Pd<sup>II</sup>-Catalyzed γ-C(sp<sup>3</sup>)–H (Hetero)arylation of Ketones Enabled by Transient Directing Groups
作者:Yi-Hao Li、Yuxin Ouyang、Nikita Chekshin、Jin-Quan Yu
DOI:10.1021/acscatal.2c03400
日期:2022.9.2
Pd(II)-catalyzed γ-C(sp3)–H (hetero)arylation of aliphatic ketones is developed using α-amino acids as transient directing groups (TDG). A variety of aliphatic ketones were (hetero)arylated at the γ-position via a 5,6-membered fused cyclopalladation intermediate to afford the remotely arylated products in up to 88% yield. The crucial ligand effect of 2-pyridone is further enhanced by reducing the loading
使用 α-氨基酸作为瞬时导向基团 (TDG) 开发了 Pd(II) 催化的脂肪族酮的γ-C(sp 3 )–H(杂)芳基化。多种脂肪酮通过 5,6 元稠合环钯化中间体在 γ 位进行(杂)芳基化,得到远程芳基化产物,产率高达 88%。通过减少酸添加剂的负载量,2-吡啶酮的关键配体效应得到进一步增强。因此,该催化体系反应活性的提高也使得酮的环状γ-亚甲基C(sp 3 )–H芳基化成为可能。醛的 γ-C-H 芳基化的机理研究和比较揭示了设计位点选择性 TDG 的结构见解。