Rhodium(III)‐Catalyzed, CH Activated Annulation to Form Isocoumarins and
<i>α</i>
‐Pyrones using the ON Bond as an Internal Oxidant
作者:Xing Guang Li、Kai Liu、Gang Zou、Pei Nian Liu
DOI:10.1002/adsc.201400200
日期:2014.5.5
A mild, efficient and regioselective CHactivation‐based intermolecular redox‐neutral annulation of O‐benzoylhydroxylamines and internal alkynes has been achieved. The protocol employs an ONbond as the internaloxidant and leads to isocoumarins and α‐pyrones.
Transition‐Metal Free Electrophilic Aminations of Polyfunctional<i>O</i>‐2,4,6‐Trimethylbenzoyl Hydroxylamines with Zinc and Magnesium Organometallics
作者:Alisa S. Sunagatullina、Andreas Hess、Alexander Kremsmair、Yifan Li、Yi‐Hung Chen、Paul Knochel
DOI:10.1002/anie.202304445
日期:2023.7.24
Various zinc and magnesium reagents were successfully aminated using O-2,4,6-trimethylbenzoyl hydroxylamines (O-TBHAs) leading to the corresponding tertiary alkyl amines in 52–99 % yield without any additional transition-metal catalyst. This reaction was extended to the preparation of optically enriched amines (up to 88 % ee) starting from enantioenriched secondary alkylmagnesium reagents of the type