Chameleonic reactivity of α-amino nitrile-derived ureas. Synthesis of highly functionalized imidazolidin-2-one and imidazolidine-2,4-dione derivatives
作者:Pilar Ventosa-Andrés、Juan A. González-Vera、M. Teresa García-López、Rosario Herranz
DOI:10.1016/j.tet.2014.03.082
日期:2014.5
nitrile-derived ureas for the synthesis of imidazolidin-2-one derivatives has been studied in the context of a medicinal chemistry project focused on the search of antagonists of the thrombin receptor PAR1. In this study α-amino nitrile-derived ureas have shown chameleonic reactivity. Thus, under neutral, basic or mild acid media they cyclize to 4-iminoimidazolidin-2-one derivatives, which tautomerize
在医学化学项目的背景下,研究了α-氨基腈衍生的尿素在合成咪唑烷基-2-酮衍生物方面的潜力,该项目的重点是寻找凝血酶受体PAR1的拮抗剂。在这项研究中,α-氨基腈衍生的尿素已显示出Chameleonic反应性。因此,在中性,碱性或温和的酸性介质下,它们环化成4-亚氨基咪唑烷基-2-酮衍生物,其互变异构成4-氨基-2,3-二氢-1 H-咪唑-2-酮。该互变异构现象引发咪唑烷环的C 5上的差向异构化及其氧化。然而,它们通过无表观的两步水解作用,可在强酸介质下产生稳定的高度官能化乙内酰脲衍生物。