1015862-36-8Relevant articles and documents
Synthesis of pyrazole-carboxamides and pyrazole-carboxylic acids derivatives: Simple methods to access powerful building blocks
Dos Santos, Maurício Silva,Ferreira, Byanca Silva,Silva, Rafaela Corrêa,Souto, Bernardo Araújo
, p. 335 - 343 (2021/09/07)
Hybrid systems containing pyrazole moiety show a wide spectrum of biological activities. To access novel hybrids with pyrazole ring, in this work we synthesized twenty pyrazole-carboxylic acids and twenty pyrazole-carboxamides, using simple synthetic methods, to be used as building blocks in the development of new structures.
Flow hydrodediazoniation of aromatic heterocycles
R?der, Liesa,Nicholls, Alexander J.,Baxendale, Ian R.
, (2019/06/05)
Continuous flow processing was applied for the rapid replacement of an aromatic amino group with a hydride. The approach was applied to a range of aromatic heterocycles, confirming the wide scope and substituent-tolerance of the processes. Flow equipment was utilized and the process optimised to overcome the problematically-unstable intermediates that have restricted yields in previous studies relying on batch procedures. Various common organic solvents were investigated as potential hydride sources. The approach has allowed key structures, such as amino-pyrazoles and aminopyridines, to be deaminated in good yield using a purely organic-soluble system.
An efficient synthesis of new 5-(1-Aryl-1H-pyrazole-4-yl)-1H-tetrazoles from 1-Aryl-1H-pyrazole-4-carbonitriles via [3 + 2] cycloaddition reaction
Dos Santos, Mauricio S.,Bernardino, Alice M. R.,Pinheiro, Luiz C. S.,Canto-Cavalheiro, Marilene M.,Leon, Leonor L.
, p. 1425 - 1428 (2013/02/23)
A series of new 5-(1-aryl-1H-pyrazole-4-yl)-1H-tetrazoles 4a-l were synthesized via [3 + 2] cycloaddition reaction from 1-aryl-1H-pyrazole-4- carbonitriles 3a-l, sodium azide and ammonium chloride, using dimethylformamide (DMF) as solvent, in good yields: 64-85%. The structures of these newly synthesized compounds were determined from the IR, 1H- and 13C-NMR spectroscopic data and elemental analyses.