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Most Cited Articles | BenthamScience

Expeditious Synthesis of 2-Amino-4H-chromenes and 2-Amino-4H-pyran-3- carboxylates Promoted by Sodium Malonate ... Highly Efficient and Regioselective Synthesis of a Novel Pyrrole- Linked benzo[f]chromene Scaffold in a Green Media. ... Operationally Simple and Efficient Synthesis of 7-Benzylidene-substitutedphenyl- 3,3a,4,5,6,7-hexahydro-2H ...

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Cysteic acid grafted to magnetic graphene oxide as a ...

Recent catalytic systems for the synthesis of 4H-chromene derivatives consist of Fe(HSO 4) 3 28, nickel nanoparticles 29, ZrO 2 nanoparticles 30, Zn 4 O(H 2 N-TA) 3 31, ZnS nanoparticles 32, nano ...

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ChemInform: Vol 47, No 52 - Wiley Online Library

ChemInform Abstract: Novel Synthesis of Tryptamine Derived 4-Hydroxy-4-arylthiazolidine-2-thiones and 4-Arylthiazole-2 (3H)-thiones by Multicomponent Reactions. Nepram Sushuma Devi, Sarangthem Joychandra Singh, Kuldeep Mahiya, Okram Mukherjee Singh, Hojune Choi, Sang-Gyeong Lee., First Published: 06 December 2016.

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ChemInform: Vol 46, No 24 - Wiley Online Library

ChemInform Abstract: Regioselective Formation of 5-Methylene-6-methoxy-1,4,5,6-tetrahydropyridazines from the [4 + 2]-Cycloaddition Reaction of in situ Generated 1,2-Diaza-1,3-dienes with Methoxyallene. Orazio A. Attanasi, Gianfranco Favi, Fabio Mantellini, Serena Mantenuto, Giada Moscatelli, Simona Nicolini.

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Microwave-Assisted Three-Component "Catalyst and Solvent ...

A green and highly efficient method has been developed for the one-pot synthesis of tetrahydrobenzo[ b ]pyrans via a three-component condensation of aldehydes, 1,3-cyclic diketones, and malononitrile under MW irradiation without using any catalyst and solvent. This transformation presumably occurs by a sequential Knoevenagel condensation, Michael …

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Publications | Goutam Brahmachari

Publications. 206. Goutam Brahmachari, Anindita Bhowmick and Indrajit Karmakar (2021). Visible Light-Driven and Singlet Oxygen-Mediated Photochemical Cross-Dehydrogenative C 3 –H Sulfenylation of 4-Hydroxycoumarins with Thiols Using Rose Bengal as a Photosensitizer. The Journal Organic Chemistry, 86, 9658-9669.

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Recent developments in utility of green multi-component ...

Abstract Developments made since 2010 in the utilization of multi-component reactions as green efficient methodologies for the synthesis of polysubstituted pyrans, thiopyrans, pyridines, and pyrazoles are reviewed and the mechanisms of these processes are discussed. Reference is made to classical older synthetic methods developed earlier in our laboratories. Graphical …

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Crystal structure of 3-amino-1-(4-meth-oxy-phen-yl)-1H ...

Crystal structure of 3-amino-1-(4-meth-oxy-phen-yl)-1H-benzo[f]chromene-2-carbo-nitrile. Mohamed SK(1), Horton PN(2), Akkurt M(3), Younes SH(4), Albayati MR(5). Author information: (1)Chemistry and Environmental Division, Manchester Metropolitan University, Manchester M1 5GD, England ; Chemistry Department, Faculty of Science, Minia University ...

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Rapid and green synthesis of 4H-benzo[b]pyrans using ...

4H-benzo[b]pyrans were obtained rapidly in high yields using triethanolamine as an efficient, eco-friendly and low-cost basic catalyst. One-pot three-component condensation reaction of a series of aldehydes, malononitrile and 1,3-diketones was performed at room temperature. All the products were obtained in high-to-excellent yields and characterized in detail.

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One-pot solvent-free rapid and green synthesis of 3,4 ...

