Hypervalent‐iodine‐mediated oxidative coupling of the two aryl groups in either 2‐acylamino‐N‐phenyl‐benzamides or 2‐hydroxy‐N‐phenylbenzamides, with concomitant insertion of the ortho‐substituted N or O atom into the tether, has been described for the first time. This unusual metal‐free rearrangement reaction involves an oxidative C(sp2)C(sp2) aryl–aryl bond formation, cleavage of a C(sp2)C(O) bond
Formal Aniline Synthesis from Phenols through Deoxygenative N‐Centered Radical Substitution
作者:Samuel W. Lardy、Kristine C. Luong、Valerie A. Schmidt
DOI:10.1002/chem.201904288
日期:2019.12.2
lignin-derived substrates have emerged as desirable biorenewable chemical feedstocks for coupling reactions. A radical-mediated conversion of phenol derivatives to anilines is reported, using unfunctionalized hydroxamic acids as the N-centered radical source. The applicability of this triethylphosphitemediated O-atom transfer approach, which tolerates a range of steric and electronic demands to naturally
Aryl-Aryl Coupling Reaction Using a Novel and Highly Active Palladium Reagent Prepared from Pd(OAc)2, 1,3-Bis[diphenylphosphino]propane (DPPP), and Bu3P.
A palladium-assisted coupling reaction of aryl triflate with arene was investigated, and a novel Pd reagent prepared from equimolar Pd(OAc)2, 1,3-Bis[diphenylphosphino]propane (DPPP), and Bu3P was developed. This method is useful for intramolecular biaryl coupling reactions, not only between aryl triflate and arene (triflate-amide), but also between aryl halide and arene (halo-amide).