Iridium-Catalyzed Asymmetric Hydrogenation of β,γ-Unsaturated γ-Lactams: Scope and Mechanistic Studies
作者:Qianjia Yuan、Delong Liu、Wanbin Zhang
DOI:10.1021/acs.orglett.7b00171
日期:2017.3.3
asymmetric hydrogenation of β,γ-unsaturated γ-lactams using an iridium–phosphoramidite complex is reported. The chiral γ-lactams were obtained in excellent yields and enantioselectivities (up to 99% yield and 99% ee). The mechanistic studies indicated that the reduced products were obtained via the hydrogenation of the N-acyliminium cations, generated from β,γ-unsaturated γ-lactams, which was verified
据报道,使用铱-亚磷酰胺络合物可以有效地不对称地氢化β,γ-不饱和γ-内酰胺。以优异的产率和对映选择性(高达99%的产率和99%的ee)获得手性γ-内酰胺。机理研究表明,还原产物是通过氢化由β,γ-不饱和γ-内酰胺生成的N-酰基亚胺阳离子而获得的,该产物已通过1 H NMR分析证实。反应在0.1mol%的降低的催化剂负载下进行,并且还原的产物可以转化为两种潜在的生物活性化合物。提供了合成手性γ-内酰胺的新途径。