Arylation of <i>gem</i>-difluoroalkenes using a Pd/Cu Co-catalytic system that avoids β-fluoride elimination
作者:Kedong Yuan、Taisiia Feoktistova、Paul Ha-Yeon Cheong、Ryan A. Altman
DOI:10.1039/d0sc05192f
日期:——
arylation reaction of gem-difluoroalkenes using arylsulfonyl chlorides to deliver α,α-difluorobenzyl products. The reaction proceeds through a β,β-difluoroalkyl–Pd intermediate that typically undergoes unimolecular β-F elimination to deliver monofluorinated alkene products in a net C–F functionalization reaction. However to avoid β-F elimination, we offer the β,β-difluoroalkyl–Pd intermediate an alternate
Pd II /Cu I共催化gem的芳基化反应-二氟烯烃使用芳基磺酰氯来提供 α,α-二氟苄基产品。该反应通过 β,β-二氟烷基-Pd 中间体进行,该中间体通常经历单分子 β-F 消除,以在净 C-F 官能化反应中提供单氟化烯烃产物。然而,为了避免 β-F 消除,我们为 β,β-二氟烷基-Pd 中间体提供了一种替代低能途径,涉及 β-H 消除,最终以净芳基化/异构化序列提供二氟化产物。总体而言,该反应能够探索不稳定的氟化烷基金属物质的新反应性,同时也为将现成的氟化烯烃转化为更精细的亚结构提供了新的机会。