- Amino Benzo F Chromene Grinding Method
Amino Benzo F Chromene Grinding Method
A convenient and efficient one-pot method for the synthesis of 2-amino-tetrahydro-4H-chromene and 2-amino-4H-benzo[h]-chromene derivatives has been developed using a catalytic amount of amino-functionalized MCM-41 in aqueous medium.This efficient technique has the advantages of giving 4H-tetrahydro-chromene and 4H-benzo[h]chromene building blocks using a reusable catalyst in good to …
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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 aromatic aldehydes with a mixture of malononitrile and ...Read More
Synthesis, Characterization, Biological Activity Of Novel ...
Methods: 3-Amino-1-(4-chlorophenyl)-9-hydroxy-1H-benzo[f]chromene-2-carbonitrile (3) was used as precursor for the synthesis of novel 1H-benzo[f]chromene (4,8-11) and 12Hbenzo[ f]chromeno[2,3-d]pyrimidine (5-7,12-14) derivatives via reaction of compounds 3 with appropriate chemical reagents. The structures of the synthesized compounds were ...Read More
Diastereodivergent Synthesis Of Hexahydro
interest latterly, and several organocatalytic methods have been developed for the efficient assembly of such tricyclic skeleton. However, to our knowledge, there is no method that can achieve the catalytic diastereodivergent synthesis of hexahydro -6H benzo[c]chromene derivatives. Figure 1.Read More
A Carbon Quantum Dot
Oct 01, 2017· A carbon-quantum dot encapsulated micellar reactor was developed for the synthesis of 4H-chromene derivatives. • The present method provides metal-free and aqueous conditions. ... -Amino-1-phenyl-1H-benzo[f]chromene-2-carbonitrile (13) Mp = 297–299 °C; 1 H NMR ...Read More
Green And Mechanochemical One
The reaction was simply achieved by grinding of various substituted aromatic aldehydes, dimedone, and malononitrile at room ... drome.14,15 4H-benzo[b]pyran or chromene scaﬀold is found in several drugs that are pharmacologically active, for example, ... General Method for Synthesis of 2-Amino-4H-benzo-pyrans (4a−4p). Using the optimized ...Read More
Green Chemistry: New Synthesis Of Substituted Chromenes ...
Abstract. Substituted 2-amino-4-aryl-7-hydroxy-4H-chromene-3-carbonitriles (6), 2-amino-4-aryl-4H-benzo[h]chromene-3-carbonitriles (7), and 3-amino-1-aryl-1H-benzo[f]chromenes-2-carbonitriles (8) were prepared, in good yields, via one-pot three-component reactions of aromatic aldehydes (1), malononitrile (2), and resorcinol (3) or α-naphthol (4) or β-naphthol (5) in refluxing ethanol or ...Read More
An Efficient, Multicomponent Approach For Solvent
Method: The reaction of 3-amino-1-(substitutedphenyl)-1H-benzo[f]chromene-2-carbonitrile with sodium azide, ammonium chloride in dimethyl formamide solvent under reflux condition for 4 h afforded ...Read More
Synthesis, Molecular Docking Study And In Vitro Anticancer ...
METHOD: The reaction of 3-amino-1-(substitutedphenyl)-1H-benzo[f]chromene-2-carbonitrile with sodium azide, ammonium chloride in dimethyl formamide solvent under reflux condition for …Read More
Abstract: A synthesis of 2-amino-4-(R)-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile derivatives (4a-l) in single flasks containing aromatic aldehydes (1a-l), malononitrile (2), and dimedone (3) by using green catalyst, extract of orange without solvent under ultrasound irradiations and reflux condition.Synthesis of 2-amino-4-(R)-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H ...Read More
Synthesis Of 2
ing method to construct the 2-amino-4H-chromene skeleton. 2. Experimental 2.1 Materials and methods Solvents used were of analytical grade. All melt-ing points were taken in open capillaries and are uncorrected. Thin-layer chromatography (TLC, on alu-minium plates precoated with silica gel, 60F254, 0.25mm thickness) (Merck, Darmstadt, Germany) wasRead More
Using Sodium Hydride And Potassium Carbonate As Bases In ...
