A novel PIFA‐mediated cross‐dehydrogenativecoupling (CDC) reaction of N‐heteroarenes with cyclic ethers has been reported. The reaction utilizes simple and cheap ethanol as the promoter in the presence of visible light, which is mild and efficient and allows the facile transformation of a variety of complex and highly functionalized cyclic ethers into medicinally valuable Cα‐heteroarylated cyclic
Selective C(sp<sup>3</sup>)–H activation of simple alkanes: visible light-induced metal-free synthesis of phenanthridines with H<sub>2</sub>O<sub>2</sub> as a sustainable oxidant
A visible light-induced metal-free C(sp3)–H phenanthridinylation of simple alkanes with isonitrile is developed with H2O2 as a terminal sustainable oxidant.
Metal–Organic Layers for Synergistic Lewis Acid and Photoredox Catalysis
作者:Yangjian Quan、Guangxu Lan、Yingjie Fan、Wenjie Shi、Eric You、Wenbin Lin
DOI:10.1021/jacs.9b12593
日期:2020.1.29
Metyrapone. The superior catalytic performance of Hf12-Ir-OTf over a mixture of photoredox catalyst and stoichiometric amounts of Brønstedacids or sub-stoichiometric amounts (20 mol%) of Lewis acids is attributed to the close proximity (1.2 nm) between photoredox and Lewis acid catalysts in Hf12-Ir-OTf, which not only facilitates the reaction between the carbon radical and the activated heteroarene but
A radical addition/cyclization of diverse ethers to 2-isocyanobiaryls under mildly basic aqueous conditions
作者:Cintia Anton-Torrecillas、Diego Felipe-Blanco、Jose C. Gonzalez-Gomez
DOI:10.1039/c6ob02103d
日期:——
Mildly basic aqueous conditions facilitated the tert-butyl peroxybenzoate (TBPB) mediated dehydrogenative addition of a range of ethers, including acetals, to diverse substituted 2-isocyanobiaryls. Mechanistic studies suggest that this radical cascade is an example of base promoted homolytic aromatic substitution (BHAS).
Tandem dual C(sp3)-H/C(sp2)-H functionalization: a radical cyclization of 2-isocyanobiphenyl with ether to 6-alkylated phenanthridine
作者:ChangDuo Pan、Jie Han、Zhu ChengJian
DOI:10.1007/s11426-014-5118-7
日期:2014.8
A simple and efficient radical coupling of 2-isocyanobiphenyl with ethers was developed, providing a variety of 6-alkylated phenanthridines. Both cyclic and acyclic ethers are suitable substrates for this transformation, which comprised the functionalization of two C-H bonds: the sp3 C-H of ether and sp2 C-H of phenyl group. The kinetic isotope effect (KIE) revealed that the cleavage of sp3 C-H bond would be involved in the rate-determining step.