Palladium-catalyzed allylic alkylation using chiral P,O-ligands synthesized via sulfonamide directed ortho-lithiation
作者:Zhanina Petkova、Malinka Stoyanova、Vladimir Dimitrov
DOI:10.1016/j.tetlet.2014.02.040
日期:2014.3
moieties is designed. The introduction of the chirality is achieved through different stereogenic groups attached to the sulfonamide nitrogen. The highly effective sulfonamide directed ortho-lithiation and the subsequent reaction with ClPPh2 is the key step in the synthesis of the ligands. The prepared P,O-compounds are applied in Pd-catalyzed asymmetric allylic alkylation (AAA) under optimized conditions
设计了一种合成磺酰胺和膦部分的手性P,O-配体的有效方法。手性的引入是通过连接到磺酰胺氮上的不同立体异构基团实现的。高效磺酰胺指导的邻位锂化以及随后与ClPPh 2的反应是合成配体的关键步骤。在优化条件下,将制备的P,O化合物应用于Pd催化的不对称烯丙基烷基化反应(AAA)中,以获得高度的对映选择性。