Cobalt-Catalyzed Asymmetric Cyclopropanation with Diazosulfones: Rigidification and Polarization of Ligand Chiral Environment via Hydrogen Bonding and Cyclization
作者:Shifa Zhu、Joshua V. Ruppel、Hongjian Lu、Lukasz Wojtas、X. Peter Zhang
DOI:10.1021/ja7106838
日期:2008.4.1
A new D2-symmetric chiral porphyrin P6 (2,6-DiMeO-ZhuPhyrin) with enhanced chiral rigidity and polarity was designed and synthesized through incorporation of hydrogen bonding and cyclic structure. Its cobalt(II) complex [Co(P6)] is a highly active and selective catalyst for asymmetric cyclopropanation of alkenes with diazosulfones. The [Co(P6)]-based catalytic system is suitable for various aromatic
通过引入氢键和环状结构,设计并合成了一种具有增强手性刚性和极性的新型 D2 对称手性卟啉 P6(2,6-DiMeO-ZhuPhyrin)。其钴 (II) 配合物 [Co(P6)] 是一种高活性和选择性的催化剂,用于烯烃与重氮砜的不对称环丙烷化反应。[Co(P6)]基催化体系适用于各种芳族烯烃以及缺电子烯烃,包括α、β-不饱和酯、酮和腈,在温和的条件下以高产率和高选择性。在大多数情况下,都实现了出色的非对映选择性和对映选择性。