Thioether-Directed NiH-Catalyzed Remote γ-C(sp<sup>3</sup>)–H Hydroamidation of Alkenes by 1,4,2-Dioxazol-5-ones
作者:Bingnan Du、Yuxin Ouyang、Qishu Chen、Wing-Yiu Yu
DOI:10.1021/jacs.1c05834
日期:2021.9.22
amidation of unactivated alkenes. Due to the preference for five-membered nickelacycle formation, the chain-walking isomerization initiated by the NiH insertion to an alkene can be terminated at the γ-methylene site remote from the alkene moiety. By employing 2,9-dibutyl-1,10-phenanthroline (L4) as the ligand and dioxazolones as the reagent, the amidation occurs at the γ-C(sp3)–H bonds to afford the amide
开发了一种 NiH 催化的硫醚导向的环金属化策略,以实现未活化烯烃的远程亚甲基 C-H 键酰胺化。由于优先形成五元镍环,由 NiH 插入烯烃引发的链式异构化可以在远离烯烃部分的 γ-亚甲基位点终止。通过使用 2,9-二丁基-1,10-菲咯啉 ( L4 ) 作为配体和二恶唑酮作为试剂,酰胺化发生在 γ-C(sp 3 )-H 键上,以提供高达 90% 的酰胺产物产量(> 40 个例子)具有显着的区域选择性(高达 24:1 rr)。