Palladium‐Catalyzed Chemoselective Borylation of (Poly)halogenated Aryl Triflates and Their Application in Consecutive Reactions
作者:Shan Shan Ng、Zicong Chen、On Ying Yuen、Chau Ming So
DOI:10.1002/adsc.202101501
日期:2022.4.26
This study reports the palladium-catalyzed chemoselective borylation of (poly)halogenated aryl triflates with a reactivity order of C−Cl>C−OTf. A catalyst system comprising Pd(OAc)2 and SelectPhos (L1) enables a reaction with high reactivity and chemoselectivity. The consecutively chemoselective borylation reaction followed by the chemoselective intermolecular Suzuki-Miyaura reaction can be performed
Palladium-catalyzed chemoselective direct α-arylation of carbonyl compounds with chloroaryl triflates at the C–Cl site
作者:Zicong Chen、Changxue Gu、On Ying Yuen、Chau Ming So
DOI:10.1039/d1sc06701j
日期:——
study described palladium-catalyzed chemoselective direct α-arylation of carbonyl compounds with chloroaryl triflates in the Ar–Cl bond. The Pd/SelectPhos system showed excellent chemoselectivity toward the Ar–Cl bond in the presence of the Ar–OTf bond with a broad substrate scope and excellent product yields. The electronic and steric hindrance offered by the –PR2 group of the ligand with the C2-alkyl
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