Plus‐Size DiPAMP Hybrids for Advanced Rhodium(I)‐Catalyzed Hydrogenation: The 2RBigFUS Model
作者:Barbara Mohar、Marko Jeran、Michel Stephan
DOI:10.1002/ejoc.202300444
日期:2023.10.2
Multipurpose hydrogenation catalysts, endowed with a top-performance under economical conditions, is the outcome of Knowles’ DiPAMP evolved version. Bulky rather than super-thin Ligand models seem to fit better for a broader scope of Rh(I)-L catalysis. Application to enantiomeric α- or β-amino acids, α-arylpropionic acids, β-phenylbutanoic acid, methylsuccinic acid, and derivatives, is showcased.
Impact on Hydrogenation Catalytic Cycle of the R Groups’ Cyclic Feature in “R-SMS-Phos”
作者:Borut Zupančič、Barbara Mohar、Michel Stephan
DOI:10.1021/ol101029s
日期:2010.7.2
A series of R-SMS-Phos ligands was evaluated in the Rh(I)-catalyzed hydrogenation of a set of olefins showing a marked influence of the cyclic nature and structure of the R groups. Overall, cPen- and Cy-SMS-Phos performed efficiently, while Ph- and Bn-SMS-Phos exhibited slower kinetics and furnished lower ee's also compared with C6F5CH2-SMS-Phos. The Rh(I)-(Cy-SMS-Phos) catalyst was screened under mild conditions displaying excellent enantioselectivities and high TOFs. Cases of catalysis under catalyst or substrate control were identified.