- One pot synthesis of 4-(2-hydroxybenzoyl)-pyrazoles from 3- formylchromones under microwave irradiation in solvent free conditions
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The synthesis of 4-(2-hydroxybenzoyl)pyrazoles (3) was achieved in a single step by the reaction of 3-formylchromones (1) with Phenylhydrazine or Tosylhydrazine under microwave irradiation without a solvent.
- Sabitha, Gowravaram,Satheesh Babu,Yadav
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- Synthesis and anti-proliferative activity of 4H-chromone based phenylhydrazones, pyrazolecarboxylates and pyrazolylmethanones
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Series of 4H-chromone-based hydrazones 3a-z, pyrazolecarboxylates 5a-x and pyrazolylmethanones 6a-u were prepared and screened for their anti-proliferative activity on A549, HeLa, DU145 and MDAMB 231 cell lines. The hydrazone compound 3s with a chloro sub
- Rayala, Nageswara Rao,Kommera, Rajkumar,Cherupally, Dayakar,Thampunuri, Ramalinga Murthy,Shasi, V. Kalivendi,Bhimapaka, China Raju
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- In vitro cytotoxicity of hydrazones, pyrazoles, pyrazolo-pyrimidines, and pyrazolo-pyridine synthesized from 6-substituted 3-formylchromones
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Pyrazoles 4a-f, hydrazones 5a-c and 6a-c, pyrazolo[1,5-a]pyrimidines 7a, b, and pyrazolo[3,4-b]pyridine 8 were prepared in good yields (80-95%) from the reaction of 6-substituted (H, Me, F) 3-formylchromones 1a-c with N-substituted hydrazines 2a-c and ami
- Galarraga, Elier,Urdaneta, Neudo,Gutierrez, Keily J.,Herrera, Julio C.
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p. 305 - 310
(2015/05/20)
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- Studies on the chemical transformations of simple condensates derived from 3-formylchromone under nucleophilic conditions
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The chemical reactivity of the simple condensates 1 and 2, derived from 3-formylchromone, was studied towards some nucleophilic reactions. Reactions of compounds 1 and 2 with some nucleophilic reagents mainly proceed via nucleophilic addition at the exocy
- Ibrahim, Magdy A.,El-Gohary, Nasser M.
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p. 413 - 425
(2014/03/21)
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- Benzopyrans: Part XXIX - Reactions of some simple condensates of 4-oxo-4H-1-benzopyran-3-carboxaldehyde with nitrogen nucleophiles
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The chromone 2, derived from the title aldehyde 1, gives the pyrazole 8 (R3 = Ph) with phenylhydrazine whereas 5 gives with H2NNHR3 (R3 =H and Ph) the pyridine derivatives (9).Hydroxylamine converts the chromones 2-4 into pyridine-1-oxides (13-15), respectively.The reaction of 1 with ethyl glycinate in the presence of pyridine affords the pyrroles 20 and 21, the former (20) being detected in the product mixture derived from 4 and ethyl glycinate.
- Ghosh, Chandra Kanta,Sahana, Sirin,Bandyopadhyay, Chandrakanta
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p. 624 - 629
(2007/10/02)
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- Synthesis and evaluation of potential pharmacophores derived from 4-oxo-4H-1-benzopyran-3-carboxaldehyde
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The preparation of hydrazone derivatives of 4-oxo-4H-1-benzopyran-3-carboxaldehyde (2a-c, 4a-c, 5, 6a,b), 3-aryl-1-(benzopyran-4-one-3-yl)-propen-3-one (8a-c), ethyl 2-cyano-3-(benzopyran-4-one-3-yl)acrylate (10) and thioacetal derivatives of 4-oxo-4H-1-b
- Coutinho, Dionysia L M,Fernandes, Peter S
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p. 573 - 577
(2007/10/02)
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- Heterocyclic Systems: Part XIII - Reactions of 3-N,N-Dimethylhydrazonomethyl-, Oximomethyl- and Cyano-chromones with Nucleophiles Containing Nitrogen
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Reactions of the title chromones (3, 9, 10) with nitrogen containing nucleophiles (5-7) have been studied.When treated with phenylhydrazine, the hydrazone (9) produces the same pyrazole 17 (R'=Ph) as obtained by reacting chromone-3-carboxaldehyde (8) with
- Ghosh, Chandra Kanta,Tewari, Nimai,Bandyopadhyay, Chandrakanta
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p. 1200 - 1204
(2007/10/02)
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- Hetericyclic Systems. Part 14. Condensation Reactions of 2-(4-Oxo-4H-1-benzopyran-3-yl)-1,3-dioxolane
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Nitrogen nucleophiles under 1,4-addition with the title acetal (4; R=H, Me, and Cl) to give an intermediate that ultimately produces in most cases the same product as is obtained from the corresponding aldehyde (3) under similar conditions.Thus, compound
- Ghosh, Chandra Kanta,Bandyopadhyay, Chandrakanta,Morin, Christophe
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p. 1989 - 1994
(2007/10/02)
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