956-27-4Relevant academic research and scientific papers
Heavyweight "R-SMS-Phos" ligands in the olefins' hydrogenation arena
Zupancic, Borut,Mohar, Barbara,Stephan, Michel
supporting information; experimental part, p. 1296 - 1299 (2010/06/15)
"Chemical Equation Presented" A serles of enantiopure P-stereogenic 1,2-bis[(o-RO-phenyl)(phenyl)phosphino]ethane (R-SMS-Phos) ligands wherein R= i-Pr, i-Bu, tf-Bu, 3-Pen, and CH2TMS was assessed in the Rh(l)-catalyzed hydrogenation of an indic
DiPAMP's big brother "i-Pr-SMS-Phos" exhibits exceptional features enhancing rhodium(I)-catalyzed hydrogenation of olefins
Stephan, Michel,Sterk, Damjan,Mohar, Barbara
supporting information; scheme or table, p. 2779 - 2786 (2010/03/25)
Switching Knowles DiPAMP's {DiPAMP = l,2-bis[(o-anisyl)(phenyl)phosphino] ethane} MeO groups with i-PrO ones led to the iPr-SMS-Phos {i-Pr-SMS-Phos = l,2-bis[(o-isopropoxyphenyl)(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-a-amido acids, itaconates, acrylates, enamides, enol acetates, α,α-diarylethylenes, etc). The rhodium(I)-(i-PrSMS-Phos) catalytic profile was investigated revealing its structural attributes and robustness, and in contrast to the usual trend, 31P NMR analysis revealed that its methyl (Z)-α-acetamidocinnamate (MAC) adduct consisted of a reversed diastereomeric ratio of 1.4:1 in favour of the most reactive diastereomer.
Enantioselectivity of Pseudomonas cepacia lipase for the acetylation of 2-hydroxy carboxylic acid esters+
Sundholm, Oskari,Kanerva, Liisa T.
, p. 625 - 640 (2007/10/03)
Structurally different ethyl or methyl 2-hydroxy carboxylates were resolved by Pseudomonas cepacia lipase-catalysed acetylations with vinyl acetate in diethylether. One type of the alcoholic substrates (2-hydroxy-2-arylacetates and 2-hydroxy-3-arylpropinates) contained a HO-group at the stereocentre. These compounds were resolved with high enantioselectivity (ee 91 → 99) at ca. 50% conversion. The other alcoholic substrates ((threo-2-hydroxy-3-methylbutyrate and threo- or erythro-2-hydroxy-3-aryl-3-arylthio(or aryloxy)propionates) with two stereocentres generally resulted in enantiopure products and the reactions stopped at 50 % conversion.
Synthesis and enantioselective hydrogenation of α-acyloxyacrylates
Schmidt,Langner,Kirschbaum,Braun
, p. 1138 - 1140 (2007/10/02)
Numerous α-acyloxyacrylates have been prepared by Wittig-Horner reaction of aldehydes and ethyl 2-acyloxy-2-(diethoxyphosphoryl)acetates which were easily obtained from glyoxylic acid hydrate. The formed α-acyloxyacrylates were subsequently hydrogenated enantioselectively using Rh-DIPAMP and Ru-BINAP (ee = 82-98%) to furnish the corresponding α-acyloxycarboxylates.
