Palladium-Catalyzed Enantioselective Domino Heck/Intermolecular C–H Bond Functionalization: Development and Application to the Synthesis of (+)-Esermethole
作者:Wangqing Kong、Qian Wang、Jieping Zhu
DOI:10.1021/jacs.5b11625
日期:2015.12.30
Intramolecular asymmetric carbopalladation of N-aryl acrylamides followed by intermolecular trapping of the resulting σ-C(sp(3))-Pd complex by azoles afforded 3,3-disubstituted oxindoles in good yields with excellent enantioselectivities. Two C-C bonds were created with concurrent formation of an all-carbon quaternary stereocenter. Oxadiazole substituted oxindoles were subsequently converted to pyrroloindolines
N-芳基丙烯酰胺的分子内不对称碳钯化,然后用唑类分子间捕获所得的 σ-C(sp(3))-Pd 复合物,以良好的收率和出色的对映选择性提供了 3,3-二取代的羟吲哚。创建了两个 CC 键,同时形成了一个全碳四元立体中心。恶二唑取代的羟吲哚随后通过前所未有的还原环化方案转化为吡咯并二氢吲哚。(+)-esermethole 的对映选择性合成说明了这种化学的效用。