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Prolines ion-tagged

Figure 4. Straightforward synthesis of onium ion-tagged prolines. Figure 4. Straightforward synthesis of onium ion-tagged prolines.
Onium ion-tagged proline catalysts 7 and 8 in [bmini][Tf2N] proved to be an excellent catalytic system for the direct asymmetric aldol reaction. The catalytic protocol developed makes use of use of a 6-fold lower amount of catalyst with respect to the proceeding reports based on the use of proline 12 and affords greater chemical yields and higher enantioselectivity. In particular, 8 in [bmim][Tf2N] gave better results compared both to the use of proline in the same IL and of 7 in DMSO. ... [Pg.43]

For example, onium ion-tagged prolines have been synthesized and their catalytic activity in direct asymmetric aldol condensation was initially studied in molecular solvents.The observed superior performance of IL-proline relative to Peg-proline or free proline, in terms of yields and enantiomeric excess, evidenced that the ionic moiety in IL-proline plays more than a silent or simply supporting role in the reaction (Scheme 4.4). ... [Pg.163]

Lewis adds 458 iodoarene 539 iodolactonization 277 5-iodonitroalkenes 1107 ion-pair immobilization 528 ion pairing 852 ion-tagged prolines 762 ionic fragments 526... [Pg.1414]

See other pages where Prolines ion-tagged is mentioned: [Pg.42]    [Pg.762]    [Pg.762]    [Pg.775]    [Pg.42]    [Pg.762]    [Pg.762]    [Pg.775]    [Pg.286]    [Pg.775]    [Pg.171]    [Pg.43]    [Pg.265]    [Pg.243]    [Pg.560]    [Pg.9]    [Pg.737]    [Pg.237]    [Pg.254]    [Pg.256]   
See also in sourсe #XX -- [ Pg.762 ]



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