A general, straightforward, and practicalaccess to multi-substituted chiral quinoxalin-2-ones has been achieved based on the copper(I) chloride-dimethylethylenediamine (DMEDA) catalyst system. With the use of 1 mol% copper(I) chloride, structurally diverse quinoxalin-2-ones were generated with high optical purity from readily available starting materials, 2-haloanilines and α-amino acids, in a one-pot
Iron- or Zinc-Mediated Synthetic Approach to Enantiopure Dihydroquinoxalinones
作者:Dazhi Li、Thierry Ollevier
DOI:10.1002/ejoc.201801639
日期:2019.2.14
A general and efficient synthesis of dihydroquinoxalinones has been developed. The reductive cyclization of N‐(o‐nitroaryl)amino esters was performed by using iron and zinc metal under mild conditions in a water/ethyl acetate mixture. The final products were obtained in moderate to high yields and high enantiomeric purity.