Abstract
Abstract
In this paper, the reaction of chiral Rh-AMPP catalysts for the asymmetric hydrogenation of ketopantoyl lactone to D-(-)pantolactone under a polyether guanidinium salt ionic liquid ([Me(EO)16TMG][OMs])/toluene homogeneous catalytic system was investigated. The impact of polyether ionic liquid doping on the catalytic activity and enantioselectivity was investigated. To separate and recycle chiral Rh-AMPP catalysts, a “homogeneous catalytic-liquid/solid separation” system on the basis of [Me(EO)16TMG][OMs] was constructed. The catalytic system exhibited high catalytic activity, enantioselectivity, and long-term stability, and no obvious reduction in enantioselectivity was found after four cycles.