functionalizations of more distal C-H bonds in hydrocinnamoyl ketones, Weinreb amides, and biphenyl Weinreb amides. Mechanistically, the coordination of these carbonyl groups and the bisdentate amino acid ligand with Pd(II) centers provides further evidence for our early hypothesis that the carbonyl groups of the potassium carboxylate are responsible for the directed C-H activation of carboxylicacids.
Formal Enone α-Arylation via I(III)-Mediated Aryl Migration/Elimination
作者:Bruna S. Martins、Daniel Kaiser、Adriano Bauer、Irmgard Tiefenbrunner、Nuno Maulide
DOI:10.1021/acs.orglett.1c00251
日期:2021.3.19
A formal enone α-arylation is described. This metal-free transformation relies on the I(III)-mediated skeletal reorganization of silyl enol ethers and features mild conditions, good yields, and high stereoselectivities for β-substituted enones.
A Weinreb amide approach to the synthesis of trifluoromethylketones
作者:DiAndra M. Rudzinski、Christopher B. Kelly、Nicholas E. Leadbeater
DOI:10.1039/c2cc35037h
日期:——
A novel route to access trifluoromethylketones (TFMKs) from Weinreb amides is reported. This represents the first documented case of the Ruppert–Prakash reagent (TMS–CF3) reacting in a constructive manner with an amide and enables synthesis of TMFKs without risk of over-trifluoromethylation.
Light‐Driven Enantioselective Synthesis of Pyrroline Derivatives by a Radical/Polar Cascade Reaction
作者:Ricardo I. Rodríguez、Leonardo Mollari、José Alemán
DOI:10.1002/anie.202013020
日期:2021.2.23
functionalization of acyl heterocycles through a hydrogen‐atom transfer (HAT) process and the use of tailor‐made ketimines as reliable electrophilic partners. This transformation is translated into an enantiomerically controlled radical/polar cascade reaction in which water is produced as the sole by‐product and stereoselectivity is dictated by coordination to a chiral‐at‐rhodium catalyst.