Rhodium(I)-Catalyzed Enantioselective Hydrogenation of Substituted Acrylic Acids with Sterically Similar β,β-Diaryls
作者:Yang Li、Kaiwu Dong、Zheng Wang、Kuiling Ding
DOI:10.1002/anie.201302349
日期:2013.6.24
Distinct differentiation: β,β‐Disubstituted acrylic acids with sterically similar geminal diaryl groups can be hydrogenated with excellent enantioselectivities in the presence of a RhI complex formed in situ with two‐component ligands, a chiral secondary phosphineoxide (SPO) and an achiral phosphine (Ph3P). The sense of asymmetric induction was found to be controlled by the substrate configuration
An additive-free enantioselective hydrogenation of β,β-disubstituted unsaturated carboxylicacids catalyzed by the Rh–(R,R)-f-spiroPhos complex has been developed. Under mild conditions, a wide scope of β,β-disubstituted unsaturated carboxylicacids were hydrogenated to the corresponding chiral carboxylicacids with excellent enantioselectivities (up to 99.3% ee). This methodology was also successfully