Multi-wall carbon nanotube supported Co (II) Schiff base complex: an efficient and highly reusable catalyst for synthesis of 1-amidoalkyl-2-naphthol and tetrahydrobenzo[<i>b</i>]pyran derivatives
作者:Jamshid Rakhtshah、Sadegh Salehzadeh
DOI:10.1002/aoc.3560
日期:2017.2
green catalyst for three‐component condensation of 2‐naphthol and acetamide with various aldehydes for the synthesis of 1‐amidoalkyl‐2‐naphthol derivativesunder solvent‐free conditions. Also, in a further study, the catalytic application was studied in the synthesis of tetrahydrobenzo[b]pyran derivatives via the condensation reaction of malononitrile and dimedone with several aromatic aldehydes. The
合成并使用傅里叶变换红外光谱,X射线衍射,扫描电子显微镜,能量色散X射线光谱,热重分析和电感耦合等离子体质量表征了固定在多壁碳纳米管上的固定化Co(II)Schiff碱配合物。光谱法。结果表明,负载的络合物是一种简便,生态友好,可回收,可重复使用的绿色催化剂,可用于2-萘酚和乙酰胺与各种醛的三组分缩合,以在溶剂-下合成1-酰胺基烷基-2-萘酚衍生物。免费条件。此外,在进一步的研究中,还研究了催化在四氢苯并[ b]的合成中的应用。通过丙二腈和二甲酮与几种芳香醛的缩合反应生成] pyran衍生物。此处建议的合成1-氨基烷基-2-萘酚和四氢苯并[ b ]吡喃衍生物的方法具有多个优点,例如催化剂的稳定性,可回收性和生态友好性,简单的实验条件,较短的反应时间,高至优异产量高且易于处理。
Mn(III)-pentadentate Schiff base complex supported on multi-walled carbon nanotubes as a green, mild and heterogeneous catalyst for the synthesis of tetrahydrobenzo[<i>b</i>
]pyrans via tandem Knoevenagel-Michael cyclocondensation reaction
作者:Jamshid Rakhtshah、Sadegh Salehzadeh、Mohammad Ali Zolfigol、Saeed Baghery
DOI:10.1002/aoc.3690
日期:2017.9
coupled plasma mass spectrometry, elemental analysis and thermogravimetric analysis. A facile, eco‐friendly, mild and green procedure was developed for the one‐pot three‐component synthesis of tetrahydrobenzo[b]pyrans via tandem Knoevenagel–Michael cyclocondensation reactions between aromatic aldehydes, 1,3‐diones and malononitrile using a catalytic amount of Mn(III)–pentadentate Schiff base complex
Zn (II)‐Schiff base covalently anchored to CaO@SiO
<sub>2</sub>
: A hybrid nanocatalyst for green synthesis of 4
<i>H</i>
‐pyrans
作者:Fatemeh Sameri、Mohammad Ali Bodaghifard、Akbar Mobinikhaledi
DOI:10.1002/aoc.6394
日期:2021.11
In this study, the Zn (II)-Schiff basecovalentlyanchored onto the surface of CaO@SiO2 nanoparticles. The structure of this hybrid nanomaterial (CaO@SiO2-NH2-Sal-Zn) was characterized using the analytical techniques such as Fourier transform infrared spectroscopy, field emission-scanning electron microscopy, X-ray powder diffraction, energy-dispersive X-ray spectroscopy, transmission electron microscopy
A Facile, Eco-friendly, Proton Donor-Acceptor Catalyzed, One-Pot, Three-Component Synthesis of Tetrahydrobenzo[b]pyrans
作者:A. Indrasena、Sd. Riyaz、A. Naidu、P.K. Dubey
DOI:10.14233/ajchem.2014.15657
日期:——
Piperidinium acetate catalyzed, three-component cyclocondensation between aryl aldehydes (1), malononitrile (2) and cyclic-1,3-diketo compounds (3) in the eco-friendly and universal solvent water at room temperature for 0.5 h, resulted in the formation of tetrahydro[b]pyran derivatives (4). The formation of 4 could also be established in a step-wise fashion by isolating independently each of the intermediates benzylidine malononitrile 5 and benzylidine cyclohexane-1,3-dione 6 and treating them subsequently with 3 and 2, respectively to obtain benzopyrans 4. Mechanistic studies on the formation of 4 from 1, 2 and 3 are reported. Further, the synthesis of 4 could also be achieved in two variable but identical end-product giving tandem syntheses by treating 1 with 2 and then with 3 giving 4 or by treating 1 with 3 and then with 2 giving 4. All the products were suitably characterized using NMR, IR and Mass spectroscopy.
A Novel Task Specific & Thermally Stable Ionic Liquid (TBA Acetate) for the Synthesis of Pyran Annulated Heterocyclic System
作者:Sd. Riyaz、A. Indrasena、A. Naidu、P.K. Dubey
DOI:10.2174/1570178611310060007
日期:2013.6.1
A simple and efficient synthesis of pyran annulated heterocyclic compounds has been developed by reaction of
aryl aldehydes, malanonitrile and cyclic-1,3-diketones using tetra butyl ammonium acetate (TBAA) melt as cost-effective
and recyclable ionic liquid under solvent-free i.e green conditions at 100 °C for 10 minutes without additional use of catalyst.