33064-23-2Relevant academic research and scientific papers
Ultrasound assisted synthesis of 1,5-disubstituted pyrazole using Cu(I) catalyst
Pise, Ashok S.,Burungale, Arvind S.,Devkate, Santosh S.
, p. 575 - 579 (2020/02/06)
A new efficient and convenient approach towards the synthesis of pyrazole is described. The α,β-unsaturated cyanoesters were obtained from substituted benzaldehyde and ethyl cyanoacetate by reported methods. 1,5-Disubstituted pyrazoles were synthesized fr
Molybdenum-Mediated One-Pot Synthesis of Pyrazoles from Isoxazoles
Beaumont, Stéphane,Rey, Marine
, p. 3796 - 3804 (2019/10/11)
A one-pot approach for the direct synthesis of substituted pyrazoles from isoxazoles is reported. The process involves isoxazole N-O bond cleavage mediated by a molybdenum complex, in situ hydrolysis of the resulting β-amino enone to the corresponding 1,3-diketone, followed by pyrazole formation in the presence of hydrazine or substituted hydrazine. Good to excellent yields and regioselectivities are obtained with nonsymmetric isoxazoles. By using readily available starting materials, a wide range of substituted pyrazoles may be synthesized by this method.
Regioselective microwave-assisted synthesis of substituted pyrazoles from ethynyl ketones
Bagley, Mark C.,Lubinu, M. Caterina,Mason, Christopher
, p. 704 - 708 (2007/12/27)
Reaction of α,β-ethynyl ketones and hydrazine derivatives gives 1,3- and 1,5-disubstituted pyrazoles in good yield. Microwave irradiation in concentrated hydrochloric acid-methanol (1.5% v/v), with concurrent cooling at sub-ambient temperatures or at 120°
New Synthesis of Pyrazole and Isoxazole Derivatives
Molina, P.,Fresneda, P. M.
, p. 461 - 464 (2007/10/02)
A convenient synthesis of 5-aryl-1-phenylpyrazoles and 5-arylisoxazoles, from readily available ketimine 1 dimethylformamide dimethylacetal and phenylhydrazine or hydroxylamine, is described.
