From Bifunctional to Trifunctional (Tricomponent Nucleophile–Transition Metal–Lewis Acid) Catalysis: The Catalytic, Enantioselective α-Fluorination of Acid Chlorides
作者:Jeremy Erb、Daniel H. Paull、Travis Dudding、Lee Belding、Thomas Lectka
DOI:10.1021/ja2014345
日期:2011.5.18
fluorination of a ketene enolate intermediate. We discovered, for the first time, that a third catalyst, a Lewis acidic lithium salt, could be introduced into a dually activated system to amplify yields of aliphatic products, primarily through activation of the fluorinating agent. Through our mechanistic studies (based on kinetic data, isotopic labeling, spectroscopic measurements, and theoretical calculations)
我们详细报告了我们对酰氯的催化不对称 α-氟化的研究,这是一种生产一系列 α-氟代羧酸衍生物的实用方法,其中通过烯酮烯醇中间体的亲电氟化来控制提高的产率和几乎完全的对映选择性. 我们第一次发现,可以将第三种催化剂路易斯酸性锂盐引入双重活化系统,主要通过氟化剂的活化来提高脂肪族产物的产量。通过我们的机理研究(基于动力学数据、同位素标记、光谱测量和理论计算),我们能够利用我们对这种“三功能”的理解