A small library of 1-aminoalkyl 2-naphthols has been synthesized through the direct Mannich reaction of 2-naphthols with (hetero)aromatic aldehydes and secondary amines. All of the Mannich bases having a thiophen-2-yl ring in their structure had good activity against Gram-positive bacteria, irrespective of the nature of the amino moiety.
Nanocrystalline TiO2–HClO4 catalyzed three-component preparation of derivatives of 1-amidoalkyl-2-naphthol, 1-carbamato-alkyl-2-naphthol, 1-(α-aminoalkyl)-2-naphthol, and 12-aryl-8,9,10,12-tetrahydrobenzo[a]-xanthen-11-one
作者:Hamid Reza Shaterian、Majid Mohammadnia
DOI:10.1007/s11164-012-0938-6
日期:2013.11
1-Amidoalkyl-2-naphthols, 1-carbamatoalkyl-2-naphthols, and 1-(α-aminoalkyl)-2-naphthols have been prepared by three-component reaction of 2-naphthol, aromatic aldehydes, and NH compounds, i.e. amides, carbamates, and secondary amines, respectively, in the presence of a catalytic amount of nanocrystalline TiO2–HClO4. In addition, 12-aryl-8,9,10,12-tetrahydrobenzo[a]-xanthen-11-one derivatives have been synthesized by reaction of 2-naphthol, aromatic aldehydes, and dimedone in the presence of the same nano catalyst. These reactions were studied under solvent-free conditions. This white acidic heterogeneous catalyst is very stable under the reaction conditions and was reused several times without significant loss of activity.
The sol-gel auto-combustion method was applied for preparation of SrFe12O19 magnetic nanoparticles (MNPs). Then, the prepared SrFe12O19 was analyzed by VSM, FT-IR, SEM, N-2 adsorption-desorption and XRD pattern. According to the hysteresis loops of SrFe12O19 MNPs, its magnetic saturation was about 79emu/g and also it is a typical feature of ferromagnetic compound. SEM image showed semi-spherical particles with average size of 70nm. The BET surface area of SrFe12O19 MNPs was 10.4m(2)/g. Moreover, the catalytic activity of SrFe12O19 MNPs was tested for the first time toward the Betti reaction. The results showed that it is an efficient catalyst which can be easily separated from the reaction mixture using an external magnet and gives the pure products in high yields within short reaction time.
Solventless Synthesis of 1-(α-aminoalkyl) Naphthols, Betti Bases, Catalyzed by Nanoparticle Fe<sub>3</sub>O<sub>4</sub> at Room Temperature
作者:Fatemeh Janati、Majid M. Heravi、Ahmad Mir Shokraie
DOI:10.1080/15533174.2012.762381
日期:2015.1.2
A series of 1-(alpha-aminoalkyl) naphthols were synthesized expeditiously in good yields and selectivity from 2-naphthol, alkylamines and aldehydes in the presence of nanoparticle Fe3O4 at room temperature in solvent-free conditions.
Non-ionic surfactant catalyzed synthesis of Betti base in water
作者:Atul Kumar、Maneesh Kumar Gupta、Mukesh Kumar
DOI:10.1016/j.tetlet.2010.01.056
日期:2010.3
We have developed an efficient non-ionic surfactant (Triton X-100) catalyzed multicomponent synthesis of Betti base from secondary amine, aromatic aldehydes, and beta-naphthol using Mannich-type reaction in water. Lewis and Bronsted acid catalysts, ionic and non-ionic surfactant have been screened for the reaction. Non-ionic surfactant (Triton X-100) gave the best results and the reaction proceeds through the imine formation, which is stabilized by colloidal dispersion and undergoes nucleophilic addition to afford the corresponding N,N-dialkylated Betti base in excellent yields. (C) 2010 Elsevier Ltd. All rights reserved.