Enantioselective Hydrogenation of α-Dehydroamino Acid Esters Catalyzed by Rhodium Complexes with Chiral Bisaminophosphine Ligands
作者:Xianfeng Sun、Wei Li、Le Zhou、Xumu Zhang
DOI:10.1002/adsc.201000038
日期:——
A highly efficient strategy for the synthesis of a series of chiral bisaminophosphine ligands was well established with several remarkable features. The synthetic utility of these ligands was explored for rhodium‐catalyzed asymmetric hydrogenations of α‐dehydroamino acidesters. Up to 98% ee values were achieved for the enantioselectivesynthesis of aminocarboxylic acids and their derivatives, which
More electron donating, more rigid: A new highly electron‐donating P‐stereogenic bisphospholaneligand (ZhangPhos) was synthesized in a practical and highlyenantioselective manner from a commercially available chiral source. Better or comparable enantioselectivities and reactivities than TangPhos were achieved in rhodium‐catalyzed hydrogenation of various functionalized olefins (see scheme; nbd=3
Asymmetric Full Saturation of Vinylarenes with Cooperative Homogeneous and Heterogeneous Rhodium Catalysis
作者:Haibo Wu、Jianping Yang、Bram B. C. Peters、Luca Massaro、Jia Zheng、Pher G. Andersson
DOI:10.1021/jacs.1c09975
日期:2021.12.8
enabled by a ligand accelerated effect, accounted for the facial selectivity in the consecutive arene hydrogenation. Tuning the ratio between the phosphineligand and the rhodium precursor controlled the formation of homogeneous and heterogeneous catalytic species that operate without interference from each other. The system is flexible in terms of both the chiral ligand and the nature of the external olefin
A concise and effective ruthenium-catalyzed asymmetric transferhydrogenation of β-substituted α-oxobutyrolactones has been developed, delivering a series of cis-β-substituted α-hydroxybutyrolactone derivatives with excellent yields, enantioselectivities, and diastereoselectivities. Two consecutive stereogenic centers were constructed in one step through dynamic kinetic resolution under basic conditions
A cobalt-catalyzed enantioselective deuteration provides α,β-dideuterio-α-amino acids in excellent enantioselectivity and almost complete deuteration, using deuterated methanol as cheap deuterium source.