Palladium-Catalyzed Intermolecular Asymmetric Dearomative Annulation of Phenols with Vinyl Cyclopropanes
作者:Wen-Dao Chu、Tian-Tian Liang、Hao Ni、Zhi-Hong Dong、Zhihui Shao、Yong Liu、Cheng-Yu He、Ruopeng Bai、Quan-Zhong Liu
DOI:10.1021/acs.orglett.2c01594
日期:2022.7.15
Herein, we report the Pd(0)-catalyzed intermolecularasymmetric dearomative [3 + 2] annulation of phenols with vinyl cyclopropanes via in situ generated ortho-quinone methide intermediates. A series of highly functionalized spiro-[5,6] bicycles which bear three contiguous stereogenic centers including one all-carbon quaternary were obtained with excellent stereoselectivities. Density functional theory
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
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.