(S)-Proline-derived new chiral ligands with phosphino, organosulfur or organoselenenyl functionality as an enantiocontrollable coordinating element
作者:Kunio Hiroi、Yoshio Suzuki、Ikuko Abe
DOI:10.1016/s0957-4166(99)00105-6
日期:1999.3
The synthesis of (S)-proline-derived chiral ligands bearing phosphino, organosulfur or selenenyl groups and their use as chiral ligands in palladium-catalyzed asymmetric allylic alkylations has been accomplished. In particular, the (S)-proline-derived phosphine ligands bearing alkylsulfenyl groups provided high enantioselectivity, and the degree of asymmetric induction was dependent upon the steric
带有膦,有机硫或亚硒基的(S)-脯氨酸衍生的手性配体的合成及其在钯催化的不对称烯丙基烷基化反应中作为手性配体的应用已经完成。特别地,带有烷基亚磺酰基的(S)-脯氨酸衍生的膦配体提供了高对映选择性,并且不对称诱导的程度取决于亚磺酰基中烷基取代基的空间体积。立体化学结果是通过一种合理的机制来合理化的,该机制包括由所涉及的两个优选杂原子的参与而形成的螯合物的协助。