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Volumn 16, Issue 48, 2010, Pages 14335-14347

C2-symmetric chiral disulfoxide ligands in rhodium-catalyzed 1,4-addition: From ligand synthesis to the enantioselection pathway

Author keywords

asymmetric catalysis; chiral auxiliaries; conjugate addition; enantioselectivity; sulfoxides

Indexed keywords

ASYMMETRIC CATALYSIS; ASYMMETRIC INDUCTION; CATALYTIC BEHAVIOR; CATALYTIC CYCLES; CHIRAL AUXILIARIES; CONJUGATE ADDITION; CRYSTALLOGRAPHIC STUDIES; DENSITY FUNCTIONAL THEORY CALCULATIONS; ENANTIOSELECTION; IN-DEPTH STUDY; OPTICAL PURITY; PHENYLBORONIC ACIDS; RHODIUM COMPLEXES; RHODIUM-CATALYZED; SULFOXIDES;

EID: 78651243540     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.201001749     Document Type: Article
Times cited : (56)

References (135)
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    • Both (1R,2S,5R)-(-)-menthyl (S)-p-toluenesulfinate and (1S,2R,5S)-(+)-menthyl (R)-p-toluenesulfinate can be purchased in high deratio from various chemical suppliers.
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    • The protocol reported in the Supporting Information of this manuscript gives superior yields of p-Tol-BINASO compared to the procedures given in reference [12a] and reference [16a]
    • The protocol reported in the Supporting Information of this manuscript gives superior yields of p-Tol-BINASO compared to the procedures given in reference [12a] and reference [16a].
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    • note
    • The crystal structures of ligands 19a and 19c show that these compounds are not enantiopure as expected (see purity of starting sulfinate 10). The major isomer was determined indirectly by HPLC and the catalytic results (see: reduction to disulfides and enantiomeric purity of ligands) to have the S,S-configuration at the sulfur centers. Likewise, ligand 23b contains the R,R-configured isomer as the major component.
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    • The disulfides 24 - 31 were subjected to identical reaction conditions as for their synthesis using elevated temperatures (up to 100°C) and extended reaction times (up to 2 days). No change in enantiomeric ratios was found as determined by HPLC analysis
    • The disulfides 24-31 were subjected to identical reaction conditions as for their synthesis using elevated temperatures (up to 100°C) and extended reaction times (up to 2 days). No change in enantiomeric ratios was found as determined by HPLC analysis.
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    • The other isomers of ligands 16-23 did not form clean complexes of the corresponding dimers and (DNHS)-conformers of the ligands were not used in our study. Our hypothesis is that steric repulsion from the sulfoxide groups hinders formation of the bridged complexes, a phenomenon that was also observed for atropisomeric diphosphine ligands incorporating bulky aromatic groups on phosphorus atoms, see:, T. Ohshima, H. Tadaoka, K. Hori, N. Sayo, K. Mashima, Chem. Eur. J. 2008, 14, 2060.
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    • I complexes, donor-acceptor properties of diphosphines have been investigated by studying the carbonyl stretching frequencies of [(diphosphine)RhCl(CO)] compounds, see
    • I complexes, donor-acceptor properties of diphosphines have been investigated by studying the carbonyl stretching frequencies of [(diphosphine)RhCl(CO)] compounds, see
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    • The differences in average stretching frequencies are big enough to exclude misinterpretation, owing to different bite angles (and resulting geometry/orbital overlap differences) between the complexes. For stretching frequencies of other rhodium-dicarbonyl complexes with chelating diphosphine ligands, see, for example:, T. A. Betley, J. C. Peters, Angew. Chem. 2003, 115, 2487
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    • For discussions on the effect of dihedral angles on selectivity and reactivity, see for example
    • For discussions on the effect of dihedral angles on selectivity and reactivity, see for example
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    • A recent report on the use of modified atropisomeric diphosphines as ligands for rhodium-catalyzed 1,4-addition in toluene/water has come to similar conclusions, see
    • A recent report on the use of modified atropisomeric diphosphines as ligands for rhodium-catalyzed 1,4-addition in toluene/water has come to similar conclusions, see:, T. Korenaga, K. Osaki, R. Maenishi, T. Sakai, Org. Lett. 2009, 11, 2325.
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    • A similar effect has been proposed for conjugated additions with rhodium quinonoid catalysts, see
    • A similar effect has been proposed for conjugated additions with rhodium quinonoid catalysts, see
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    • Details of DFT calculations are included in the Supporting Information
    • Details of DFT calculations are included in the Supporting Information.
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    • note
    • -1 higher than the barrier for the direct transfer from the water molecule to the substrate, supporting the low energy mechanism pathway shown in Figure8.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.