Direct Asymmetric Amination of α-Branched Cyclic Ketones Catalyzed by a Chiral Phosphoric Acid
作者:Xiaoyu Yang、F. Dean Toste
DOI:10.1021/jacs.5b00229
日期:2015.3.11
Here we report the direct asymmetric amination of α-substituted cyclic ketones catalyzed by a chiral phosphoric acid, yielding products with a N-containing quaternary stereocenter in high yields and excellent enantioselectivities. Kinetic resolution of the starting ketone was also found to occur on some of the substrates under milder conditions, providing enantioenriched α-branched ketones, another
在这里,我们报告了由手性磷酸催化的 α-取代环酮的直接不对称胺化,以高产率和优异的对映选择性产生具有含氮四元立体中心的产物。还发现在温和条件下在一些底物上发生起始酮的动力学拆分,提供对映体富集的 α-支化酮,这是有机合成中的另一个重要组成部分。这种方法的实用性在 (S)-氯胺酮的短合成中得到了证明,这是这种多功能药物的活性更高的对映异构体。