π–π Stacking versus Steric Effects in Stereoselectivity Control: Highly Diastereoselective Synthesis ofsyn-1,2-Diarylpropylamines
作者:José L. García Ruano、José Alemán、Inés Alonso、Alejandro Parra、Vanesa Marcos、José Aguirre
DOI:10.1002/chem.200601893
日期:2007.7.16
2-diarylpropylamine derivatives. The sulfinyl group completely controls the configuration at C2 in the reactions of (S)-2. The configuration at C1 depends on the electron density of the ring adjacent to the iminic carbon atom which is modulated by pi-pi stacking interactions with the ring joined to the carbanionic centre. The stereoselectivity was controlled by modifying the acceptor character of the arylideneamine
N-芳基亚烷基胺与衍生自2-(对甲苯基亚磺酰基)甲苯(S)-1和(S)-2的亚磺酰基苄基碳负离子反应,在C1处提供1,2-二芳基乙基-和1,2-二芳基丙胺衍生物的差向异构混合物。亚磺酰基完全控制(S)-2反应中C2处的构型。C1处的构型取决于与亚氨基碳原子相邻的环的电子密度,该电子密度通过与环连接至碳负离子中心的pi-pi堆积相互作用进行调节。通过用适当的取代基修饰亚芳基胺环的受体特性来控制立体选择性,通过给电子基团可以在C1上形成高选择性(R)构型。N-(2,4,