Samarium diiodide-promoted electrophilic amination of ketone enolates: efficient synthesis of quaternary carbon-containing α-aminated ketones
摘要:
An efficient and practical electrophilic amination method that allows the preparation of useful quaternary carbon-containing alpha-aminoketones was developed. The reaction proceeds regiospecifically via a samarium enolate intermediate at room temperature in the presence of mild reducing agent SmI2. Unlike the most reported lithium enolate cases, this new amination method does not require the use of strong base such as BuLi or LDA. (C) 2008 Elsevier Ltd. All rights reserved.
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 chiralphosphoricacid, 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