NEW ORTHO-FUNCTIONALIZED P-CHIRAL ARYLPHOSPHINES AND DERIVATIVES: THEIR PREPARATION AND USE IN ASYMMETRIC CATALYSIS
申请人:Stephan Michel
公开号:US20100099875A1
公开(公告)日:2010-04-22
The invention relates to novel organo phosphorus P-chiral optically active compounds of formula (I) having a hydroxyl, mercapto, amino, carboxyl, sulfonyl group on aryl near a phosphorus atom, to the preparation and the use thereof in then asymmetrical catalysis of unsaturated compounds. Novel acylphosphine optically pure ligands embodied in the form of transition metal complexes exhibit an increased activity and enantloselectivity, in particular in asymmetrical hydrogenation, in comparison with the same type Uganda such as DiPAMP.
Heavyweight “R-SMS-Phos” Ligands in the Olefins’ Hydrogenation Arena
作者:Borut Zupančič、Barbara Mohar、Michel Stephan
DOI:10.1021/ol100184p
日期:2010.3.19
A series of enantiopure P-stereogenic 1,2-bis[(o-RO-phenyl)(phenyl)phosphino]ethane (R-SMS-Phos) ligands wherein R= i-Pr, i-Bu, t-Bu, 3-Pen, and CH2TMS was assessed in the Rh(I)-catalyzed hydrogenation of an indicative set of olefins. The best performing t-Bu-SMS-Phos ligand was screened against a wide range of representative classes of standard and new olefinic substrates such as dehydroamido esters
DiPAMPâs Big Brother â<i>i-</i>Pr-SMS-Phosâ Exhibits Exceptional Features Enhancing Rhodium(I)-Catalyzed Hydrogenation of Olefins
作者:Michel Stephan、Damjan SÌterk、Barbara Mohar
DOI:10.1002/adsc.200900621
日期:2009.11
Switching Knowles DiPAMP’s DiPAMP=1,2-bis[(o-anisyl)(phenyl)phosphino]-ethane} MeO groups with i-PrO ones led to the i-Pr-SMS-Phos i-Pr-SMS-Phos=1,2-bis[(o-isoprop- oxyphenyl)(phenyl)phosphino]ethane} ligand which displayed a boosted catalyst activity coupled with an enhanced enantioselectivity in the rhodium(I)-catalyzed hydrogenation of a wide-range of representative olefinic substrates (dehydro-α-amido
Asymmetric synthesis of SMS-Phos series’ precursor and a naphthalene analogue
作者:Michel Stephan、Barbara Modec、Barbara Mohar
DOI:10.1016/j.tetlet.2010.12.106
日期:2011.3
An efficient and high-yielding (up to 57% overall yield) asymmetric route to enantiopure P-stereogenic 1,2-bis[(o-hydroxyaryl)(phenyl)phosphino-P-borane]ethanes wherein aryl = phenyl and naphthyl, is presented. The occurring P-stereomutation is confirmed through X-ray crystal structure analysis of key intermediates.
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.