- Choline chloride-coated UiO-66-Urea MOF: A novel multifunctional heterogeneous catalyst for efficient one-pot three-component synthesis of 2-amino-4H-chromenes
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A new Zr-based MOF, namely, UiO-66-Urea, was prepared through polymerization between the 2-aminoterephthalate linkers of UiO-66-NH2 MOF and 1,4-phenylene diisocyanate under mild reaction conditions. Post-synthetic coating of UiO-66-Urea with ch
- Akbarian, Mohadeseh,Daliran, Saba,Oveisi, Ali Reza,Sanchooli, Esmael
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- Bipyridinium chloride supported rice husk silica: An efficient nanocomposite for the one-pot preparation of spirooxindole pyran and 2-amino-4h-chromene derivatives
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In this paper, rice-husk-silica supported n-propyl bipyridinium chloride (RHPrBPCl) has been prepared as a heterogeneous catalyst. RHPrBPCl has been successfully applied in the one-pot preparation of spirooxindole pyran and 2-amino- 4H-chromene derivative
- KIASAT, Ali Reza,HAMID, Sheida,SAGHANEZHAD, Seyyed Jafar
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p. 927 - 934
(2021/02/05)
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- Organocatalytic Cascade Knoevenagel–Michael Addition Reactions: Direct Synthesis of Polysubstituted 2-Amino-4H-Chromene Derivatives
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Abstract: In this report, we documented novel strategy for the synthesis of bioactive polysubstituted 2-amino-4H-chromine derivatives under a heterogeneous Al-MCM-41-LDH@APTES (ALAM) catalysis. A synthetic procedure is developed to prepare Al-MCM-41-LDH@APTES (ALAM) heterogeneous basic catalysts. Mesoporous Al-MCM-41 is functionalized by known grafting chemistry via layered double hydroxide (LDH) nanosheets and (3-aminopropyl)triethoxysilane (APTES) moiety as a basic organocatalyst. The resulting catalysts contain amino group functionality on the external surface as well as inside the layers and the basicity can be tuned by the loading of APTES. The samples were fully characterized by 29Si and 13C CP/MAS NMR, infrared absorption spectroscopy, TEM, XPS, EDX, TGA, XRD, CO2-TPD, N2 adsorption isotherms measurements, and they were successfully examined for the cascade type Knoevenagel–Michael addition reactions. The product yields associated with these substrates were optimized, and key reaction parameters affecting the yields were identified. The present catalytic method is simple and robust for diversity oriented synthesis which proceeds good to excellent yields without generating any hazards waste. The broad substrate scope, excellent functional group compatibility makes this protocol highly useful towards synthesis of polysubstituted α-cyanoacrylates, α-cyanoacrylonitriles and 2-amino-4H-chromenes with an electron-donating or electron-withdrawing group. We have also successfully established a flow reaction system, gram-scale synthesis as well as catalyst recyclability up to six catalytic cycles without appreciable loss of its activity. Graphic Abstract: [Figure not available: see fulltext.].
- Jadhav, Sanjay N.,Patil, Seema P.,Sahoo, Dipti Prava,Rath, Dharitri,Parida, Kulamani,Rode, Chandrashekhar V.
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p. 2331 - 2351
(2020/02/25)
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- One-pot Synthesis of 2-Amino-4H-Chromenes using Chicken Eggshell Waste as Green Catalyst under Solvent-Free Conditions
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Chicken eggshell waste has been employed as green and efficient catalyst for the preparation of 2-amino-4H-chromenes. The aromatic aldehydes were condensed with malononitrile and 1-naphthol or 2-naphthol under solvent-free condition in the presence of chi
- Gadhave, Anil,Uphade, Bhagwat
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p. 387 - 394
(2021/01/25)
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- A one-pot green synthesis of 2-amino-4H-benzo[h]chromenes catalyzed by a dioxomolybdenum Schiff base complex supported on magnetic nanoparticles as an efficient and recyclable nanocatalyst
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In this work, catalytic performance of a molybdenum Schiff base complex-supported magnetic support as a nanocatalyst was evaluated for the preparation of 2-amino-4H-benzo[h]chromenes through one-pot, three component reactions of 1-naphthol, various aldehydes, and malononitrile under solvent-free conditions. A promising greener and eco-friendly method with a short reaction time, high yield of products, and simple work-up procedure was achieved. The nanocatalyst could be easily separated and regenerated from reaction media by an external magnet and reused at least seven consecutive times with small drops in its catalytic performance.
