Enantioselective Addition of Dialkylzinc to Aromatic Aldimines Mediated by Camphor-Derived Chiral β-Amino Alcohols
作者:Wei-Ming Huang、Biing-Jiun Uang
DOI:10.1002/asia.201403240
日期:2015.4
The enantioselective addition of diethylzinc or dimethylzinc to N‐(diphenylphosphinoyl)imines mediated by 1 or 2 could be achieved in high yields (70–97 %) and enantioselectivities (85–98 % ee). The catalytic loading of 1 or 2 a could be reduced to 10 mol % for methylation or ethylation of imines in high yields and enantioselectivities (79–96 %) when the reaction was conducted in the presence of 1
bond-forming reactions is of vital importance. However, previous methods all have their own limitations and drawbacks. Herein, we disclose an efficient, green, and direct photocatalytic phosphorylation of heteroatom nucleophiles under the irradiation of 12 W blue LEDs at room temperature using acid red 51 as the photocatalyst and eco-friendly air as the sole oxidant. The newly developed reaction shows broad
P(O)-杂原子成键反应的发展至关重要。然而,以前的方法都有其自身的局限性和缺点。在此,我们公开了在室温下使用酸性红 51 作为光催化剂和环保空气作为唯一氧化剂,在 12 W 蓝色 LED 照射下,杂原子亲核试剂的高效、绿色和直接光催化磷酸化。新开发的反应在无卤化物、碱、金属和添加剂的条件下显示出广泛的底物范围,为次膦氟化物、次膦酰胺、氨基磷酸酯和次膦酸酯提供了实用且可扩展的途径。磷酸化反应的机理研究表明,P(O)–H 试剂通过以下途径产生以磷为中心的自由基阳离子光催化单电子转移 (SET) 可能是参与这种转化的主要活性物质。