Steric evaluation of Pyox ligands for asymmetric intermolecular Heck-Matsuda reaction
作者:Rifhat Bibi、Ismat Ullah Khan、Abbas Hassan
DOI:10.1016/j.tetlet.2022.154204
日期:2022.11
increasing the steric of the ligands from phenyl substituent to mesityl on the pyridine ring of Pyox and isopropyl to tert-butyl group on the oxazoline ring. The ligand 6MesPyoxsBu bearing a sterically demanding mesityl group at position 6 of the pyridine ring showed optimum catalytic activity for Heck-Matsuda desymmetrization reaction of non-activated cyclopentene using Pd(tfa)2 as the catalyst. A
The factors affecting the palladium-catalyzed synthesis of chiral α-chloromethylene-γ-butyrolactone were investigated. The combined effect of ligand, additive and N-Chlorophthalimide (NCP) is an important factor for the yield and ee value of this reaction. The method has good generalizability.
Chiral CNN Pincer Palladium(II) Complexes with 2-Aryl-6-(oxazolinyl)pyridine Ligands: Synthesis, Characterization, and Application to Enantioselective Allylation of Isatins and Suzuki–Miyaura Coupling Reaction
作者:Tao Wang、Xin-Qi Hao、Juan-Juan Huang、Kai Wang、Jun-Fang Gong、Mao-Ping Song
DOI:10.1021/om400945d
日期:2014.1.13
1-naphthyl) ligands 2a–f were conveniently prepared from commercially available 6-bromo-2-picolinaldehyde in two steps. Reaction of 2a–f with PdCl2 in toluene in the presence of sodium bicarbonate afforded the corresponding CNNpincer Pd(II) complexes 3a–f via aryl C–H bond activation of the related ligands. All of the new compounds have been fully characterized by elemental analysis (MS for ligands), 1H