Mechanistic Studies on a Dipeptide-Promoted Asymmetric Cyclopropanation of Unfunctionalized Olefins
摘要:
This paper describes mechanistic studies on a dipeptide-promoted asymmetric cyclopropanation system for unfunctionalized olefins. Zinc species generated from the deprotonation of the N-H of the dipeptide ligand have been investigated by NMR and X-ray structure studies and are likely to be responsible for asymmetric cyclopropanation. ZnI2 plays an important role in promoting the reaction.