Silica-bonded DABCO hydrogen sulfate ((SB-DABCO)HSO4): a new dual-interphase catalyst for the diversity-oriented pseudo-five-component synthesis of bis(pyrazolyl)methanes and novel 4-[bis(pyrazolyl)methane]phenylmethylene-bis(indole)s
and was successfully applied for the diversity-oriented synthesis of bis(pyrazolyl)methanes via a one-potpseudo-five-component condensation reaction. This approach provides a versatile range of available substrates and high diversity of desired products. Moreover, ((SB-DABCO)HSO4) was successfully applied for the synthesis of some novel [bis(pyrazolyl)methane]-bis(indole)s as more complex molecules
PEG-SO3H as a new, highly efficient and homogeneous polymeric catalyst for the synthesis of bis(indolyl)methanes and 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1Hpyrazol-5-ol)s in water
作者:A. Hasaninejad、M. Shekouhy、A. Zare、S. M. S. Hoseini Ghattali、N. Golzar
DOI:10.1007/bf03249075
日期:2011.6
In this work, a green, simple and highly efficient procedure for the synthesis of bis(indolyl)methanes and 4,4'-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s [as an important class of bis(pyrazolyl) methanes] is described. The condensation of indoles or 1-phenyl-3-methylpyrazol-5-one with carbonyl compounds catalyzed by poly(ethylene glycol)-bound sulfonic acid (PEG-SO3H) in water affords the title compounds in high yields and relatively short reaction times.
Design, characterization and application of new ionic liquid 1-sulfopyridinium chloride as an efficient catalyst for tandem Knoevenagel–Michael reaction of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one with aldehydes
作者:Ahmad Reza Moosavi-Zare、Mohammad Ali Zolfigol、Mahmoud Zarei、Abdolkarim Zare、Vahid Khakyzadeh、Alireza Hasaninejad
DOI:10.1016/j.apcata.2013.07.004
日期:2013.10
In this work, novel ionic liquid 1-sulfopyridinium chloride [Pyridine-SO3H]Cl} is synthesized, and characterized by IR, H-1 and C-13 NMR, UV as well as mass spectra. The ionic liquid is used as an efficient, homogeneous and reusable catalyst for the synthesis of 4,4'-(arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s by tandem Knoevenagel-Michael reaction of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one with various aromatic and hetero-aromatic aldehydes under mild reaction conditions. (C) 2013 Elsevier B.V. All rights reserved.
Rapid cesium fluoride-catalyzed Knoevenagel condensation for the synthesis of highly functionalized 4,4′-(arylmethylene)bis(1H-pyrazol-5-ol) derivatives
作者:Khalid Mohammed Khan、Munira Taj Muhammad、Imran Khan、Shahnaz Perveen、Wolfgang Voelter
DOI:10.1007/s00706-015-1424-9
日期:2015.9
A rapid, convenient, and environmentally friendly protocol was developed for the synthesis of functionalized 4,4'-(arylmethylene)bis(1H-pyrazol-5-ols) via a tandem Knoevenagel-Michael reaction by condensing pyrazolone with readily available differently substituted aldehydes and catalyzed by cesium fluoride at room temperature.