A novel chiral 1,5‐N,N‐bidentate ligand based on a spirocyclic pyrrolidine oxazoline backbone was designed and prepared, and it coordinates CuBr in situ to form an unprecedented catalyst that enables efficient oxidative cross‐coupling of 2‐naphthols. Air serves as an external oxidant and generates a series of C1‐symmetric chiral BINOL derivatives with high enantioselectivity (up to 99 % ee) and good
Multidentate phosphite ligands, catalytic compositions containing such ligands, and catalytic prosses utilizing such catalytic compositions
申请人:——
公开号:US20030023110A1
公开(公告)日:2003-01-30
Multidentate phosphite ligands are disclosed for use in reactions such as hydrocyanation and isomerization. The catalyst compositions made therefrom and the various catalytic processes which employ such multidentate phosphite ligands are also disclosed. In particular, the ligands have heteroatom-containing substituents on the carbon attached to the ortho position of the terminal phenol group.
Photochemical Oxidative Coupling of 2-Naphthols using a Hybrid Reduced Graphene Oxide/Manganese Dioxide Nanocomposite under Visible-Light Irradiation
作者:Anurag Kumar、M. S. Aathira、Ujjwal Pal、Suman L. Jain
DOI:10.1002/cctc.201701470
日期:2018.4.24
high‐yielding photocatalytic approach for the oxidative self‐dimerization of 2‐naphthols using a semiconductor–metal hybrid that consists of intercalated manganese dioxide nanoparticles in reduced graphene oxide (rGO/MnO2) under visible‐light irradiation. The desired photocatalyst was synthesized in a single step by mixing MnO2 nanoparticles with rGO ultrasonically. The hybridphotocatalyst exhibited a significantly
Highly selective oxidative cross-coupling of 2-naphthol derivatives with chiral copper(I)–bisoxazoline catalysts
作者:Tomohisa Temma、Shigeki Habaue
DOI:10.1016/j.tetlet.2005.06.098
日期:2005.8
The asymmetric oxidativecoupling reaction of 3-hydroxy-2-naphthoate and 2-naphtholderivatives with the CuCl–(S)-(−)-2,2′-isopropylidenebis(4-phenyl-2-oxazoline) catalyst under an O2 atmosphere was carried out. The reaction proceeded in a highly cross-coupling selective manner (⩽99.7%) with a moderate enantioselectivity of up to 65%.
challenging direct asymmetric catalytic aerobicoxidativecross‐coupling of 2‐naphthylamine and 2‐naphthol, using a novel CuI/SPDO system, has been successfully developed for the first time. Enantioenriched 3,3′‐disubstituted NOBINs were achieved and could be readily derived to divergent chiral ligands and catalysts. This reaction features high enantioselectivities (up to 96 % ee) and good yields (up to
首次成功开发了具有挑战性的2-萘胺和2-萘酚的直接不对称催化好氧氧化交叉偶联,使用新型Cu I / SPDO系统。获得了对映体富集的3,3'-双取代NOBIN,可以很容易地衍生出不同的手性配体和催化剂。该反应具有高对映选择性(高达96%ee)和良好的产率(高达80%)。在DFT计算表明,CF之间在F-H相互作用3的L17和2-萘酚的H-1,8,和两个联接伙伴之间的π-π堆叠可以在这个交叉偶联反应的enantiocontrol起到至关重要的作用。