Abstract An easy solvent-free method is described for the synthesis of 3,4-dihydropyrano[c]chromenes by a one pot three component coupling reaction of aromatic aldehydes, malononitrile, and 4-hydroxycoumarin using basic ionic liquid as the catalyst by grindstone chemistry. The salient features of this one pot protocol are short reaction times, …

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Convenient and efficient method for synthesis of ...

An eco-friendly and efficient straightforward method has been developed for the synthesis of ethyl 3-amino-1-aryl-1H-benzo[f]chromene-2-carboxylate derivatives via 1,4-diazabicyclo[2.2.2]octane ...

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Chromenes: potential new chemotherapeutic agents for ...

Design, synthesis, and anti-breast cancer activity in vivo of 4-amino-2H-benzo[h]chromen-2-one and 4 amino-7,8,9,10-tetrahydro-2H-benzo[h]chromen-2-one analogues with improved water solubility. J. Nat. Prod. 75,370–377 (2012).Crossref, Medline, CAS, Google Scholar; 72 Wang X, Bastow KF, Sun CM et al. Antitumor Agents. 239. Isolation ...

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Heat sensitive recording composition containing a ...

2-amino-1-butanol 155-62" aminoethylenethanolamine 74-85 ... (benzo (f) chromene) 2/1 1.9 blue (g) 6'-chloro-8'-methoxybenzoindolino spiropyran 2/1 2.4 blue (h) ... Color developed very early during ball-milling and the mix was a deep blue-grey after 8 hours grinding. This grind was useless in the preparation of a thermo-sensitive coated paper.

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WO2015077177A1 - Method of forming a photochromic ...

A method of forming a photochromic segmented multifocal lens is described. The method involves, forming a segmented multifocal lens blank by molding, in which the segmented multifocal lens blank has a front surface and a rear surface. The front surface of the segmented multifocal lens blank includes a segmented optical power addition portion.

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Benzothiazole synthesis - Organic Chemistry

A Regel-type transition-metal-free direct C-2 aroylation of (benzo)oxazoles, (benzo)thiazoles and 1,3,4-oxadiazoles with acid chlorides is catalyzed by N,N-dimethyl-4-aminopyridine (DMAP) and affords the corresponding 2-keto­azoles in good yields. P. Lassalas, F. Marsais, C. Hoarau, Synlett, 2013, 24, 2233-2240. A simple and straightforward ...

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Copying systems, a process for their production, and ...

The invention relates to a pressure-sensitive, carbonless copying system and to a process for the production of pressure-sensitive, carbonless copying system wherein a non-aqueous, substantially solvent free ink containing micro-capsules which contain dye-precursors, is applied by wet and dry offset and book techniques to all or part of at least one surface …

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(PDF) Silica-Grafted Ionic Liquids as Recyclable Catalysts ...

Dihydropyrano[2,3-c]pyrazoles 2-Amino-4-(4-nitrophenyl)-4,5-dihydro-5-oxopyran To a mixture of aromatic aldehyde (1 mmol), malonitrile o[3,2-c]chromene-3-carbonitrile (1g): mp 259˚C - (1 mmol), and 3-methyl-1-phenyl-1H-pyrazol-5(4 H)-one 261˚C, (Lit.: 258˚C - 260˚C, [24]). 1H NMR (400 MHz, (1 mmol), catalyst [Sipim]HSO4 (0.15 g, 0.12 mmol ...

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e ploded view of 425 simmons cone crusher

amino benzo f chromene ball mill method; electrical equipment used in mining; and washing plant in south africa; ball mill and magnetic separator machine; butterfly table top grinder models and prices in chennai; 200 250tph stone crushing plant in africa; heat resistant rubber sheet thin rubber sheet; copper classifier type wtjc 123 pdf jakarta

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Synthesis, reactions and antimicrobial activities of 8 ...

Synthesis of 2-(2-(4-methoxyphenyl)hydrazono)-2-(4-(8-ethoxycoumarin-3-yl)thiazol-2-yl)acetonitrile hydrobromide (28). Method A: To a solution of compound 20c (10 mmol) in methanol (20 mL), a combination of 4-methoxyaniline (10 mmol), hydrochloric acid (5 mL) and sodium nitrite (10 mmol) in glacial acetic acid (20 mL) at 0 °C was added ...

