和抑制剂的开发可能极其重要。此外,先导化合物在已建立的结肠癌模型中进行了体内测试,并显示出非常令人鼓舞的抗肿瘤特性。