- Aghajani, Milad,Monadi, Niaz
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p. 775 - 784
(2019/03/20)
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- Synthesis and characterization of a novel Fe3O4@SiO2-BenzIm-Fc[Cl]/BiOCl nano-composite and its efficient catalytic activity in the ultrasound-assisted synthesis of diverse chromene analogs
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In this study, a novel magnetically recoverable Fe3O4@SiO2-BenzIm-Fc[Cl]/BiOCl nano-composite was synthesized using a simple chemical co-precipitation method. This is the first time that a magnetic nano-catalyst bearing ionic liquid, ferrocene and BiOCl is synthesized. The Fe3O4@SiO2-BenzIm-Fc[Cl]/BiOCl nano-composite was characterized by Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and field emission scanning electron microscopy (FE-SEM) techniques. The catalytic activities of the novel magnetic nano-composite were evaluated in one-pot three-component synthesis of a wide variety of 2-amino-3-cyano-4H-chromene derivatives under ultrasound irradiation. A simple, facile and highly efficient ultrasound-assisted method was developed to synthesize 4H-chromene derivatives via one-pot, three-component reaction of aldehyde, malononitrile and active phenolic compounds (2-naphthol, 1-naphthol, 3-(dimethylamino)phenol, resorcinol and orcinol) at room temperature. The reaction of aldehyde, malononitrile and orcinol is newly introduced in this paper. The ultrasound-assisted synthesis protocol that was studied in this article exhibits some notable advantages such as short reaction times, operational simplicity, green reaction conditions, high yields and easy work-up and purification steps. In addition, the novel magnetic nano-composite could be easily recovered by an external magnetic field and reused for six-reaction cycles without significant loss of its catalytic activity.
- Mohammadi, Reza,Esmati, Somayeh,Gholamhosseini-Nazari, Mahdi,Teimuri-Mofrad, Reza
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supporting information
p. 135 - 145
(2019/01/04)
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- Bipyridinium chloride supported rice husk silica: An efficient nanocomposite for the one-pot preparation of spirooxindole pyran and 2-amino-4H-chromene derivatives
-
In this paper, rice-husk-silica supported n-propyl bipyridinium chloride (RHPrBPCl) has been prepared as a heterogeneous catalyst. RHPrBPCl has been successfully applied in the one-pot preparation of spirooxindole pyran and 2-amino-4H-chromene derivatives
- Hamid, Sheida,Kiasat, Ali Reza,Saghanezhad, Seyyed Jafar
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p. 927 - 934
(2020/06/27)
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- A molybdenum(VI) Schiff base complex immobilized on functionalized Fe3O4 nanoparticles as a recoverable nanocatalyst for synthesis of 2-amino-4H-benzo[h]chromenes
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A dioxomolybdenum(VI) complex of a Schiff base, immobilized on the surface of modified Fe3O4 with a silica coating, has been synthesized and characterized by spectroscopic and microscopic techniques including FTIR, TGA, ICP, SEM, EDX, VSM, and XRD analyses. The catalytic performance of this material has been evaluated for the preparation of 2-amino-4H-benzo[h]chromenes via the one-pot, three-component reaction of aldehydes, malononitrile, and 1-naphthol under solvent-free conditions. The benefits of this protocol are short reaction time, simple workup procedure, and high yields of products. Also, the synthesized nanocatalyst could be separated easily from the reaction mixture using an external magnet and reused for four consecutive times with only minor degradation of its catalytic performance.
- Monadi, Niaz,Moradi, Elham
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p. 161 - 170
(2018/02/06)
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- Grinding synthesis of 2-AMINO-4H-chromenes using 3,3-(BUTANE-1,4-DIYL) BIS (1,2-DIMETHYL-1H-IMIDAZOLE-3-IUM)Br-CAN as a novel reagent
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A clean and environmentally benign route to 2-Amino-4H-chromenes has been developed via three-component condensation reaction of various benzyl alcohols, malononitrile and 1-naphthol, using a catalytical amount of CAN and a reusable ionic liquid 3,3-(Buta
- Nikpassand, Mohammad,Fekri, Leila Zare,Ahmadi, Parvin
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p. 3399 - 3402
(2017/05/22)
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- Aegle marmelos in heterocyclization: Greener, highly efficient, one-pot three-component protocol for the synthesis of highly functionalized 4 H -benzochromenes and 4 H -chromenes
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A facile, one-pot three-component protocol for the synthesis of 2-amino-4H-chromene derivatives has been demonstrated using Bael Fruit Extract (BFE) as a natural catalyst in a green reaction medium. This method offers a mild, efficient and highly economic
- Shinde, Sachin,Damate, Shashikant,Morbale, Smita,Patil, Megha,Patil, Suresh S.
