Chiral Surfactant-Type Catalyst: Enantioselective Reduction of Long-Chain Aliphatic Ketoesters in Water
作者:Zechao Lin、Jiahong Li、Qingfei Huang、Qiuya Huang、Qiwei Wang、Lei Tang、Deying Gong、Jun Yang、Jin Zhu、Jingen Deng
DOI:10.1021/acs.joc.5b00241
日期:2015.5.1
ligands were designed and synthesized. The rhodium complexes with the ligands were applied to the asymmetric transfer hydrogenation of broad range of long-chained aliphatic ketoesters in neat water. Quantitative conversion and excellent enantioselectivity (up to 99% ee) was observed for α-, β-, γ-, δ- and ε-ketoesters as well as for α- and β-acyloxyketone using chiral surfactant-type catalyst 2. The CH/π
设计并合成了一系列两亲性配体。具有配体的铑配合物被用于纯水中宽范围的长链脂族酮酸酯的不对称转移氢化。使用手性表面活性剂型催化剂2观察到α-,β-,γ-,δ-和ε-酮酸酯以及α-和β-酰氧基酮的定量转化率和出色的对映选择性(高达99%ee)。在金属硅油核中,催化剂与底物之间的长脂肪链之间的CH /π相互作用和长脂肪链的强疏水相互作用在催化过渡态中起着关键作用。胶束中金属催化位点与核心的疏水微环境之间的协同作用有助于实现高立体选择性。