Zirconium‐Salan Catalyzed Enantioselective
<i>α</i>
‐Hydroxylation of
<i>β</i>
‐Keto Esters
作者:Jie Chen、Haiyang Gu、Xueying Zhu、Wonwoo Nam、Bin Wang
DOI:10.1002/adsc.202000290
日期:2020.7.29
C2‐symmetric salan ligands and cumene hydroperoxide as an oxidant, affording synthetically valuable hydroxylation products in high yields (up to 99%) with excellent enantioselectivities (up to 99% ee) under mild reaction conditions. In mechanistic studies, we have shown that (1) a Zr(IV)‐salan complex was generated in situ as the active catalyst responsible for the chiralinduction, (2) the transfer
Catalytic Asymmetric Oxidation of Amines to Hydroxylamines
作者:Gang Wang、Tian Chen、Kuiyong Jia、Wencheng Ma、Chen-Ho Tung、Lei Liu
DOI:10.1021/jacs.3c09172
日期:2023.10.11
titanium-catalyzed asymmetric oxidation of racemic amines providing a broad range of structurally diverse chiral hydroxylamines with excellent chemo- and enantioselectivity. Notably, hydroxylamines bearing diverse substituent patterns on the stereocenters, including α,α-ester-alkyl, α,α-amide-alkyl, α,α-aryl-alkyl, α,α-alkynyl-alkyl, and α,α-dialkyl, are well tolerated with good functional group compatibility