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p. 7315 - 7328
(2017/02/05)
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- One-pot synthesis of some 2-amino-4H-chromene derivatives using triethanolamine as a novel reusable organocatalyst under solvent-free conditions and its application in electrosynthesis of silver nanoparticles
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A wide variety of 2-amino-4H-chromene derivatives with diverse substituents on the 4H-chromene ring were efficiently prepared via one-pot three-component reaction of an aromatic aldehyde and malononitrile with 2-hydroxynaphthalene-1,4-dione, ethyl acetoac
- Maleki,Baghayeri,Sheikh,Babaee,Farhadi
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p. 1064 - 1072
(2017/06/29)
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- One-pot catalytic multicomponent synthesis of chromene derivatives by 1-Allyl-3-Methyl-Imidazolium halides
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2-amino-3-cyano-4-aryl-4H-benzo[h]chromenes and 2-amino-3- cyano-1-aryl-1H-benzo[f] chromenes were obtained in a one-pot three-component reaction of a or β-naphthol (1a and 1b), aromatic aldehydes (2a-n), malononitrile (3) in the presence of 1-allyl-3-met
- Azizkhani, Vahid,Amirloo, Mohammad Reza,Mohammadi, Bagher,Moradi, Ali Reza
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p. 831 - 837
(2018/04/09)
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- Application of {[4,4′-BPyH][C(CN)3]2} as a Bifunctional Nanostructured Molten Salt Catalyst for the Preparation of 2-Amino-4 H -chromene Derivatives under Solvent-Free and Benign Conditions
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The bifunctional nanostructured molten salt [4,4′-bipyridine]-1,1′-diium tricyanomethanide has been employed as a highly efficient and powerful catalyst for the preparation of 2-amino-4H-chromenes. A wide variety of aromatic aldehydes was condensed with m
- Zolfigol, Mohammad Ali,Yarie, Meysam,Baghery, Saeed
-
supporting information
p. 1418 - 1422
(2016/06/01)
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- CaO-ZrO2 nanocomposite oxide prepared by urea hydrolysis method as heterogeneous base catalyst for synthesis of chromene analogues
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A series of CaO–ZrO2 nanocomposite oxides containing 2–50?mol% of CaO were synthesized employing urea as a mild hydrolyzing agent. The nanocomposite systems were characterized using XRD, Fourier analysis, TPD, Raman, XPS, TGA-DSC, FESEM, HRTEM,
- Pradhan, Sagnika,Sahu, Vivekananda,Mishra
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p. 297 - 309
(2016/12/07)
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- Polystyrene-supported basic dicationic ionic liquid as a novel, reusable, and efficient heterogeneous catalyst for the one-pot synthesis of chromene derivatives in water
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Polystyrene-supported 1,4-bis(3-methylimidazolium-1-yl)butane dihydroxide basic dicationic ionic liquid was prepared by supporting the ionic liquid onto highly cross-linked chloromethylated polystyrene. FT-IR, SEM, TG-DTA, and elemental analysis were empl
- Heidarizadeh, Fariba,Taheri, Narges
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p. 3829 - 3846
(2016/04/05)
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- Ba/ZrO2 nanoparticles as efficient heterogeneous base catalyst for the synthesis of β-nitro alcohols and 2-amino 2-chromenes
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Zirconia nanoparticles were synthesized by precipitation, urea hydrolysis, amorphous citrate and combustion synthesis methods. The zirconia surface was subsequently modified by grafting Ba 2+ species. The Ba 2+ modified zirconia (Ba/ZrO 2) materials were characterized using XRD, Fourier analysis, UV-vis-DRS, FESEM and HRTEM techniques. XRD study indicated selective stabilization of the tetragonal phase of zirconia in the presence of Ba 2+ species. Fourier line profile analysis of the XRD peaks revealed that the average crystallite size of the zirconia nanoparticles is in the range of 5-15 nm. The surface area, basicity and barium content of the material depend strongly on the method of synthesis. The Ba/ZrO 2 catalyst prepared by urea hydrolysis method exhibited higher surface area and barium content compared to other samples. The catalytic activity of the Ba/ZrO 2 catalyst was evaluated for synthesis of β-nitro alcohols and 2-amino 2-chromenes. The β-nitro alcohols were synthesized by condensation of aryl aldehydes and nitromethane. Similarly, the 2-amino 2-chromenes were synthesized by condensation of arylaldehydes, α-naphthol and malononitrile. The Ba/ZrO 2 catalyst was found to be highly efficient for synthesis of both classes of compounds providing excellent yield and purity of the products. [Figure not available: see fulltext.]
