Peroxide-Free Co(OAc)2-Catalyzed Radical Addition of sp3 C–H Bonds to Alkynes
作者:Wanzhi Chen、Min Zhang、Yun Zhao
DOI:10.1055/s-0036-1588909
日期:——
Abstract Cobalt-catalyzed radical addition of C–Hbondsadjacent to an oxygenatom towards alkynes is described. The reaction proceeded at 60 °C without using additional radical initiators, and leads to 2-vinyl ether derivatives in good yields. Cobalt-catalyzed radical addition of C–Hbondsadjacent to an oxygenatom towards alkynes is described. The reaction proceeded at 60 °C without using additional
Photoinduced stereoselective hydroalkylation of terminal arylalkynes via C(sp3)-H functionalization
作者:Fen Liu、Kun Zhang、Xiao-Fei Zhao、Qing-Xin Meng、Tian-Sheng Zhao、Wan-Fa Tian、Yong-Qin He
DOI:10.1016/j.tetlet.2022.154321
日期:2023.1
A photoinduced stereoselective hydroalkylation of terminal arylalkynes via C(sp3)-Hactivation was developed. This method employed an organic dye 2,4,5,6-tetrakis(carbazol-9-yl)-1,3‑dicyanobenzene (4CzIPN) as photosensitizer and N-hydroxyphthalimide (NHPI) as the HAT catalyst, which totally inhibited the usage of transition metals and stoichimetrical oxidant or radical initiators (e.g. TBHP). The method
A unified strategy for the synthesis of 2-vinyl heterocycles is reported. With visible light irradiation, simple and cheap CuCl is able to functionalize a terminal alkyne, giving Cu(I)-acetylide in situ. Unlike the case of noble metals or organic dye photocatalysts, this critical Cu(I)-acetylide not only activates the C-H bond of terminal alkynes but also serves as a photocatalyst to achieve varieties of 2-vinyl heterocycles in good to excellent yields, even for large scale and late-stage functionalization of natural product.