Synthesis of 4,4′-(arylmethylene)bis(3-carboxymethyl-1-phenyl-1<i>H</i>-pyrazol-5-ol)s using ionic liquid attached to colloidal silica nanoparticles in water
作者:Hossein Shahbazi-Alavi、Javad Safaei-Ghomi、Samane Esmaili、Seyed Hadi Nazemzadeh
DOI:10.3184/174751917x15000317104529
日期:2017.8
An efficientsynthesis of 10 4,4′-(arylmethylene)bis(3-carboxymethyl-1-phenyl-1H-pyrazol-5-ol)s, eight of which are novel, was achieved by a one-pot three-component reaction of phenylhydrazine, dimethyl acetylenedicarboxylate and an arylaldehyde using bis(1(3-methoxysilylpropyl)-3-methyl-imidazolium) copper tetrachloride tethered to colloidal silica nanoparticles as catalyst undermicrowave irradiation
Multicomponent domino reactions of acetylenedicarboxylates: divergent synthesis of multi-functionalized pyrazolones and C-tethered bispyrazol-5-ols
作者:Xing-Chao Tu、Hui Feng、Man-Su Tu、Bo Jiang、Shu-Liang Wang、Shu-Jiang Tu
DOI:10.1016/j.tetlet.2012.04.051
日期:2012.6
An efficient and practical methodology of selectively divergent synthesis of arylidene pyrazolones and C-tethered bispyrazol-5-ols via multicomponent domino reactions of acetylenedicarboxylates, phenylhydrazine and aromatic aldehydes has been developed. The electron-donating aryl groups (EDAG)-attached aldehydes resulted in the pyrazolone skeleton, whereas the electron-withdrawing aryl groups (EWAG) led to the C-tethered bispyrazol-5-ols with simultaneous formation of two new pyrazole rings. (C) 2012 Elsevier Ltd. All rights reserved.