Stereocontrolled Synthesis of a Potential Transition-State Inhibitor of the Salicylate Synthase MbtI from <i>Mycobacterium tuberculosis</i>
作者:Zheng Liu、Feng Liu、Courtney C. Aldrich
DOI:10.1021/acs.joc.5b00455
日期:2015.7.2
chorismate into salicylic acid via isochorismate. We report the design, synthesis, and biochemical evaluation of an inhibitor based on the putative transition state (TS) for the isochorismatase partial reaction of MbtI. The inhibitor mimics the hypothesized charge buildup at C-4 of chorismate in the TS as well as C–O bond formation at C-6. Another important design element of the inhibitor is replacement of
分支杆菌素是结核分枝杆菌(Mtb)产生的小分子铁螯合剂(铁载体))进行铁动员。双功能水杨酸酯合成酶MbtI通过异丁烯酸将主要代谢物分支酸水合物转化为水杨酸,从而催化分枝杆菌素生物合成的第一步。我们报告的设计,合成和生化评估基于MbtI的等渗线酶部分反应的假定过渡态(TS)的抑制剂。该抑制剂模拟TS中分支酸在C-4处的假定电荷积累以及在C-6处的CO键形成。抑制剂的另一个重要设计要素是用稳定的C键联的丙酸酯等排物代替分支酸中不稳定的丙酮酸侧链。我们开发了高度官能化的环己烯抑制剂的立体控制合成方法,该方法具有使用烯醇钛的不对称醛醇缩合反应的特征,叔丁烷亚磺酰基醛亚胺和闭环烯烃复分解是关键步骤。