Modulating Reactivity and Diverting Selectivity in Palladium-Catalyzed Heteroaromatic Direct Arylation Through the Use of a Chloride Activating/Blocking Group
作者:Benoît Liégault、Ivan Petrov、Serge I. Gorelsky、Keith Fagnou
DOI:10.1021/jo902515z
日期:2010.2.19
Through the introduction of an aryl chloride substituent, the selectivity of palladium-catalyzed direct arylation may be diverted to provide alternative regioisomeric products in high yields. In cases where low reactivity is typically observed, the presence of the carbon−chlorine bond can serve to enhance reactivity and provide superior outcomes. From a strategic perspective, the C−Cl bond is easily
通过引入芳基氯取代基,可以改变钯催化的直接芳基化的选择性,从而以高收率提供替代的区域异构产物。在通常观察到低反应性的情况下,碳-氯键的存在可以起到增强反应性和提供优异结果的作用。从战略角度看,C-Cl键易于引入,可用于各种后续转化中,从而以最少的底物预活化提供大量高度官能化的杂环。还已经从力学上评估了C-Cl官能团对直接芳基化反应性的影响,并且观察到的反应性特征与协同的金属化-去质子化途径所预测的非常相关。