- Pradhan, Sagnika,Swarnima, Kumari,Mishra
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p. 1119 - 1130
(2016/07/15)
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- Application of novel multi-cationic ionic liquids in microwave assisted 2-amino-4H-chromene synthesis
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Novel multi-cationic ionic liquids containing a mesitylene backbone with acetate and methane sulphonate anions have been synthesized. These ionic liquids were used for the synthesis of 2-amino-4H-chromenes under microwave heating. The effects of nature and amount of ionic liquids on the yield and reaction time were thoroughly investigated. The ionic liquids showed a considerable level of reusability without a significant decrease in catalytic activity. We have successfully combined the advantages of microwave technology with ionic liquids to facilitate the rapid construction of chromene skeletons from readily obtainable and inexpensive materials via a multicomponent strategy.
- Kumbhar, Arjun,Jadhav, Sanjay,Shejwal, Rajendra,Rashinkar, Gajanan,Salunkhe, Rajshri
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p. 19612 - 19619
(2016/03/01)
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- Synthesis of pyran annulated heterocyclic scaffolds: A highly convenient protocol using dimethylamine
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A facile and rapid three-component synthesis of pharmaceutically diverse pyran annulated heterocycles has been developed via a one-pot condensation of aromatic aldehydes, malononitrile, and different enolizable C-H-activated acidic compounds in the presen
- Ramesh, Rathinam,Lalitha, Appaswami
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p. 8009 - 8017
(2015/02/19)
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- Synthesis and Antimicrobial Activity of Mono, Bis and Tris 2-Amino-4HChromenes
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A clean and environmentally benign route to 2-amino-4H-chromenes has been developed using the reaction between various benzaldehydes, malononitrile and α-naphthol in the presence of 3,3′-(pentane-1,5-diyl)bis(1,2-dimethyl-1H-imidazol-3-ium) bromide. The p
- Nikpassand, Mohammad,Fekri, Leila Zare,Badri, Hanieh,Asadpour, Leila
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p. 685 - 692
(2016/03/25)
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- Nano polypropylenimine dendrimer (DAB-PPI-G1): As a novel nano basic-polymer catalyst for one-pot synthesis of 2-amino-2-chromene derivatives
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The nano polypropylenimine dendrimer (DAB-PPI-G1) Lewis base catalyst was found to be a highly efficient and recoverable catalyst for the rapid and convenient synthesis of 2-amino-2-chromene derivatives through the three-component condensation of aromatic aldehydes, malononitrile or ethyl cyanoacetate and phenols under solvent-free conditions in excellent yields and short reaction times.
