Triflate‐Selective Suzuki Cross‐Coupling of Chloro‐ and Bromoaryl Triflates Under Ligand‐Free Conditions
作者:Grace M. Ibsen、Vitor H. Menezes da Silva、J. Cole Pettigrew、Sharon R. Neufeldt
DOI:10.1002/asia.202300036
日期:——
“Ligand-free” room-temperature conditions for Pd-catalyzed Suzuki couplings of haloaryl triflates give selectivity for triflate over chloride or bromide. For chloroaryl triflates, triflate selectivity is exclusive and represents an improvement over conditions with strong ancillary ligands. The triflate selectivity with bromoaryl triflates is unprecedented for Suzuki couplings. Solvent choice is critical
卤代芳基三氟甲磺酸酯的 Pd 催化铃木偶联的“无配体”室温条件使三氟甲磺酸酯优于氯化物或溴化物的选择性。对于氯芳基三氟甲磺酸酯,三氟甲磺酸酯的选择性是唯一的,代表了对强辅助配体条件的改进。溴芳基三氟甲磺酸酯的三氟甲磺酸酯选择性对于 Suzuki 偶联来说是前所未有的。溶剂的选择很关键。三氟甲磺酸选择性氧化加成可能发生在阴离子 [Pd(solvent)(X)] -处。