Betti bases via a one-pot three-componentreaction of 2-naphthol, substituted aldehydes and anilines in aqueous media is reported. Through screening different catalysts, reverse zinc oxide nanomicelles show good activity and high selectivity. The catalyst retained activity after six cycles of reuse and were recoverable. The method has the advantages of atom economy, short reaction time, good yield, and
Novel and potent Lewis acid catalyst: Br<sub>2</sub>-catalyzed Friedel–Crafts reactions of naphthols with aldehydes
作者:Deqiang Liang、Jingjing Li、Yanni Li、Baoling Wang、Ping Cheng、Sha Luo
DOI:10.1080/00397911.2016.1139723
日期:2016.2.16
ABSTRACT A discovery that the inexpensive Br2 can serve as a potent Lewis acidcatalyst for bis(2-hydroxy-1-naphthyl)methanes synthesis is presented. Under the catalysis of Br2 at room temperature, naphthols reacted smoothly with various aldehydes with high efficiency and broad substrate scope. This reaction used to require highly acidic conditions and/or high temperature and/or pressure, and sometimes featured
Green and diasteroselective oxidative cyclization of bisnaphthols to spirans
作者:A. Alizadeh、M. M. Khodaei、K. H. Moradi
DOI:10.1007/bf03246020
日期:2010.6
Hydrogen peroxide/MoO3, as an efficient and clean oxidizing system was used to afford diasteroselective oxidative cyclization of bisnaphthols to spirans in ethanol at 60 °C with high yields. Bisnaphthols were prepared by the reaction of a series of aldehydes and 2-naphthol in the presence of a catalytic amount of H3[P(Mo3O10)4].nH2O (HPa) in refluxing dichloromethane.
This study investigated the existence of keto-enol tautomers for the first time during the synthesis of aryl-bis(2-hydroxy-1-naphthyl)methane from 2-naphthol and p-tolualdehyde or 4-chlorobenzaldehyde in methanol using CuSO4.5H2O as catalyst under reflux condition. The exclusive formation of aryl-bis(2-hydroxy-1-naphthyl)methanes was observed in dichloromethane at room temperature in the presence of BF3.OEt2/AcOH as catalyst. The keto products were isolated and characterized by 1H NMR, 13C NMR, COSY and DEPT spectra.