Multicomponent reactions of 1,3-disubstituted 5-pyrazolones and formaldehyde in environmentally benign solvent systems and their variations with more fundamental substrates
作者:Jia-Neng Tan、Minghao Li、Yanlong Gu
DOI:10.1039/b924699a
日期:——
Many multicomponentreactions (MCRs) of 1,3-disubstituted 5-pyrazolones and formaldehyde were developed in environmentally benign solvent systems. Styrenes, vinylferrocene and 2-phenylindoles could easily react, under solvent-free conditions or in glycerol solvent, with 1,3-disubstituted 5-pyrazolones and paraformaldehyde in the absence of any catalyst to afford a variety of complex skeletons in moderate
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.
Reaction of Aldehydes and Pyrazolones in the Presence of Sodium Dodecyl Sulfate in Aqueous Media
作者:Wei Wang、Shu‐Xiang Wang、Xin‐Ying Qin、Ji‐Tai Li
DOI:10.1081/scc-200054854
日期:2005.5
The environmentally friendly condensation 3-methyl-1-phenyl-5-pyrazolone or 3-methyl-1H-5-pyrazolone with aromatic and aliphatic aldehydes was performed in water at refluxing temperature for 1 h using sodium dodecyl sulfate (SDS) as the surfactant catalyst (5 mol%), giving 4,4'-alkylmethylene-bis(3-methyl-5-pyrazolones) in 78.3%similar to 92.1% yields.