Chiral sulfoxide ligands bearing nitrogen atoms as stereocontrollable coordinating elements in palladium-catalyzed asymmetric allylic alkylations
作者:Kunio Hiroi、Yoshio Suzuki、Ikuko Abe、Yutaka Hasegawa、Kenji Suzuki
DOI:10.1016/s0957-4166(98)00394-2
日期:1998.11
chiral ligands in the palladium-catalyzed asymmetric allylic alkylations provided the highest enantioselectivity (50 or 58% e.e., respectively) among chiral sulfoxide ligands examined by us. The participation of the sulfinyl groups in these catalytic asymmetric reactions is rationalized, and the mechanism for the asymmetric induction is proposed on the basis of the stereochemical outcome obtained.
通过使用带有氮原子的手性亚砜配体作为配位元素,例如手性α-亚磺酰基乙酰胺,β或γ-氨基亚砜和β-亚磺酰基磺酰胺,研究了钯催化的不对称烯丙基烷基化反应。证明了手性亚磺酰基功能对不对称诱导的影响。(S)-2-吡咯烷基苯基对甲苯基亚砜或(S)-2-(N-丁基-N-甲基氨基甲基)苯基对亚砜的用途甲苯催化的不对称烯丙基烷基化反应中的甲苯基亚砜作为手性配体,在我们研究的手性亚砜配体中提供了最高的对映选择性(分别为50%或58%ee)。亚砜基参与这些催化的不对称反应是合理的,并基于获得的立体化学结果提出了不对称诱导的机理。