Asymmetric catalysis with a chiral (Salen)Mn(III) complex is applied successfully to highly enantioselective intramolecular haloamination reactions of alkenes through a chiral aziridinium ion ring-opening sequence. Computational and experimental studies suggested that the C5–C6 bond polarization has a major effect on the regioselectivity of the chiral aziridines ring intermediate, and steric hindrance
手性 (Salen)Mn(III) 配合物的不对称催化通过手性
氮丙啶离子开环序列成功应用于烯烃的高对映选择性分子内卤化反应。计算和实验研究表明,C5-C6 键极化对手性
氮丙啶环中间体的区域选择性有主要影响,C5 或 C6 基团的空间位阻起次要作用。多种
氨基烯烃在该反应条件下可以环化得到2-
溴代/
氯代
吡咯烷和二氢
吲哚衍
生物,具有优异的收率和对映选择性。