hydrogenation of α-halogenated ketones with iridium catalyst was developed, utilizing easily accessed cinchona-alkaloid-based NNP ligands. Various α-chloroacetophenones, heterocyclic thienyl and furanyl substrates, and even bromoketones were completely converted to the desired chiral halohydrins by this protocol. Both (R)- and (S)-chiral halohydrins can be prepared by changing the configurations of the chiral
利用易于获取的基于
金鸡纳
生物碱的 NNP
配体,开发了
铱催化剂对 α-卤化酮的不对称氢化。通过该协议,各种 α-
氯苯乙酮、杂环
噻吩基和
呋喃基底物,甚至
溴酮完全转化为所需的手性卤代醇。( R )- 和 ( S )- 手性卤代醇都可以通过改变手性
配体 NNP 的构型来制备,分别具有高达 99.6% ee(对映体过量)和 98.8% ee。此外,有效地进行了克级实验。