Materials and Methods: The use of CTAB for the synthesis of benzylidene malononitriles and anhydrous potassium carbonate as a catalyst in absolute ethanol in the synthesis of 2-amino-7-hydroxy-4H-chromene-3- carbonitriles is an efficient and simple synthetic method.Read More
Synthesis Of Novel Benzo( F )Chromene Compounds …
Apr 01, 2012· Abstract. A facile method for the synthesis of benzo[f]chromene derivatives is reported. The procedure involves a novel three-component reaction of 1-naphthol or 2-naphthol, acetophenone derivatives and triethyl orthobenzoate in the presence of silica supported ionic liquid [pmim]HSO4 SiO2 [silica supported 1-methyl-3-(triethoxysilylpropyl)imidazolium hydrogensulfate] as an efï¬ cient catalyst.Read More
A Green And One
The synthesis of benzo[g]chromene derivatives through a multi-component reaction catalyzed by lipase is reported for the first time. This novel efficient method has the advantages of environmental friendliness, high yield and simple work-up. Moreover, this protocol extends the …Read More
Synthesis, Molecular Docking Study And In Vitro Anticancer ...
Method: The reaction of 3-amino-1-(substitutedphenyl)-1H-benzo[f]chromene-2-carbonitrile with sodium azide, ammonium chloride in dimethyl formamide solvent under reflux condition for 4 h afforded products (3a-k). The synthesized molecules were subjected to possible potential anti-tumour activity in vitro in four human cancer cell lines (MCF-7 ...Read More
Design And Synthesis Of Benzothiazole/Thiophene
spectrometer.Melting points were determined by open glass capillary method and were uncorrected. 4. General procedure for synthesis of 5-(2-amino-3-(benzo[d]thiazol-2-yl)-4H-chromen-4-yl)-2-thioxoimidazolidin-4-one derivatives. To a stirred solution of ethanol were added aRead More
Synthesis And Properties Of 3
4H-benzo[h]chromene Fawzia F. Alblewi et al-Synthesis and antiproliferative activity of new 2-glyco-3-nitro-2H-chromenes Verónica Luque-Agudo et al-This content was downloaded from IP address 184.108.40.206 on 02/08/2019 at 02:47Read More
Synthesis, Crystal Structures, And Laser Flash Photolysis ...
Synthesis of 8-nitrospiro[benzo[f]chromene-3,2′-indoles]. The condensation of 1-substituted imidazo[1,2-a]indolones 4a-d with 2-hydroxy-6-nitro-1-naphthaldehyde was carried out in acetic acid. Work-up of the reaction mixture with sodium acetate afforded 8-nitrospiro[benzo[f]chromene-3,2′-indoles] 5a …Read More
Preparation And Characterization Of A Molybdenum(Vi ...
method of synthesis. For the synthesis of 2-amino-4H-benzo[h]chromenes, different methods were reported [41-44]. Although these methods are efficient, but many of them require expensive catalyst, difficult workup and toxic organic solvents [45-48]. Therefore, considering the pharmacologically and biologically importance of chromenes, attemptRead More
Organocatalytic Clean Synthesis Of Densely Functionalized ...
