5453-03-2Relevant articles and documents
Kinetics and mechanism of certain benzoylation reactions under Vilsmeier-Haack conditions using benzamide and oxychloride in acetonitrile medium
Rajanna,Venkateswarlu,Satish Kumar,Umesh Kumar,Venkateshwarlu,Saiprakash
, p. 69 - 80 (2013)
Vilsmeier-Haack (VH) benzoylation reactions with benzaldehydes and acetophenones in acetonitrile medium obeyed second-order reaction kinetics. Under kinetic conditions, the reactions afforded benzoyl derivatives irrespective of the nature of oxychloride (
New syntheses of 3-aroylflavone derivatives; Knoevenagel condensation and oxidation versus one-pot synthesis
Vaz, Patrícia A. A. M.,Pinto, Diana C. G. A.,Rocha, Djenisa H. A.,Silva, Artur M. S.,Cavaleiro, José A. S.
, p. 2353 - 2356 (2013/07/19)
Two syntheses of 3-aroylflavones have been established. In the first synthesis the use of microwave irradiation led to an improvement in the yields of both the Knoevenagel condensation of β-diketones with aldehydes to afford 3-aroylflavanones and of their
A concise synthesis of 3-aroylflavones via Lewis base 9-azajulolidine- catalyzed tandem acyl transfer-cyclization
Yoshida, Masahito,Saito, Koya,Fujino, Yuta,Doi, Takayuki
, p. 11796 - 11798,3 (2020/10/15)
Lewis base-catalyzed tandem acyl transfer-cyclization of acylated o-alkynoylphenols leading to 3-aroylflavones was developed. 9-Azajulolidine smoothly promoted the reaction of the aroyl derivatives at ambient temperature, and the structure-diversed synthesis of 3-aroylflavones with distinct substituents was achieved in moderate to excellent yields.
An efficient one-pot synthesis of flavones
Chee, Chin Fei,Buckle, Michael J.C.,Rahman, Noorsaadah Abd.
scheme or table, p. 3120 - 3123 (2011/06/26)
Flavones were prepared using a one-pot procedure starting from the corresponding 2′-hydroxyacetophenones. The latter were treated with 3 equiv of aroyl chloride in wet K2CO3/acetone (1% w/w water) to afford a good yield of flavone and a smaller amount of 3-aroylflavone. Evidence was obtained that the reaction proceeds via a triketone intermediate. When the reactants were heated in 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and pyridine, the 3-aroylflavone was obtained exclusively. Use of a stoichiometric amount of aroyl chloride afforded only the corresponding flavone.
Synthesis and properties of 3-acyl-γ-pyrones, a novel class of flavones and chromones
Ganguly,Kaur,Mahata,Biswas,Pramanik,Chan
, p. 4119 - 4121 (2007/10/03)
Using modified Baker-Venkataraman reaction a novel class of 3-acyl flavones and chromones have been synthesised. Reaction mechanism for their formation have been elucidated. The properties of 3-acyl flavonoids indicate them to be precursors for the synthesis of flavones.
A simple conversion of E-3-benzylideneflavanones to 3-benzoylflavones by chromic acid oxidation
Mallik, Asok K.,Chattopadhyay, Falguni
, p. 1947 - 1949 (2007/10/03)
Oxidation of E-3-benzylideneflavanones with CrO3/AcOH yields 3-benzoylflavones in moderate yield.
Synthesis of flavone-3-sulfonylureas
Loewe, Werner,Matzanke, Norbert
, p. 943 - 948 (2007/10/03)
The synthesis of new flavone-3-sulfonylurea derivatives is hereby described. The influence of a phenyl group in the 2-position and an acetate group in the 8-position at the chromone nucleus on the activity was studied. Only weak cytostatic activity of the
Synthesis of 3-Acyl- and 3-Carbamoylflavones
Ellemose, Steen,Kure, Niels,Torsell, Kurt B. G.
, p. 524 - 529 (2007/10/02)
Routes to 3-acyl-, 3-carboxamido- and polyhydroxylated flavones have been devised by application of isoxazole methodology and Heck-Stille couplings.Reductive ring opening of 3-alkoxyisoxazoles gives β-keto carboxamides in contrast with 3-alkoxy-2-isoxazolines, which give β-hydroxy esters.
Dioxirane Oxidation of 3-Arylideneflavanones: Diastereoselective Formation of trans,trans Spiroepoxides from the E Isomers
Nemes, Csaba,Levai, Albert,Patonay, Tamas,Toth, Gabor,Boros, Sandor,et al.
, p. 900 - 905 (2007/10/02)
Oxidation of the E isomers of the 3-arylideneflavanones 1 by dimethyldioxirane in acetone solution at ambient temperature led to spiroepoxides trans,trans-2 in high yields (>/= 70percent) and complete diastereoselectivity.Steric interaction with the axial
Control of oxophilicity of cerium(IV) ammonium nitrate by addition of hydrogen peroxide. A novel preparation of 3-aroyl-2-aryl-4H-1-benzopyran-4-ones
Chawla, H. M.,Sharma, S. K.
, p. 656 - 659 (2007/10/02)
Oxophilicity of cerium(IV) ammonium nitrate (CAN) can be controlled by addition of hydrogen peroxide and such a control has been utilized to prepare 3-aroyl-2-aryl-4H-1-benzopyran-4-ones 2a-d from 3-arylidene-2-aryl-2,3-dihydro-4H-1-benzopyran-4-ones 1a-d