Beckmannrearrangement of ketoxime catalyzed by acidic ionic liquid-N-methyl-imidazolium hydrosulfate was studied. Rearrangement of benzophenone oxime gave the desirable product with 45% yield at 90 °C. When co-catalyst P₂O₅ was added, the yield could be improved to 91%. The catalyst could be reused three cycles with the same efficiency. Finally, reactions of other ketoximes were also investigated
研究了酸性离子液体-N-甲基咪唑鎓硫酸氢盐催化酮肟的贝克曼重排。二苯甲酮肟的重排得到所需产物,在90℃下产率为45%。当加入助催化剂P 2 O 3时,产率可以提高到91%。该催化剂可以以相同的效率重复使用三个循环。最后,还研究了其他酮肟的反应。
Nickel-catalysed asymmetric hydrogenation of oximes
作者:Bowen Li、Jianzhong Chen、Dan Liu、Ilya D. Gridnev、Wanbin Zhang
DOI:10.1038/s41557-022-00971-8
日期:2022.8
corresponding chiral hydroxylamines remains challenging because of the labile N–O bond and inert C=N bond. Here we report an environmentally friendly, earth-abundant, transition-metal nickel-catalysed asymmetric hydrogenation of oximes, affording the corresponding chiral hydroxylamines with up to 99% yield, 99% e.e. and with a substrate/catalyst ratio of 1,000. Computational results indicate that the weak interactions