Table 2. Three-component synthesis of different 2-amino-5,10-dihydro-5,10-dioxo-4H-benzo[g]chromene-3-carbonitrile derivatives (9a–j) via condensation of 2-hydroxynaphthalene-1,4-dione (6), various aldehydes 7a-j and malononitrile (8) in the presence of TEACB (5) using ball milling technique at ambient temperature.aRead More
pyrimidines, benzo-chromenepyrimidotriazepine and antimicrobial activities. Ibrahim Ali Radini, Hany Mostafa Hamed, Mohammed Abdo Yahya Kharir and Ashraf Hassan Fekry Abd Elwahab. 8(3), 240‐247 European Journal of Chemistry 0.45 2017 ---8 Crystal structure of 3-amino-1-(4-bromophenyl)-9-methoxy-1H-benzo[f]chromene-2-carbonitrile, C 21 H 15Read More
Photochemical Synthesis Of Benzo[F]Chromene
This study illustrated the potential of photochemical synthesis of benzo[f]chromene. A simple procedure was proposed for the synthesis of a nano-SnO 2 /TiO 2 composite using the sol-gel method by hydrolysis of tin(iv) chloride and titanium(iv) chloride at room temperature in the presence of polyethylene glycol 200, diethanolamine, and distilled ...Read More
Studies On The Synthesis Of Substituted 2
The synthesis of several substituted 2-amino-4H-benzo[h]chromene and 3-amino-1H-benzo[f]chromene derivatives was carried out using a one-pot three-component reaction of an arylaldehyde, malononitrile and a naphthol in H 2 O and in the presence of recyclable base supported ionic liquid like-phase as an efficient green catalyst.Read More
Preparation And Characterization Of A Molybdenum(Vi ...
A new recoverable molybdenum nanocatalyst was prepared by immobilization of a Schiff base ligand on the surface of silica coated magnetite nanoparticles (Fe 3 O 4 @SiO 2) through condensation reaction between 3-aminopropyl triethoxysilane and 2-hydroxy1-naphthaldehyde and succeeding reaction with dioxomolybdenum(VI) acetylacetonate (MoO2(acac)2).The synthesized catalyst was characterized by ...Read More
An Efficient Green Synthesis Of 3
2-amino-4H-chromenes,49,50 in this paper we introduce ZnO nanoparticles on a thin-film glass substrate by the mild hydro-thermal method and then used it for the first time as an efficient heterogeneous catalyst for the preparation of racemic 3-amino-1aryl-1H-benzo[f]chromene-2-carbonitriles (4) via a …Read More
A Review: Synthesis Schemes Of Antimicrobial …
1 (d). Method for the synthesis of tetrahydro benzo[b] thiophene derivative Moreover, the reaction of compound (3) with cyclohexanone (10) and elemental sulfur in the presence of triethylamine led to the formation of 4,5,6,7- tetrahydro benzo[b] thiophene derivative i.e. 2-Amino-Read More
A Facile And Efficient Synthesis Of New Pyrimido[4',5':4,5 ...
Sep 12, 2015· amino-1H-benzo[f]chromene-2-carbonitrile products in high yields. Table 2: Synthesis of the 3-amino-1H-benzo[f]chromene-2-carbonitriles 4a-i using the DMAP catalyst under the optimized conditions En try Ar Product Time (min) Isolated yield (%) Melting point (ºC) Found Reported [Lit.] 1 C 6 H 5 4a 45 85 287-289 287-288 (Gong et al., 2008) 2 4 ...Read More
Crystal Structure Of 2
4H-benzo[g] chromene-3-carbonitrile D. K. Sharma1, A. Jayashree2, B. Narayana2, B. K. Sarojini3, ... methods and refined by full-matrix least squares procedures to a final R value of 0.1199 for 2629 observed ... (for C12 atom of the chromene ring system). The amino and cyanide groups attached at …Read More
Ball Milling For The Quantitative And Specific Solvent ...
