Copper-Catalyzed Propargylic Substitution of Dichloro Substrates: Enantioselective Synthesis of Trisubstituted Allenes and Formation of Propargylic Quaternary Stereogenic Centers
作者:Hailing Li、David Grassi、Laure Guénée、Thomas Bürgi、Alexandre Alexakis
DOI:10.1002/chem.201404668
日期:2014.12.8
the desired 1,3‐substitution products. The enantioenriched chloroallenes could be further transformed into the corresponding trisubstituted allenes or terminal alkynes bearing all‐carbon quaternary stereogenic centers, through the copper‐catalyzed enantiospecific 1,1/1,3‐substitutions. The two successive copper‐catalyzed reactions could be eventually combined into a one‐pot procedure and different desired
提出了一种简单而通用的铜催化的炔丙基取代过程。使用容易制备的前手性二氯底物,易于获得的格利雅试剂以及催化量的铜盐和手性配体,我们获得了一系列合成上令人感兴趣的三取代氯代烯。底物范围和亲核试剂范围广泛,可为所需的1,3取代产物提供较高的对映选择性。通过铜催化的对映体特异性1,1 / 1,3取代基,可以将对映体富集的氯丙二烯进一步转化为带有全碳四元立体异构中心的相应三取代的丙二烯或末端炔。