Phosphorus Coordination Chemistry in Catalysis: Air Stable P(III)-Dications as Lewis Acid Catalysts for the Allylation of C–F Bonds
作者:Saurabh S. Chitnis、James H. W. LaFortune、Haley Cummings、Liu Leo Liu、Ryan Andrews、Douglas W. Stephan
DOI:10.1021/acs.organomet.8b00686
日期:2018.12.24
Modification of C–F bonds with main-group catalysts has typically employed electron-deficient Lewis superacids in high oxidation states, and the challenges of preparing and handling such species have prevented broader adoption of metal-free reduction protocols. Here, we show that a hemilabile ligand coordinated to an easily accessed P(III) center imparts air stability without sacrificing the ability
用主族催化剂修饰C-F键通常使用处于高氧化态的缺电子的路易斯超酸,制备和处理此类物质的挑战阻碍了无金属还原方案的广泛采用。在这里,我们表明与易达到的P(III)中心配位的半不稳定配体赋予了空气稳定性,而又不影响激活CF键的能力。使用P(III)配合物在台式条件下实现了苄基氟与烯丙基硅烷的催化CC偶联。配位化学原理对主酸路易斯酸的这种应用揭示了控制催化的新策略。