Solvent-free synthesis of amidoalkyl naphthols in the presence of MWCNTs@SiO2/SO3H as effective solid acid catalyst
摘要:
Multiwalled carbon nanotubes (MWCNTs) were modified with sulfonic acid groups through a new method. In the first step, MWCNTs' surfaces were hydroxylated using KMNO4 as oxidating agent and a surfactant (TPABr). Second, SiO2-coated MWCNTs were prepared through the reaction of hydroxylated CNTs with tetraethyl orthosilicate, and in last step, MWCNTs@SiO2/SO3H was prepared using the reaction of MWCNTs@SiO2 with ClSO3H. Obtained catalyst was used as efficient solid acid catalyst for one-pot three-component condensation reaction of 2-naphthol, benzaldehyde, and amide derivatives to afford the corresponding amidoalkyl naphthols. The reaction was performed under solvent-free conditions and products were obtained in high to excellent yields (80-98%). Prepared solid acid catalyst was characterized using FT-IR, BET, TGA, SEM, and EDX techniques. Presented methodology has several advantages such as simple procedure, excellent yields of products, effective reusable solid acid catalyst, and eco-friendly reaction conditions.
Preparation and characterization of Fe3O4@SiO2@PMA:AS an efficient and recyclable nanocatalyst for the synthesis of 1-amidoalkyl-2-naphthols
作者:Mohsen Esmaeilpour、Jaber Javidi、Maryam Zandi
DOI:10.1016/j.materresbull.2014.04.019
日期:2014.7
superparamagnetic Fe 3 O 4 @SiO 2 that is synthesized based on several stages. First of all, the Fe 3 O 4 @SiO 2 nanosphere core-shell is synthesized. Then, H 3 PMo 12 O 40 nanoparticles were synthesized by the treatment of H 3 PMo 12 O 40 with n -Octane as solvent by a solvothermal method and this nano hetero polyacid immobilized onto the imidazole functionalized Fe 3 O 4 @SiO 2 nanoparticles. The
摘要 在本文中,我们报道了一种基于多个阶段合成的功能化超顺磁性 Fe 3 O 4 @SiO 2 的制备方法。首先,合成了Fe 3 O 4 @SiO 2 纳米球核壳。然后,通过溶剂热法用正辛烷作为溶剂处理H 3 PMo 12 O 40 合成H 3 PMo 12 O 40 纳米颗粒,并将该纳米杂多酸固定在咪唑官能化的Fe 3 O 4 @SiO 2 纳米颗粒上。样品的结构通过XRD、TEM、DLS、FE-SEM、FT-IR、N 2 吸附-解吸等温线分析和VSM表征。此外,还描述了一种使用 β-萘酚、醛和乙酰胺的多组分、一锅缩合反应制备酰胺烷基萘酚的有效和直接的方案,在无溶剂和微波条件下,在 Fe 3 O 4 @SiO 2 -imid-PMA n 存在下苯甲酰胺和尿素。此外,纳米催化剂可以很容易地通过磁场回收并在接下来的反应中重复使用至少 5 次,而不会明显降低催化活性。
Efficient One-Pot Syntheses of Betti Bases Catalyzed by 1-Methyl-3-(2-(sulfooxy)ethyl)-1<i>H</i>-imidazol-3-ium Chloride
The efficient one‐pot syntheses of Bettibases by the three‐component reaction of aromatic aldehyde, 2‐naphthalen, and acetonitrile (or benzamide) catalyzed by 1‐methyl‐3‐(2‐(sulfooxy)ethyl)‐1H‐imidazol‐3‐ium chloride is reported. The solvent can be recycled easily.
Eco-friendly and efficient multi-component method for preparation of 1-amidoalkyl-2-naphthols under solvent-free conditions by dodecylphosphonic acid (DPA)
作者:Maryam Zandi、Ali Reza Sardarian
DOI:10.1016/j.crci.2011.11.012
日期:2012.4
Résumé An efficient and direct eco-friendly protocol for the preparation of 1-amidoalkyl-2-naphthols employing a multi-component, one-pot condensation reaction between β-naphthol, aromatic or aliphatic aldehydes and benzamide or acetamide in the presence of dodecylphosphonic acid under solvent-free conditions has been described.
Discovery of an in situ carbocationic system using trityl chloride as a homogeneous organocatalyst for the solvent-free condensation of β-naphthol with aldehydes and amides/thioamides/alkyl carbamates in neutral media
Trityl chloride (TrCl), efficiently catalyzes the one-pot multi-component condensation of β-naphthol with aromatic aldehydes and amides/thioamides/carbamates such as acetamide, benzamide, nicotinamide, thioacetamide, and methylcarbamate under solvent-free and neutral conditions to afford 1-amido-alkyl-2-naphthols, 1-thioamido-alkyl-2-naphthols, and 1-carbamato-alkyl-2-naphthols in high yields and very
Saccharin Sulfonic Acid (SASA) as a Highly Efficient Catalyst for the Condensation of 2-Naphthol With Arylaldehydes and Amides (Thioamides or Alkyl Carbamates) Under Green, Mild, and Solvent-Free Conditions
作者:Abdolkarim Zare、Hamideh Kaveh、Maria Merajoddin、Ahmad Reza Moosavi-Zare、Alireza Hasaninejad、Mohammad Ali Zolfigol
DOI:10.1080/10426507.2012.692131
日期:2013.5.1
Abstract Saccharin sulfonic acid (SaSA) is used as a highly efficient and recyclable catalyst for the one-pot multicomponent condensation of 2-naphthol with arylaldehydes and amides (thioamides or alkyl carbamates) undergreen, mild (70 °C), and solvent-freeconditions. In this reaction, 1-amidoalkyl-2-naphthols, 1-thioamidoalkyl-2-naphthols, 1-carbamatoalkyl-2-naphthols, bis(1-amidoalkyl-2-naphthol)s