Enantioselective Synthesis of Axially Chiral Biaryls by Diels–Alder/Retro-Diels–Alder Reaction of 2-Pyrones with Alkynes
作者:Meng-Meng Xu、Xin-Yu You、Yu-Zhen Zhang、Yang Lu、Kui Tan、Limin Yang、Quan Cai
DOI:10.1021/jacs.1c04759
日期:2021.6.23
The enantioselective synthesis of axiallychiralbiaryls by a copper-catalyzed Diels–Alder/retro-Diels–Alder reaction of 2-pyrones with alkynes is reported herein. Using electron-deficient 2-pyrones and electron-rich 1-naphthyl acetylenes as the reaction partners, a broad range of axiallychiralbiaryl esters are obtained in excellent yields (up to 97% yield) and enantioselectivities (up to >99% ee)
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
We report herein the first examples of a palladium-catalyzed enantioselective Cacchi reaction for the synthesis of indoles bearing a chiral C2-aryl axis. In the presence of a catalytic amount of Pd(OAc)2 and (R,R)-QuinoxP* ligand, reaction of N-aryl(alkyl)sulfonyl-2-alkynylanilides with arylboronic acids under oxygen atmosphere afforded enantioenriched 2,3-disubstituted indoles in high yields and enantioselectivity
nyltetrahydro-1H-imidazo[1,5-a]indol-1-one, bearing PPh2, P(t-Bu)2, and P(c-Hex)2 groups were designed and prepared with a view toward using them in aqueous heterogeneous asymmetric Suzuki–Miyaura biaryl coupling. The asymmetric coupling of 2-substituted 1-iodonaphthalenes and 2-substituted naphthalen-1-ylboronic acid took place in water under heterogeneous conditions in the presence of 10 mol% palladium