Rhodium-Catalyzed Enantioselective Hydrogenation of Unsaturated Phosphonates by ClickFerrophos Ligands
作者:Takashi Konno、Kenta Shimizu、Kenichi Ogata、Shin-ichi Fukuzawa
DOI:10.1021/jo300129m
日期:2012.4.6
Newly developed ClickFerrophos II ligands were applied in the hydrogenation of alpha,beta-unsaturated phosphonates. The use of a rhodium/ClickFerrophos II catalyst was examined in the hydrogenation of fimctionalized alpha,beta-unsaturated phosphonates and was revealed to be effective for beta-alkyl-beta-aryl or beta-dialkyl phosphonates, (Z)-beta-enolester phosphonates, and alpha-phenylethenyl phosphonates, producing the corresponding chiral phosphonates in good yields with high enantioselectivities (up to 96% ee).