- Maleki, Behrooz,Sheikh, Safoora
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p. 42997 - 43005
(2015/05/27)
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- Highly efficient organocatalytic synthesis of diverse and densely functionalized 2-amino-3-cyano-4H-pyrans under mechanochemical ball milling
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An improved one-pot three-component and environmentally benign approach for the synthesis of a wide range of densely functionalized 2-amino-3-cyano-4H-pyran annulated derivatives has been described by the reaction of aryl aldehydes, malononitrile and dive
- Dekamin, Mohammad G.,Eslami, Mohammad
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p. 4914 - 4921
(2015/01/08)
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- Covalently anchored n-propyl-4-aza-1-azoniabicyclo[2.2.2]octane chloride on SBA-15 as a basic nanocatalyst for the synthesis of pyran heterocyclic compounds
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In the present study, highly ordered n-propyl-1,4 diazoniabicycle[2.2.2] octane chloride functionalized mesoporous SBA-15, SBA-DABCO, with high surface area and narrow pore-size distribution was synthesized and characterized by TEM, SEM, FT-IR, CHN, TGA,
- Davarpanah, Jamal,Kiasat, Ali Reza
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p. 4403 - 4412
(2014/01/17)
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- Synthesis and characterization of benzochromeno[2,3-b]tetrahydroquinolinone derivatives
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We report on a novel method for the preparation of a new series of benzochromeno[2,3-b]tetrahydroquinolin-1-one derivatives. The title compounds are prepared by the 5-substituted-1,3 -cyclohexanedione and 3-amino-1-aryl-1H- benzo[f]chromene-2-carbonitrile
- Han, Guang-Fan,Wang, Ming,Jin, Yan,Chen, Li-Zhuang
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p. 648 - 655
(2014/06/10)
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- Synthesis of a novel piperidine-functionalized poly(ethylene glycol) bridged dicationic ionic liquid and its application in one-pot synthesis of substituted 2-amino-2-chromenes and 3,4-dihydropyrano[3,2-c]chromenes in aqueous media
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A novel piperidine-functionalized poly(ethylene glycol) bridged dicationic ionic liquid was prepared and identified. It was used as a recyclable catalyst for the synthesis of substituted 2-amino-2-chromenes and 3,4-dihydropyrano[3,2- c]chromenes with exce
- Wang, Yinglei,Luo, Jun,Xing, Tantan,Liu, Zuliang
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p. 1871 - 1876
(2014/01/06)
-
- Silica-bonded N-propylpiperazine sodium n-propionate as recyclable catalyst for synthesis of 4H-pyran derivatives
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Silica-bonded N-propylpiperazine sodium n-propionate (SBPPSP) was found to act as an efficient solid base for the preparation of a series of 4H-benzo[b]pyran derivatives. SBPPSP was used as a recyclable heterogeneous solid base catalyst for the synthesis
- Niknam, Khodabakhsh,Borazjani, Nassim,Rashidian, Reza,Jamali, Abbas
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p. 2245 - 2254
(2014/01/06)
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- On water CuSO4. 5H2O-catalyzed synthesis of 2-amino-4H-chromenes
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Sustainable development is a balance between environment and development. Sustainable development requires sustainable supplies of clean, affordable, and renewable energy sources that do not cause negative impact to the society. This article introduces a
- Behbahani, Farahnaz Kargar,Maryam, Sadeghi
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p. 357 - 360
(2013/07/26)
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- Highly efficient conversion of fused 2-amino-4-aryl-4H-chromene-3- carbonitriles into fused 2-oxo-4-aryl-2H-chromene-3-carbonitriles using Vilsmeier conditions
-
A simple, mild, and highly efficient protocol for the synthesis of fused 2-oxo-4-aryl-2H-chromene-3-carbonitriles has been developed starting from fused 2-amino-4-aryl-4H-chromene-3-carbonitriles utilizing Vilsmeier conditions.
- Banothu, Janardhan,Velpula, Ravibabu,Gali, Rajitha,Bavantula, Rajitha,Crooks, Peter A.
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p. 3862 - 3864
(2013/07/05)
-
- Basic magnetic nanoparticles as efficient catalysts for the preparation of naphthopyrane derivatives
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Aminosilane-functionalised spinel ferrite oxide (Fe2O 3 ) magnetic nanoparticles have been synthesised and used as efficient heterogeneous base catalysts for the condensation of aromatic aldehydes with malonitrile and α (or β) naphth
- Yarahmadi, Hossein,Shaterian, Hamid Reza
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experimental part
p. 49 - 51
(2012/04/04)
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- Multi-component synthesis of 2-amino-4h-chromenes catalyzed by nano zno in water
-
Naphthalenediols, 1-and 2-naphthols, and phenols in the presence of nano ZnO as catalyst and water as green solvent react with methylenemalononitrile, generated in situ from aldehyde and malononitrile, to yield 2-amino-4H- chromenes.
- Hosseini-Sarvari, Mona,Shafiee-Haghighi, Sara
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experimental part
p. 1285 - 1298
(2012/04/04)
-
- One pot synthesis of benzopyrans in water as green solvent
-
A convenient synthesis of polyfunctionalized benzopyran derivatives using tricaprylyl methyl ammonium chloride (aliquate-336) as a catalysts (10 mol %) is described. The catalyst found to be an effective for the synthesis of various benzopyran derivatives
- Kumar, Sunil,Khalid, Saifuddin,Udupi
-
experimental part
p. 2685 - 2688
(2010/10/21)
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- Exploitation of the catalytic efficacy of Mg/Al hydrotalcite for the rapid synthesis of 2-aminochromene derivatives via a multicomponent strategy in the presence of microwaves
-
Mg/Al hydrotalcite, a heterogeneous base catalyst, was found to be highly effective for the synthesis of 2-aminochromenes via a multicomponent reaction of aromatic aldehydes, malononitriles and 1-naphthol under microwaves. The reaction is rapid, clean and
- Surpur, Mandar P.,Kshirsagar, Siddheshwar,Samant, Shriniwas D.
