(S)-Phenylalanine-derived chiral phosphorus–olefin ligands in rhodium-catalyzed asymmetric 1,4-addition reactions
作者:Rintaro Narui、Sayuri Hayashi、Haruka Otomo、Ryo Shintani、Tamio Hayashi
DOI:10.1016/j.tetasy.2012.02.007
日期:2012.2
all cases; the rhodium complexes coordinated with these ligands have been employed as catalysts for the asymmetric 1,4-addition of arylboronic acids to α,β-unsaturated ketones, to give 1,4-adducts with high enantioselectivities for cyclic enones and moderate enantioselectivities for acyclic enones.
已经设计并合成了手性
磷-
烯烃(S)-1,(S)-4和(S)-5。这些
配体都是由(S)-
苯丙
氨酸衍
生物合成的,并充当
铑的
磷-
烯烃双齿
配体。在所有情况下,都可以通过(S)-
苯丙
氨酸的原始手性有效地控制
烯烃的配位面。与这些
配体配位的
铑配合物已被用作
催化剂,用于芳基
硼酸不对称地与α,β-不饱和
酮进行1,4-加成反应,从而得到对环
酮具有高对映选择性的1,4-加合物,对无环
烯酮具有中等的对映选择性。