作者:Jan Otevrel、Pavel Bobal
DOI:10.1021/acs.joc.7b00079
日期:2017.8.18
We have developed a novel multifunctional C2-symmetric biphenyl-based diamine-tethered bis(thiourea) organocatalyst, which was tested in the asymmetric Henry reaction. Under thoroughly optimized conditions, the catalyst provided exceptionally high yields and excellent enantioselectivities especially for electron-deficient aromatic and heterocyclic substrates. Due to a high affinity of the catalyst
我们已经开发了一种新型的多功能的C 2对称联苯基二胺系双(硫脲)有机催化剂,在不对称亨利反应中进行了测试。在充分优化的条件下,该催化剂可提供极高的收率和出色的对映选择性,尤其是对于电子不足的芳族和杂环底物而言。由于催化剂对硅胶的亲和力高,因此简单的无色谱硝基硝基醇分离方法是可行的。进行了初步的动力学和光谱实验,以完成有机催化的硝基醛缩醛化过程的机理图。最后,已开发的合成策略成功地应用于对映纯的催化对映选择性合成(S)-益康唑和(R)-米拉贝隆是后期中间体。