Visible-Light-Induced Nickel-Catalyzed Radical Cross-Couplings to Access α-Aryl-α-trifluoromethyl Alcohols
作者:Feng Chen、Xiu-Hua Xu、Lingling Chu、Feng-Ling Qing
DOI:10.1021/acs.orglett.2c03943
日期:2022.12.23
phthalimido trifluoroethanol with aryl bromides to furnish α-aryl-α-trifluoromethyl alcohols is reported. This reaction proceeds via a photoinduced charge transfer of an electron donor–acceptor complex between Hantzsch ester and phthalimido trifluoroethanol, followed by 1,2-hydrogen atom transfer, to generate the α-hydroxytrifluoroethyl radical for the cross-coupling of aryl bromides. No exogenous photocatalysts
报道了邻苯二甲酰亚氨基三氟乙醇与芳基溴的光化学诱导的镍催化自由基交叉偶联以提供 α-芳基-α-三氟甲基醇。该反应通过 Hantzsch 酯和邻苯二甲酰亚胺基三氟乙醇之间的电子供体-受体复合物的光诱导电荷转移进行,然后进行 1,2-氢原子转移,生成 α-羟基三氟乙基自由基,用于芳基溴的交叉偶联。这种温和且操作简单的协议不需要外源光催化剂或化学计量金属还原剂。观察到广泛的底物相容性和优异的官能团耐受性。