Radical Arylation of Triphenyl Phosphite Catalyzed by Salicylic Acid: Mechanistic Investigations and Synthetic Applications
作者:Manel Estruch-Blasco、Diego Felipe-Blanco、Irene Bosque、Jose C. Gonzalez-Gomez
DOI:10.1021/acs.joc.0c00795
日期:2020.11.20
arylphosphonates at 20 °C within 1–2 h is reported using inexpensive SA as the catalytic promoter of the reaction. Mechanistic investigations suggest that the reaction proceeds via radical–radical coupling, consistent with the so-called persistent radical effect. The reaction tolerated a wide range of functional groups and heteroaromatic moieties. The synthetic usefulness and the unique reactivity of the
In our current work, we have reported the first cobalt-catalyzed cross-coupling of arylboronic acid with alkyl/aryl phosphites under mild conditions. The reaction was carried out in the presence of zinc powder as an additive and ter-pyridine as a ligand. The use of non-precious cobalt salt makes the protocol advantageous, as it is inexpensive and more abundant than the previously used methods where
A visible‐light‐inducedmetal‐free catalytic system was developed for the synthesis of arylphosphonates starting from arylhydrazines and trialkylphosphites. By using the inexpensive eosin B as catalyst, sub‐stoichiometric amounts of DABCO, and ambient air as oxidant, diverse arylphosphonates were obtained under visible‐light irradiation. Notably, this catalytic system is suitable for gram‐scale reaction
Tf<sub>2</sub>O/DMSO-mediated dual activation of aryl phosphinate to access various aryl phosphonates
作者:Hui-Qi Yue、Da-Wei Shi、Ming Li、Si-Qi Gao、Mu-Xin Sun、Shun Zhang、Shang-Dong Yang、Bin Yang
DOI:10.1039/d3cc03250g
日期:——
A metal-free method for the dual activation of aryl phosphinate has been developed; the P–H and P–O bonds are sequentially activated by the Tf2O/DMSO system. Without the requirement of metals and unstable P-reagents, this one-pot procedure provides a convenient and practical access to a variety of aryl phosphonates. A mechanism involving twice generation of electrophilic P-species and two SN-processes