Ligand-Controlled Copper-Catalyzed Highly Regioselective Difluoromethylation of Allylic Chlorides/Bromides and Propargyl Bromides
作者:Yang Gu、Changhui Lu、Yucheng Gu、Qilong Shen
DOI:10.1002/cjoc.201700594
日期:2018.1
Highly regiodivergent copper‐catalyzed allylic/propargylic difluoromethylation reactions by employing different ligands are described. When 5,6‐dimethyl‐1,10‐phenanthroline was used as the ligand, exclusively α‐difluoromethylated products were obtained, while γ‐selective difluoromethylated products were generated when N‐heterocyclic carbene‐SIPr was used as the ligand. Likewise, high α‐ vs. γ‐selectivities
描述了通过使用不同的配体的高度区域发散的铜催化的烯丙基/炔丙基二氟甲基化反应。当5,6-二甲基-1,10-菲咯啉用作配体时,仅获得α-二氟甲基化产物,而当N-杂环卡宾-SIPr用作配体时会生成γ-选择性二氟甲基化产物。同样,在类似的铜催化剂存在下,炔丙基溴的反应也获得了高的α-与γ-选择性。此外,通过使用手性配体,开发了具有中等到良好对映选择性的铜催化不对称烯丙基二氟甲基化反应。