[GRAPHICS]Platinum oxide was found to be a versatile and powerful hydrosilylation catalyst upon a wide variety of functionalized alkenes and especially aminated alkenes. Moreover, highly reproducible results and easy removal make this new catalyst a useful tool for hydrosilylation reaction.
Manganese‐Catalyzed Hydrofunctionalization of Alkenes
作者:Jonathan R. Carney、Barry R. Dillon、Leonie Campbell、Stephen P. Thomas
DOI:10.1002/anie.201805483
日期:2018.8.13
The manganese‐catalyzed hydrosilylation and hydroboration of alkenes has been developed using a single manganese(II) precatalyst and reaction protocol. Both reactions proceed with excellent control of regioselectivity and in high yields across a variety of sterically and electronically differentiated substrates (25 examples). Alkoxide activation, using NaOtBu, was key to precatalyst activation and
锰催化烯烃的氢化硅烷化和氢硼化反应是使用单一的锰(II)预催化剂和反应方案开发的。两种反应均能很好地控制区域选择性,并能在多种空间和电子分化的底物上获得高收率(25个实例)。使用NaO t Bu进行的醇盐活化是催化剂前活化和反应活性的关键。对于这两种已开发的方法,催化剂的负载量都低至0.5 mol%,从而实现了跨各种官能团和以克为单位的催化作用。
Asymmetric Hydrosilylation of Alkenes with Alkoxyhydrosilanes Catalyzed by Chiral Bis(oxazolinyl)phenyl-Rhodium Complex
Asymmetric addition of alkoxyhydrosilanes to styrene derivatives was examined with chiral bis(oxazolinyl)phenyl-rhodium complex to give moderate ratios (up to 77:23) of α- and β-adducts and high enantioselectivity (up to 95% for the α-adduct).