Asymmetric Reactions Catalyzed by Chiral Metal Complexes. LXX. Steric and Electronic Effects of Substrates and Rhodium Chiral Catalysts in Asymmetric Cyclopropanation.
Asymmetric Reactions Catalyzed by Chiral Metal Complexes. LXX. Steric and Electronic Effects of Substrates and Rhodium Chiral Catalysts in Asymmetric Cyclopropanation.
作者:Kiyoshi YOSHIKAWA、Kazuo ACHIWA
DOI:10.1248/cpb.43.2048
日期:——
We have prepared several new, efficient, chiral N-acyl pyrrolidine carboxylic acid ligands for dirhodium-catalyzed asymmetric cyclopropanation and found that the steric and electronic effects of the rhodium(II) complexes and substrates influenced the enantioselectivity and catalytic activity. These electron-rich catalysts were shown to be efficient for asymmetric cyclopropanation using 1-chloro-1-fluoroethylene as a substrate.