Asymmetric transfer hydrogenation catalysed by hydrophobic dendritic DACH–rhodium complex in water
作者:Lin Jiang、Tong-Fei Wu、Ying-Chun Chen、Jin Zhu、Jin-Gen Deng
DOI:10.1039/b608386b
日期:——
Hydrophobic Frechet-type dendritic chiral 1,2-diaminocyclohexane-Rh(III) complexes have been applied in the asymmetric transfer hydrogenation of ketones in water using HCOONa as hydrogen source. The catalysts were found to be finely dissolved in the liquid substrates in the aqueous mixture and exhibited high catalytic activity and enantioselectivity (52-97% ee). The catalytic loading could be decreased
疏水性Frechet型树枝状手性1,2-二氨基环己烷-Rh(III)配合物已被用于使用HCOONa作为氢源的水中酮的不对称转移加氢。发现催化剂被精细地溶解在水性混合物中的液体底物中,并表现出高催化活性和对映选择性(52-97%ee)。可以将催化负载降低至0.01mol%,并且仍然以良好的对映选择性获得良好的转化率。此外,通过添加己烷可以容易地从混合物中沉淀出催化剂,并且可以重复使用几次而不会影响高对映选择性。