Hydroxyl Assisted Rhodium Catalyst Supported on Goethite Nanoflower for Chemoselective Catalytic Transfer Hydrogenation of Fully Converted Nitrostyrenes
reaction duration. The catalytic selectivity for the reduction of the nitro group towards vinyl group was investigated by the control experiments and FT‐IR analysis. We have found that the abundant hydroxyl groups in the α‐FeOOH may contribute to the improvement of catalytic activity and selectivity. Furthermore, the catalyst exhibits excellent stability and keeps its catalytic performance even after
Enantioselective, Catalytic Vicinal Difluorination of Alkenes
作者:Felix Scheidt、Michael Schäfer、Jérôme C. Sarie、Constantin G. Daniliuc、John J. Molloy、Ryan Gilmour
DOI:10.1002/anie.201810328
日期:2018.12.10
The enantioselective, catalytic vicinal difluorination of alkenes is reported by II/IIII catalysis using a novel, C2‐symmetric resorcinol derivative. Catalyst turnover via in situ generation of an ArIIIIF2 species is enabled by Selectfluor oxidation and addition of an inexpensive HF–amine complex. The HF:amine ratio employed in this process provides a handle for regioselective orthogonality as a function
I / I III催化使用新型C 2对称间苯二酚衍生物进行烯烃的对映选择性催化邻位二氟化反应。通过Selectfluor氧化和添加廉价的HF-胺络合物,可以原位生成ArI III F 2物种进行催化剂转换。此过程中使用的HF:胺比率为布朗选择性酸度的区域选择性正交性提供了一个解决方案。公开了从1,1-二氟化途径(基因)向所需的1,2-二氟化途径(邻位)的选择性逆转(两个方向均> 20:1)。用电子不足的苯乙烯进行验证有助于产生古老的CF 3的手性生物等排体药物发现中普遍使用的单元(20个示例,最高94:06 er)。还使用p- TolI(高达> 95%的收率)显示了反应的非手性变体。