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experimental part
p. 719 - 722
(2011/02/27)
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- A one-pot multicomponent reaction for the synthesis of 2-amino-2-chromenes promoted by N,N-dimethylamino-functionalized basic ionic liquid catalysis under solvent-free condition
-
A simple, clean, and environmentally benign three-component process to the synthesis of 2-amino-4H-chromenes using N,N- dimethylaminoethylbenzyldimethylammonium chloride, [PhCH2Me 2N+CH2CH2NMe2/
- Chen, Lu,Huang, Xu-Jiang,Li, Yi-Qun,Zhou, Mei-Yun,Zheng, Wen-Jie
-
experimental part
p. 45 - 47
(2010/03/24)
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- Solvent-free one-pot approach for synthesis of substituted 2-aminochromenes
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(Chemical Equation Presented) A solvent-free one-pot approach for the preparation of 2-aminochromenes in the presence of NaHCO3 by grinding was described. Its advantages are easy work-up, mild reaction condition, high yield and environmental compatibility.
- Zhou, Dong,Ren, Zhongjiao,Cao, Weiguo,Chen, Jie,Deng, Hongmei
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experimental part
p. 1865 - 1867
(2009/06/08)
-
- An efficient synthesis of 2-aminobenzochromene derivatives catalysed by tetrabutylammoniumbromide (TBABr) under microwave irradiation in aqueous medium
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TBABr efficiently catalyzes the three-component coupling of substituted aldehyde, α-naphthol or β-naphthol and malononitrile to afford the corresponding 2-aminobenzochromene, the new protocol under microwave irradiation works in the absence of organic sol
- Paesha,Jayaeshankara
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p. 1328 - 1331
(2008/09/18)
-
- Convenient method for synthesis of substituted 2-amino-2-chromenes
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Some substituted 2-amino-2-chromenes were synthesized by the reaction of arylidenemalononitriles with 1-naphthol or 2-naphthol in the presence of sodium hydroxide as catalyst under solvent-free condition. Copyright Taylor & Francis Group, LLC.
- Zhang, Ai-Qin,Zhang, Ming,Chen, Huan-Huan,Chen, Jun,Chen, Hai-Yan
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p. 231 - 235
(2007/10/03)
-
- Clean, one-pot synthesis of naphthopyran derivatives in aqueous media
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A general and practical one-pot synthesis of naphthopyran derivatives using hexadecyltrimethylammonium bromide (HTMAB) as catalyst (10 mol%) is described. This method provides several advantages such as neutral conditions, high yields and simple workup pr
- Jin, Tong-Shou,Zhang, Jian-She,Liu, Li-Bin,Wang, Ai-Qing,Li, Tong-Shuang
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p. 2009 - 2015
(2007/10/03)
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- Efficient synthesis of benzo[g]- and benzo[h]chromene derivatives by one-pot three-component condensation of aromatic aldehydes with active methylene compounds and naphthols
-
A convenient procedure is reported for the synthesis of benzo[g]-and benzo[h]chromene derivatives via one-pot three-component condensation of aromatic aldehydes with malononitrile or ethyl cyanoacetate and 1-or 2-naphthol in the presence of 10 mol % of ti
- Sunil Kumar,Srinivasulu,Udupi,Rajitha,Thirupathi Reddy,Narsimha Reddy,Kumar
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p. 1813 - 1815
(2007/10/03)
-
- An Efficient and Convenient Approach to the Synthesis of Benzopyrans by a Three-Component Coupling of One-Pot Reaction
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A general and practical chemistry route to the synthesis of polyfunctionlized benzopyrans using tetrabutylammonium bromide (TBABr) as the catalyst (10 mol%) is described. This method provides several advantages such as neutral conditions, high yields and simple work-up procedure. In addition, water was chosen as a green solvent.
- Jin, Tong-Shou,Xiao, Jin-Chong,Wang, Su-Juan,Li, Tong-Shuang,Song, Xin-Ru
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p. 2001 - 2004
(2007/10/03)
-