Achiral Trisubstituted Thioureas as Secondary Ligands to Cu
<sup>I</sup>
Catalysts: Direct Catalytic Asymmetric Addition of α‐Fluoronitriles to Imines
作者:Pandur Venkatesan Balaji、Lennart Brewitz、Naoya Kumagai、Masakatsu Shibasaki
DOI:10.1002/anie.201812673
日期:2019.2.25
effective hydrogen‐bonding catalysts over the last two decades, and they are broadly utilized in asymmetric catalysis. We report that achiral trisubstituted thioureas function as beneficial secondary ligands to CuI catalysts, thereby enabling highly diastereo‐ and enantioselective addition of α‐fluoronitriles to imines. The structure of the thiourea significantly affects the reaction outcome, and kinetic experiments
在过去的二十年中,硫脲已成为有效的氢键催化剂,并广泛用于不对称催化中。我们报告说,非手性三取代硫脲可作为Cu I催化剂的有益二级配体,从而使α-氟腈高度非对映异构和对映选择性地加到亚胺上。硫脲的结构显着影响反应结果,动力学实验表明,硫脲通过与Cu I配合物结合而增强了立体控制。反应产物可以很容易地转化为带有氟化四取代立体中心的有价值的β-氨基酸衍生物。