Triflate‐Selective Suzuki Cross‐Coupling of Chloro‐and Bromoaryl Triflates Under Ligand‐Free Conditions

GM Ibsen, VH Menezes da Silva… - Chemistry–An Asian …, 2023 - Wiley Online Library
GM Ibsen, VH Menezes da Silva, JC Pettigrew, SR Neufeldt
Chemistry–An Asian Journal, 2023Wiley Online Library
In the absence of strong ancillary ligands such as phosphines or N‐heterocyclic carbenes,
palladium salts are selective for C− OTf cleavage in the room‐temperature Suzuki couplings
of chloroaryl triflates in acetonitrile. Similar “ligand‐free” conditions in DMSO also promote
triflate‐selective Suzuki coupling of bromoaryl triflates. This triflate selectivity complements
the typical preference for reaction of bromides in prior reports of Suzuki couplings using
phosphine ligands. DFT calculations and additional experimental evidence are consistent …
Abstract
In the absence of strong ancillary ligands such as phosphines or N‐heterocyclic carbenes, palladium salts are selective for C−OTf cleavage in the room‐temperature Suzuki couplings of chloroaryl triflates in acetonitrile. Similar “ligand‐free” conditions in DMSO also promote triflate‐selective Suzuki coupling of bromoaryl triflates. This triflate selectivity complements the typical preference for reaction of bromides in prior reports of Suzuki couplings using phosphine ligands. DFT calculations and additional experimental evidence are consistent with triflate‐selective oxidative addition taking place at homogeneous, possibly mononuclear, anionic palladium supported by a solvent molecule.
Wiley Online Library
以上显示的是最相近的搜索结果。 查看全部搜索结果