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4-Aminobenzonitrile | C7H6N2 - PubChem

Computed by PubChem 2.1 (PubChem release 2021.05.07) XLogP3: 1.3: Computed by XLogP3 3.0 (PubChem release 2021.05.07) Hydrogen Bond Donor Count: 1: Computed by Cactvs 3.4.8.18 (PubChem release 2021.05.07) Hydrogen Bond Acceptor Count: 2: Computed by Cactvs 3.4.8.18 (PubChem release 2021.05.07) Rotatable Bond Count: 0

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Ball milling for the quantitative and specific solvent ...

Ball milling for the quantitative and specific solvent-free Knoevenagel condensation + Michael addition cascade in the synthesis of various 2-amino-4-aryl-3-cyano-4 H-chromenes without heating†. Omid Hosseinchi Qareaghaj a, Sara Mashkouri a, M. Reza Naimi-Jamal * a and Gerd Kaupp b a Research Laboratory of Green Organic Synthesis and Polymers, Department of …

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Three-Component Synthesis of 2-Amino-3-cyano-4H-chromenes ...

Chromenes are compounds that may be useful for inhibiting topoisomerase and cytochrome, enzymes involved in the growth of cancer and fungal cells, respectively. The aim of this study was to synthesize a series of some novel 2-amino-3-cyano-4-aryl-6,7-methylendioxy-4H-chromenes 4a–o and 2-amino-3-cyano-5,7-dimethoxy-4-aryl-4H-chromenes 6a–h by a three-component …

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Synthesis, biological assessment, and molecular modeling ...

The synthesis, pharmacological analysis and molecular modeling of the readily available racemic tacrine analogs 21–30, bearing the 7-aryl-9,10,11,12-tetrahydro-7H-benzo[7,8]chromeno[2,3-b]quinolin-8-amine heterocyclic ring system (II), prepared by Friedländer reaction of 2-amino-4-aryl-4H-benzo[h]chromene-3-carbonitriles (11–20) with …

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Microwave Assisted One‐pot Synthesis of 2‐Amino‐4H ...

A convenient and efficient method using microwave assisted one pot synthesis reactions for synthesis of 4H-benzo[f]chromenes by the reaction of …

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Pentafluoropropionic Acid: An Efficient and Metal-Free ...

Pentafluoropropionic acid (PFPA) efficiently catalyzes the one-pot, three-component reaction of aromatic aldehyde, malononitrile, and dimedone to yield tetrahydrobenzo[b]pyran derivatives in high yields. This method is of great value because of its easy processing, short reaction time, environmentally, and high yields.

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Growing Science

Maleki, A., Azadegan, S. Preparation and characterization of silica-supported magnetic nanocatalyst and application in the synthesis of 2-amino-4H-chromene-3-carbonitrile derivatives (2017) Inorganic and Nano-Metal Chemistry, 47 (6), pp. 917-924.

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Green Chemistry: New Synthesis of Substituted …

12%The IR spectra of the target compounds 3 revealed the presence of the two characteristic amino and cyano absorption bands of 2-amino-4H-benzo[h]chromene-3-carbonitrile moieties at υ 3477–3457, 3334–3320, 3200–3188 cm −1 and at υ 2199–2195 cm −1 respectively. On the other hand, the 1 H NMR spectra of 3a, b, d–h, j …

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Synthesis, in-vitro cytotoxicity of 4H-benzo[h]chromene ...

A series of 2-amino-4H-benzo[h]chromene and 2,7-diamino-4H-benzo[h]chromene derivatives were prepared as potential cytotoxic agents. The structures of the synthesised compounds were established on the basis of spectral data. The in-vitro cytotoxic activity of the synthesised compounds against the cell lines MCF-7, HCT-116 and HepG-2 was …

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A simple and fast protocol for the synthesis of 2-amino-4 ...

In this study, a novel optical immunoassay platform was developed by using an optical probe 2-amino-4-(4-formylphenyl)-4H-chromene-3-carbonitrile (AFC), which was synthesized via greener Ultra-sonication method. The structure of …

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A facile and green three-component synthesis of 2-amino …

A simple, efficient and one-pot method has been developed for the synthesis of densely functionalized aryl derivatives of 2-amino-3-cyano-7-hydroxy-4H- chromene by the domino...