作者:Zhe Zhuang、Chang-Bin Yu、Gang Chen、Qing-Feng Wu、Yi Hsiao、Candice L. Joe、Jennifer X. Qiao、Michael A. Poss、Jin-Quan Yu
DOI:10.1021/jacs.8b06527
日期:2018.8.15
An acetyl-protected aminoethyl phenyl thioether has been developed to promote C(sp3)-H activation. Significant ligand enhancement is demonstrated by the realization of the first Pd(II)-catalyzed olefination of C(sp3)-H bonds of free carboxylic acids without using an auxiliary. Subsequent lactonization of the olefinated product via 1,4 addition provided exclusively monoselectivity in the presence of
已开发出乙酰基保护的氨基乙基苯基硫醚来促进 C(sp3)-H 活化。在不使用助剂的情况下,首次实现了 Pd(II) 催化的游离羧酸 C(sp3)-H 键的烯化反应,证明了配体的显着增强。随后通过 1,4 加成对烯化产物进行内酯化,在多个 β-CH 键存在下仅提供单选择性。产品γ-内酯可以很容易地打开,得到高价值的β-烯化或γ-羟基化脂肪酸。考虑到使用卤代烷开发 Heck 偶联的挑战,该反应提供了一种有用的替代方案。