Methylene C(sp<sup>3</sup>)–H β,β′-Diarylation of Cyclohexanecarbaldehydes Promoted by a Transient Directing Group and Pyridone Ligand
作者:Sahra St John-Campbell、Andrew J. P. White、James A. Bull
DOI:10.1021/acs.orglett.0c00124
日期:2020.3.6
A hindered β-amino amide transient directing group effects di-trans-arylation of cyclohexanecarbaldehydes. The amide N-substituents are shown to affect yield and can enhance the rate of arylation compared with the α-amino acid. Addition of a pyridone ligand further enhanced reactivity. The reaction is successful for a range of aryl iodides, and various substituted cyclohexane carboxaldehydes, providing
受阻的β-氨基酰胺瞬态导向基团可实现环己烷甲醛的双反芳基化作用。与α-氨基酸相比,酰胺N-取代基显示出影响收率并且可以提高芳基化速率。吡啶酮配体的添加进一步增强了反应性。对于一系列的芳基碘化物和各种取代的环己烷甲醛,该反应是成功的,可以从简单的原料中得到官能化的产物。提出了引起瞬态烯胺的机制。