Low-Temperature Heck Reactions of Axially Chiral <i>o</i>-Iodoacrylanilides Occur with Chirality Transfer: Implications for Catalytic Asymmetric Heck Reactions
作者:Andre J. B. Lapierre、Steven J. Geib、Dennis P. Curran
DOI:10.1021/ja067790i
日期:2007.1.1
Low-temperature Heck reactions of chiral o-iodoacrylanilides with achiral palladium catalysts occur with efficient transfer of chirality from the chiral axis of the precursor to the new stereocenter of the product. The results suggest that the primary stereocontrolling step in asymmetric Heck reactions is a dynamic kinetic resolution (oxidative addition to the C−I) bond and not a face selective reaction (complexation
手性邻碘丙烯酰苯胺与非手性钯催化剂的低温 Heck 反应发生,手性从前体的手性轴有效转移到产品的新立体中心。结果表明,不对称 Heck 反应中的主要立体控制步骤是动态动力学拆分(氧化加成到 C-I)键,而不是面选择性反应(与烯烃络合或插入)。