- Three-component synthesis of fused indenopyridines from aromatic aldehydes, 2-bromo-2H-indene-1,3-dione and aminouracil or aminopyrazole
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Abstract: Three-component synthesis of fused indenopyridines containing pyrazole or uracil moiety by the reaction of benzaldehydes, 2-bromo-1H-indene-1,3(2H)-dione, and pyrazoles or uracil, catalyzed by ammonium acetate is reported. Graphical Abstract: [Figure not available: see fulltext.]
- Ahadi, Somayeh,Bazgir, Ayoob
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- Fe3O4?urea/HITh-SO3H as an efficient and reusable catalyst for the solvent-free synthesis of 7-aryl-8H-benzo[h]indeno[1,2-b]quinoline-8-one and indeno[2′,1′:5,6]pyrido[2,3-d]pyrimidine derivatives
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In this study, Fe3O4?urea/HITh-SO3H MNPs as a new, efficient, and recyclable solid acid magnetic nanocatalyst was synthesized and characterized using various methods including Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry, energy-dispersive X-ray spectroscopy, and X-ray powder diffraction. After the characterization of this new magnetic nanocatalyst, it was efficiently utilized for the promotion of the one-pot synthesis of 7-aryl-8H-benzo[h]indeno[1,2-b]quinoline-8-one and indeno[2′,1′:5,6]pyrido[2,3-d]pyrimidine derivatives via three-component reaction of the 1,3-indanedione, aldehyde, and 1-naphthylamine/1,3-dimethyl-6-aminouracil under solvent-free conditions at 80°C. The procedure gave the desired heterocyclic structures in high-to-excellent yields and short reaction times. Also because of the magnetic nature of the nanocatalyst, it can be separated with an external magnetic field and reused at least six runs without any considerable decrease in the catalytic behavior.
- Jiang, Shenghao,Shen, Macheng,Sheykhahmad, Fatima Rashid
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p. 648 - 662
(2020/07/03)
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- Ultrasound-promoted an efficient method for the one-pot synthesis of indeno fused pyrido[2,3-d]pyrimidines catalyzed by H3PW12O40 functionalized chitosan@Co3O4 as a novel and green catalyst
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A novel magnetically recoverable nanocomposite including Co3O4/chitosan/H3PW12O40 (Co3O4/CS/PWA) as a heterogeneous catalyst was prepared using a facile synthetic method and characterized by FT-IR, XRD, SEM, VSM and EDX. A simple, efficient and rapid synthesis of indeno[2?,1?:5,6]pyrido[2,3-d]pyrimidines was accomplished in excellent yields via one-pot three-component reaction of 1,3-dimethyl-6-aminouracil, aryl aldehydes and 1,3-indandione in the presence of amount of Co3O4/CS/PWA catalyst under ultrasound irradiation. Then, the catalyst was recovered with an external magnet and reused several times without significant loss of reactivity.
- Safari, Javad,Tavakoli, Mona,Ghasemzadeh, Mohammad Ali
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- Nano Fe2O3@SiO2–SO3H: efficient catalyst for the multi-component preparation of indeno[2′,1′:5,6]pyrido[2,3-d]pyrimidine-2,4,6(3H)-trione derivatives
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A highly efficient multi-component reaction of structurally diverse aryl aldehydes, 6-amino-1,3-dimethylpyrimidine-2,4(1H,3H)-dione and 1H-indene-1,3(2H)-dione using nano Fe2O3@SiO2–SO3H as a catalyst is described. The products are a variety of indeno[2′,1′:5,6]pyrido[2,3-d]pyrimidine-2,4,6(3H)-trione derivatives. The effect of the solvent on the product selectivity was investigated. The morphology, particle size distribution, and some properties of Fe2O3@SiO2–SO3H nanopowders have been characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray powder diffraction (XRD), N2 adsorption–desorption isotherms and thermogravimetric analysis (TGA) techniques.
- Ghashang, Majid,Guhanathan, Sai,Mansoor, S. Sheik
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p. 7257 - 7276
(2017/09/06)
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- An eco-friendly and magnetized biopolymer cellulose-based heterogeneous acid catalyst for facile synthesis of functionalized pyrimido[4,5-b]quinolines and indeno fused pyrido[2,3-d]pyrimidines in water
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Abstract: A cellulose-based magnetic nano-composite supported SO3H group was synthesized and characterized using Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, thermogravimetric analysis, X-ray diffraction, and scanning electron microscopy. Thereafter, its capability to promote the one-pot, three-component synthesis of pyrimido [4,5-b] quinolone and pyrido [2,3-d] pyrimidine derivatives was evaluated. The obtained results are indicative of excellent yields and short reaction times. The biopolymer based catalyst is readily recovered and reused several times without a decrease in yield. Graphical Abstract: [Figure not available: see fulltext.]
- Osanlou, Fatemeh,Nemati, Firouzeh,Sabaqian, Samaneh
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p. 2159 - 2174
(2017/03/22)
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- Nano-Fe3O4 encapsulated-silica particles bearing sulfonic acid groups as a magnetically separable catalyst for green and efficient synthesis of functionalized pyrimido[4,5-b]quinolines and indeno fused pyrido[2,3-d]pyrimidines in water
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The magnetic nanoparticles supported silica sulfuric acid was used as an efficient catalyst for the synthesis of pyrimido[4,5-b]quinolines and indeno fused pyrido[2,3-d]pyrimidines in water. The desired products were obtained in excellent yields. Fe3O4@SiO2-SO3H was readily recovered using an external magnet and could be reused several times without significant loss of reactivity.
- Nemati, Firouzeh,Saeedirad, Raheleh
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p. 370 - 372
(2013/07/04)
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