This now safely validates the angular -4 H-benzo[f]chromene structures of the products from the reactions with β-naphthol, independent of the reaction conditions and arylic substitution. Also, published X-ray diffraction analyses of related compounds ( 8a with H, 64 CH 3 , 65 or Br ( ref. 66 ) instead of Cl, the latter in the ( S ...Read More
Shanthi et al. reported the synthesis of 4H-chromene derivatives by hazardous InCl 3 catalyst at reﬂux in ace-tonitrile for 1.5 h. Therefore, there is still a demand for simple and facile methodologies for the preparation of spiro-chromene compounds with more efﬁciency and shorter reaction times. L-proline is an amino acid that is used in ...Read More
La présente invention concerne des dérivés de benzo[f]chromène spécifiques, photochromes, h-annelés et leur utilisation dans des matières plastiques de tous types, notamment à des fins ophtalmologiques. Cette invention concerne en particulier des composés photochromes dérivés de benzo[f]chromènes qui présentent dans leur forme ouverte des maxima d'absorption à longueur d'onde ...Read More
Synthesis Of Benzothiophene
Subsequently, Takaki’s research group was given an efficient synthetic strategy for 2-amino-4H-chromenes from photochemical generated o-quinone methides and malononitrile (Scheme 1(b)) .After that, Rao’s group also designed and synthesized a series of pyran derivatives in good yields by utilizing Baylis–Hillman chemistry (Scheme 1(c)) .For the past decades, there was a rapid ...Read More
The present invention relates to a novel chromene compound having favorable photochromic properties, developing a color of a high density, exhibiting a small degree of initial color and permitting the color to quickly fade. The novel chromene compound has an amino group that may be substituted for a sixth position of a naphthopiran ring, has electron-donating groups at para-positions of the ...Read More
Research Article Green Chemistry: New Synthesis Of ...
mm thick with F-indicator. Visualization was accomplished by UV light. Solvents for chromatography were reagent grad and used as received. Microanalyses were performed by the microanalytical Data Unit at Cairo University. General Procedure for the Synthesis of -Amino--aryl--hydroxy-H-chromene--carbonitriles a h. Method (A) .Read More
Dihydropyrancarboxamides Related To Zanamivir: A New ...
4-Amino- and 4-guanidino-4H-pyran-6-carboxamides 4 and 5 related to zanamivir (GG167) are a new class of inhibitors of influenza virus sialidases. Structure−activity studies reveal that, in general, secondary amides are weak inhibitors of both influenza A and B viral sialidases. However, tertiary amides, which contain one or more small alkyl groups, show much greater inhibitory activity ...Read More
A Facile And Green Three
A simple, e cient 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 Knoevenagel-Michael-cyclization reactions of aromatic aldehydes, resorcinol and malononitrile in the presence of a catalytic amount of Na2CO3 under grinding conditions.Read More
Synthesis, Characterization And In
The versatile use of benzo-chromenes has stimulated a considerable interest to explore the possible synthesis of novel fused compounds in which the benzo-chromene ring is fused with another biologically active molecule. An attempt was made to utilize this concept, that is the fusion of benzo-chromene …Read More
Synthesis, Fluorescence Properties, And Antiproliferative ...
Molecules 2015, 20 18567 the key intermediate 3-oxo-3H-benzo[f]chromene-2-carboxylic acid (3) via Knoevenagel condensation of 2-hydroxy-1-naphthaldehyde (1) with Meldrum’s acid (2).For the first step, cheap ethanol was selected as the solvent and pyridine as a catalyst.Read More
Synthesis Of Novel Benzo[F]Chromene Compounds Catalyzed …
A facile method for the synthesis of benzo[f]chromene derivatives is reported. The procedure involves a novel three-component reaction of 1-naphthol or 2-naphthol, acetophenone derivatives and ...Read More
Synthesis Of 2
Request PDF | Synthesis of 2-aminochromene derivatives catalyzed by KF/Al 2O3 | A series of 2-aminochromene derivatives including 2-amino-benzo [h] chromene, 2-amino-benzo [f] chromene …Read More
Synthesis And Biological Evaluation Of 3
Objective: The study aims to synthesize new chromene derivatives via a new approach using Grignard reagents, for the evaluation of their antibiotic and antifungal properties. Method: A series of novel 3-cyano-4-aminochromene derivatives bearing alkyl substituents at the 4-position was prepared for biological evaluation.Read More
Synthesis Of Ethyl
new method for the synthesis of chromene derivatives using DMAP as catalyst and co-solvent (additive), as a rapid convenient method with suitable yields. The point is which lead to higher purity ... Ethyl 3-amino-1-p-tolyl-1H-benzo[f]chromene-2-carboxylate (5f).Read More
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