Design of Reversible, Cysteine-Targeted Michael Acceptors Guided by Kinetic and Computational Analysis
作者:Shyam Krishnan、Rand M. Miller、Boxue Tian、R. Dyche Mullins、Matthew P. Jacobson、Jack Taunton
DOI:10.1021/ja505194w
日期:2014.9.10
that covalently modify a cysteine thiol often show enhanced pharmacological potency and selectivity. Although reversible Michael acceptors have been reported, the structural requirements for reversibility are poorly understood. Here, we report a novel class of acrylonitrile-based Michael acceptors, activated by aryl or heteroaryl electron-withdrawing groups. We demonstrate that thiol adducts of these acrylonitriles
共价修饰半胱氨酸硫醇的亲电探针通常表现出增强的药理学效力和选择性。尽管已经报道了可逆迈克尔受体,但对可逆性的结构要求知之甚少。在这里,我们报告了一类新的基于丙烯腈的迈克尔受体,由芳基或杂芳基吸电子基团激活。我们证明这些丙烯腈的硫醇加合物以超过 3 个数量级的速率进行 β-消除。这些速率与计算出的相应碳负离子的质子亲和力成反比,从而能够以可预测的方式调整硫醇-迈克尔反应的内在可逆性。我们将这些原理应用于设计具有改进特性的新型可逆共价激酶抑制剂。一种此类抑制剂的共晶结构揭示了 1,2,4-三唑激活基团与激酶之间的特定非共价相互作用。我们的实验和计算研究能够设计新的迈克尔受体,扩展可逆的、半胱氨酸靶向的亲电子试剂的调色板。